CN201918634U - Multi-optical path sheet type laser oscillator - Google Patents
Multi-optical path sheet type laser oscillator Download PDFInfo
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- CN201918634U CN201918634U CN2010206073465U CN201020607346U CN201918634U CN 201918634 U CN201918634 U CN 201918634U CN 2010206073465 U CN2010206073465 U CN 2010206073465U CN 201020607346 U CN201020607346 U CN 201020607346U CN 201918634 U CN201918634 U CN 201918634U
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Abstract
The utility model discloses a multi-optical path sheet type laser oscillator which comprises a pump light source, an optical coupling system, a double-color beam splitter, a parabolic reflector and a laser gain medium sheet which are sequentially arranged on a light path, wherein a double-right angle reflecting prism group and a coupling-out cavity mirror are also sequentially arranged behind the laser gain medium sheet; and the double-right angle reflecting prism group consists of a first right angle reflecting prism and a second right angle reflecting prism. The multi-optical path sheet type laser oscillator combines a pump cavity and a laser resonating cavity into one, namely, a pump light path and a laser oscillation light path are combined into one, therefore, the pump light can pass through the gain medium for multiple times to improve the pump efficiency; as the oscillation laser passes through the gain medium sheet for multiple times, the gain in the process of coming and going of light beam is improved by multiple times and even dozens of times, thereby improving the output power of a laser device. The multi-optical path sheet type laser oscillator is suitable for the laser device for the scientific research and the industrial processing.
Description
Technical field
The utility model relates to optical technical field, has related to a kind of many light paths sheet type laser oscillator particularly.
Background technology
Sheet type solid state laser and fiber laser are two progress the most great of current laser technology.The thermal effect of laser medium is the most important factor of restriction solid state laser progress, and high power (energy) is a pair of contradiction parameter that conditions each other with high beam quality.When the club-shaped solid laser device of headlight pumping or semiconductor laser (LD) profile pump can reach the laser power of kilowatt magnitude, but beam quality is very poor; Obtain beam quality preferably, can adopt the LD end pumping, but its power can not be too big, generally within tens of watts, thereby not only to have had high power (energy) but also the laser of high beam quality is arranged be to be difficult to realize always.Comparatively general way is to adopt the high-quality miniature laser to add the way of laser oscillator.Laser oscillator is a kind of important method for realizing that high power laser light has important use and is worth.
The notion of thin-sheet laser and design are the earliest all proposed by Stuttgart, Germany university (StuttgartUniversity).Gain medium (Yb:YAG and Nd:YVO
4In crystal) be generally discoidly, thickness is about 0.2mm.Sheet adhering is on heat sink, and cooling effectiveness is high, and its thermal gradient is that one dimension distributes, and the thermal gradient direction is along beam direction, thereby has reduced the thermic effects such as thermal lensing effect, the distortion of laser crystal heat, the hot deviation of light beam and birefringence effect on lateral cross section.The logical fast company of Germany has produced continuous (CW) laser of 8kW at present.
Because the horizontal phase distortion of gain media is little, thereby polarization, single-frequency, locked mode, frequency tuning, ultrashort pulse, frequency translation etc. can carry out on the platform of sheet type laser system, and these are that general solid state laser is difficult to realize.Now existing commercial thin-sheet laser.The VersaDisk laser power of the ELS company of Germany can reach 5W-100W, M
2＜1.1, the polarization ratio reaches 100: 1, and Mono Disk laser power reaches 5W-50W, M
2＜1.1.The thin-sheet laser power of Trumpf company has reached 1kW-8kW, and BPP is 8mmmrad, and the every producible power of Disk is 3kW-4kW.
Based on above reason, the demand of many light path lasers oscillator that a kind of sheet type laser structure of utility model and many light path lasers oscillator combine has become the technical problem that needs to be resolved hurrily in the art.
Summary of the invention
For overcoming deficiency of the prior art, the purpose of this utility model is to propose a kind of many light paths sheet type laser oscillator, this utility model has solved the high power of conventional laser and the problem that high beam quality conditions each other, optimized the pattern matching of pump light and laser, improve pumping efficiency and actual gain, thereby improved laser output power.
For solving the problems of the technologies described above, reach above-mentioned technical purpose, the utility model adopts following technical scheme:
A kind of many light paths sheet type laser oscillator, comprise a vibration light path system, described vibration light path system is included in the pump light source of settling successively on first light path, optical coupling system, beam splitting dichroic mirror, parabolic reflector, the gain medium thin slice, wherein, on the described light path, after the gain medium thin slice, also be mounted with two right-angle reflecting prism groups and coupling output cavity mirror successively, the described pair of right-angle reflecting prism group and the output cavity mirror that is coupled are made of first right-angle reflecting prism and second right-angle reflecting prism described pair of right-angle reflecting prism group, described right-angle reflecting prism comprises first reflecting surface, second reflecting surface and upper surface, described first reflecting surface is vertical mutually with described second reflecting surface, described first reflecting surface, three of described second reflecting surface and described upper surfaces are delivered personally in a P; Described right-angle reflecting prism comprises the 3rd reflecting surface, the 4th reflecting surface, first cut surface and second cut surface, described the 3rd reflecting surface is vertical mutually with described the 4th reflecting surface, described first cut surface becomes the α angle respectively with described second cut surface with the bottom surface, and the jack shaft about described second right-angle reflecting prism is symmetrically distributed, and described first cut surface and described second cut surface meet at an O; The point O of the some P of described first right-angle reflecting prism and described second right-angle reflecting prism offsets and closes, and described upper surface overlaps with described first cut surface and constitutes described pair of right-angle reflecting prism group.
Preferably, described pump light source is a semiconductor laser.
Preferably, described pump light source is the semiconductor laser of optical fiber coupling output.
Preferably, described first reflecting surface, described second reflecting surface, described the 3rd reflecting surface, described the 4th reflecting surface all pass through coating film treatment.
Preferably, described optical coupling system is lens.
Preferably, described beam splitting dichroic mirror is 45 ° of placements.
Preferably, the one side of described gain medium thin slice is provided with heat-sink system.
Preferably, described pair of right-angle reflecting prism group is prism of corner cube.
The workflow of many light paths sheet type laser oscillator of the present utility model is as follows:
With coupling output cavity mirror is starting point, the round oscillatory process of laser at resonant cavity described: laser is through the beam splitting dichroic mirror reflection of 45 ° of placements, incide parabolic reflector, the acting in conjunction of described parabolic reflector, gain media thin slice, two right-angle reflecting prism makes laser repeatedly by behind the gain media thin slice, turn back to coupling output cavity mirror along former road, form the closed loop vibration of laser.The luminous power of laser generation is by the overall gain and the total losses decision of light closed loop transmission in the chamber, and overall gain is owing to turn back and become 4ng for n time
01, g wherein
0For once passing the small signal gain coefficient of thin slice, 1 is the gain media sheet thickness, and total losses still mainly are the transmission loss of coupling output and the loss and the direct reflection loss of at every turn passing thin slice.Laser output power just depends on overall gain (4ng in closed loop transmission
01) with the ratio of total losses.The overall gain of conventional one way cavity resonator structure is 2g
01, by comparison, the overall gain of the cavity resonator structure that the utility model proposes is 2n a times of conventional structure, and the loss variation is very little, so the power output of this cavity resonator structure will increase greatly.
The structure of forming by parabolic reflector, gain media thin slice and two right-angle reflecting prism group in described pump cavity and the laser oscillation cavity, make the each reflex time plane of incidence of pump light and laser rotate, thereby the plane of incidence and reflecting surface (plane of incidence and reflecting surface coplane) when inciding the gain media thin slice after making pump light and laser focus on through parabolic reflector rotate through two right-angle reflecting prism groups.In the two-way process, pump light and laser distribute equably at the plane of incidence of gain media thin slice, angle between adjacent two planes of incidence is all identical, so pump light and laser can pass through the gain media thin slice by many equably light paths, helping the gain media thin slice absorbs equably fully to pump light, improve the pump light utilization ratio, improve inverted population fully, help improving the utilization ratio of gain media thin slice, consume inverted population fully, help eliminating thermal effect simultaneously, help improving beam quality.
The difference of pumping light path and vibration light path is, pump light through several times or tens gain medias will be fallen by full consumption after absorbing, and the oscillation light one way is many more through the gain media number of times, its gain is high more, hunting power is high more.
The calculating of laserresonator gain and loss.Suppose in laser closed loop oscillatory process that through the 2n secondary reflection, promptly oscillating laser passes through gain media 4n time to oscillating laser altogether in the gain media rear surface.If single is g by the small signal gain coefficient of gain media
1, 1 is the gain media sheet thickness, then the total gain in laser closed loop oscillatory process is 4ng
11.And loss is mainly coupling output, gain media absorbs, and the repeatedly direct reflection loss of parabolic reflector, gain media thin slice and two right-angle reflecting prism groups, wherein coupling output accounts for major part in loss, all the other losses all are far smaller than the coupling output loss, so many light paths of oscillating laser are promptly little to the round trip loss influence through the number of times of gain media.
In the laser oscillator that the utility model proposed, its laser output power P satisfies relation
α wherein
AlwaysBe the total losses of light in closed loop transmission, comprise coupling output loss α
Output, absorption loss and direct reflection loss in the chamber.Absorption and direct reflection loss are little more than the coupling output loss in the general chamber.Because many light paths, the overall gain of cavity resonator structure are 2n times of conventional structure, thereby power output increases greatly.
About the many light path lasers oscillator stability analysis that the utility model proposes.The laser generation light path is launched, utilized laser transmission abcd matrix theory, the stability of described many light path lasers oscillator is analyzed.The equivalent cavity of described resonant cavity is a flat-concave cavity, shows as calculated, realizes that the long effective cavity length that produces in many light paths process is
D wherein
1Be the light path of coupling output cavity mirror when oscillating laser incides the gain media thin slice for the first time; During 1≤i≤n-1, l
iFor oscillating laser in the once-through process the i time shines light path when inciding the gain media thin slice for the i+1 time from the gain media thin slice; l
nBe oscillating laser in the once-through process the n time light path when the gain media thin slice shines the reflective ridge (i.e. the intersection of two rectangular reflectings surface) that incides a right-angle reflecting prism two right-angle reflecting prism groups; f
2Focal length for parabolic reflector.Bring each light path after launching into ABCD, calculate g
1g
2The factor can obtain, effective cavity length
Within a large range, can realize laser generation.Therefore, the effective cavity length of many light paths resonant cavity is very long, can realize big single mode volume, makes full use of large-area gain media thin slice.
Compared with prior art, many light paths sheet type laser oscillator of the present utility model has following advantage:
1, improves pumping efficiency.If one way has and is reflected by thin slice for n time, passing gain media thin slice number of times after the round oscillatory process is 4n time, be conventional resonant cavity gain 2n doubly, promptly gain media absorbs number of times increases 2n doubly, make and improve the pump light utilization ratio by gain media absorptive pumping light fully.Remedied simultaneously the gain media sheet thickness little, to the low shortcoming of pump light single absorption efficiency.
2, after employing pumping light path and laser optical path overlapped, the gain coefficient of a round vibration of decision power is compared by gain media with the oscillating laser single had increased 4n times.
3, since pump light and the incident primary flat of laser beam in gain media constantly rotate, pump light and laser are evenly distributed in the gain media thin slice, overcome because the influence of the inhomogeneous or birefringence effect that thermal effect causes helps improving beam quality.
4, the equivalent cavity of described resonant cavity is a flat-concave cavity, calculates to show that effective cavity length is
Can be very long, can realize big single mode volume, make full use of large-area gain media thin slice.
5, described resonant cavity equivalence is a kind of prismatic reflection chamber, thereby can resist cavity mistuning (because temperature gradient optical fiber inhomogeneous or that mechanical reason causes departs from optical axis).
6, because pump light and laser oscillation cavity are same chamber, and pump light and oscillation light reach optimum Match, improve the conversion efficiency of pump light to laser greatly, improve the laser beam quality of output.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is the structural representation of pump cavity of the present utility model and laser oscillation cavity.
Fig. 2 a is the structural representation of first right-angle reflecting prism 701 of the present utility model.
Fig. 2 b is the structural representation of second right-angle reflecting prism 702 of the present utility model.
Fig. 3 a is the front view of the installation process first step of of the present utility model pair of right-angle reflecting prism group.
Fig. 3 b is the front view in second step of installation process of of the present utility model pair of right-angle reflecting prism group.
Fig. 3 c is the front view in the 3rd step of installation process of of the present utility model pair of right-angle reflecting prism group.
Fig. 4 is n=3 of the present utility model, two right-angle reflecting prism group three-dimensional effect diagrams during α=30 °.
Fig. 5 is n=3 of the present utility model, the perspective view of the schematic perspective view of pump cavity and laser generation structure during α=30 °.
Fig. 6 is n=3 of the present utility model, the luminous point distribution map during α=30 ° on the parabolic reflector cross section.
Fig. 7 is based on the n=3 of Fig. 1, and the pump light light path of pump cavity is launched schematic diagram during α=30 °.
Fig. 8 is based on the n=3 of Fig. 1, and the laser optical path of laser oscillation cavity launches schematic diagram during α=30 °.
Luminous point distribution map when Fig. 9 a is the n=1 of oscillator of the present utility model on the cross section of parabolic reflector.
Luminous point distribution map when Fig. 9 b is the n=2 of oscillator of the present utility model on the cross section of parabolic reflector.
Luminous point distribution map during the n=4 of Fig. 9 c oscillator of the present utility model on the cross section of parabolic reflector.
Luminous point distribution map during the n=5 of Fig. 9 d oscillator of the present utility model on the cross section of parabolic reflector.
Luminous point distribution map during the n=6 of Fig. 9 e oscillator of the present utility model on the cross section of parabolic reflector.
Luminous point distribution map during the n=6 of Fig. 9 f oscillator of the present utility model on the cross section of parabolic reflector.
Luminous point distribution map during the n=6 of Fig. 9 g oscillator of the present utility model on the cross section of parabolic reflector.
Number in the figure explanation: 101 pump light sources, 102 optical coupling systems, 103 beam splitting dichroic mirrors, 104 parabolic reflectors, 105 gain medium thin slices, the heat sink or cooling system of 106 gain medium thin slices, 107 pairs of right-angle reflecting prism groups, 108 coupling input cavity mirrors, 701 first right-angle reflecting prism, 702 second right-angle reflecting prism, S1 first reflecting surface, S2 second reflecting surface, the S3 upper surface, S4 first cut surface, S5 second cut surface, S6 the 3rd reflecting surface, S7 the 4th reflecting surface.
The a arrow is represented the input of laser, and the b arrow is represented the output of laser.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described in detail.
As shown in Figure 1, the system that pump cavity that the utility model proposes and laser oscillation cavity unite two into one mainly comprises pump light source 101, the optical coupling system 102 of pump light source, the beam splitting dichroic mirror 103 of 45 ° of placements, parabolic reflector 104, gain medium thin slice 105, the heat sink or cooling system 106 of gain medium thin slice, two right-angle reflecting prism groups 107, the coupling output cavity mirror 108 of laser oscillation cavity.Can add other optics such as polarizer, Q-switching device, nonlinear crystal in the described system.
As shown in Figure 1, described laser oscillation cavity is the beam splitting dichroic mirror 103 by 108,45 ° of placements of coupling output cavity mirror, parabolic reflector 104, and gain media thin slice 105, two right-angle reflecting prism groups 107 are formed.With coupling output cavity mirror 108 is the laser generation starting point, in conjunction with Fig. 1, the round oscillatory process of laser at resonant cavity described: laser is through beam splitting dichroic mirror 103 reflections of 45 ° of placements, incide parabolic reflector 104, the acting in conjunction of described parabolic reflector 104, gain media thin slice 105, two right-angle reflecting prism groups 107 makes laser repeatedly by behind the gain media thin slice 105, turn back to coupling output cavity mirror 108 along former road, form the closed loop vibration of laser.Two chamber mirrors of described laserresonator are respectively coupling output cavity mirror 108 and two right-angle reflecting prism group 107.Some measures can be passed through in the point or the zone of playing the mirror effect of resonant cavity chamber in the described pair of right-angle reflecting prism 107, for example this zone are hollowed out, allow laser pass through, externally add the chamber mirror of a routine then, this mode is suitable for some application scenario, but it has reduced half with the light path number.
As shown in Figure 1, described pumping system is by pump light source 101, the beam splitting dichroic mirror 103 of 102,45 ° of placements of optical coupling system, and parabolic reflector 104, gain media thin slice 105 and two right-angle reflecting prism group 107 are formed.Pump light enters in the resonant cavity recited above through the beam splitting dichroic mirror 103 of 45 ° of placements, incide parabolic reflector 104, the acting in conjunction of described parabolic reflector 104, gain media thin slice 105, two right-angle reflecting prism groups 107 is repeatedly fully absorbed pump light by gain media by gain media thin slice 105, the pump light that returns along original optical path with respect to initial pump only in a small amount.
As shown in Figure 2, described pair of right-angle reflecting prism group 107 formed by right-angle reflecting prism 701 with based on the right-angle reflecting prism 702 after right-angle reflecting prism 701 cuttings.
Shown in Fig. 2 (a), right-angle reflecting prism 701 in the two right-angle reflecting prism groups 107 shown in Fig. 1, its S1 and S2 are two orthogonal reflectings surface, S3 is the upper surface of right-angle reflecting prism 701.Wherein, two faces of S1 and S2 carry out coating film treatment, to reduce the loss of pump light and laser reflex time on right-angle reflecting prism 701 as far as possible.
Shown in Fig. 2 (b), second right-angle reflecting prism 702 in the two right-angle reflecting prism groups 107 shown in Fig. 1, and the cutting schematic diagram that obtains this right-angle reflecting prism 702 based on the right-angle reflecting prism 701 shown in Fig. 2 (a).S4 and S5 are the cut surfaces of right-angle prism 702, become the α angle respectively with the bottom surface, and are symmetrically distributed about the jack shaft of right-angle prism.Described cutting angle is the key factor that pumping light path and oscillating laser are realized many light paths, has determined the number of times of many light paths.The pass of the order of reflection n of laser on the gain media thin slice is n α=90 ° in described cutting angle α and the one way oscillatory process.S6 and S7 are two orthogonal reflectings surface of right-angle prism 702, and S6 and S7 need carry out coating film treatment, to reduce the loss of pump light and laser reflex time on right-angle reflecting prism 702 as far as possible.
As shown in Figure 3, utilize two right-angle reflecting prism shown in Fig. 2 (a) and Fig. 2 (b) to form the installation process of two right-angle reflecting prism groups.The first step, the some O of the some P of right-angle reflecting prism 701 and right-angle reflecting prism 702 overlaps, two reflectings surface that guarantee right-angle reflecting prism 701 simultaneously respectively with two reflecting surface coplanes of right-angle reflecting prism 702, i.e. S1 and S6 coplane, S2 and S67 coplane; Solderless wrapped connection contact (some P and some O) changes the α angle then, and the upper surface S 3 of right-angle reflecting prism 701 is overlapped with the cut surface S4 of right-angle reflecting prism 702, one side and make the one side of S3 and overlapping of S4.The schematic perspective view that forms as shown in Figure 4.
As shown in Figure 4, n=3, two right-angle reflecting prism group three-dimensional effect diagrams during α=30 °.Right-angle reflecting prism 701 has been formed the two right-angle reflecting prism groups 107 among Fig. 1 with right-angle reflecting prism 702.S1 wherein, S2, S6, four faces of S7 are crucial parts in two right-angle reflecting prism groups 107, play the effect that the plane of incidence with light constantly rotates.
As shown in Figure 5, n=3, the schematic perspective view of cavity resonator structure key component during α=30 °.Pump cavity is identical in part shown in Figure 5 with laser oscillation cavity.Arrow is represented the transmission direction of pump light or laser among the figure, is convenient to the utility model is described in detail.The center of the center of gain medium thin slice 105 and two right-angle reflecting prism groups 107 all is positioned on the axis of parabolic reflector 104.Gain medium thin slice 105 also is positioned on the focus of parabolic reflector 104.And, after having considered the refraction effect on gain medium thin slice 105 surfaces, the focus of parabolic reflector 104 is positioned at the center of the rear surface of gain medium thin slice 105 exactly, so that be parallel to the center that can focus on the rear surface of gain medium thin slice 105 when the optical axis of parabolic spherical mirror 104 incides on the parabolic spherical mirror 104 exactly, and direct reflection takes place.
As shown in Figure 5, because laser is identical with the pump light light path, so in structure shown in Figure 5, be transmitted as example with laser.Because the structure that parabolic reflector 104, gain media thin slice 105 and two right-angle reflecting prism group 107 (being made up of right-angle reflecting prism 701 and right-angle reflecting prism 702) are formed, make the incident primary flat of the each reflex time laser through two right-angle reflecting prism groups 107 of laser rotate, thereby the plane of incidence and reflecting surface (plane of incidence and reflecting surface coplane) when inciding gain media thin slice 105 after making laser focus on through parabolic reflector 104 rotate.As shown in Figure 5, n=3, among the embodiment during α=30 °, laser is through right-angle reflecting prism 701 reflections twice, and in right-angle reflecting prism 702 reflections twice, so laser common property on two right-angle reflecting prism groups 107 is given birth to twice plane of incidence rotation.As shown in Figure 5, laser reflects 3 times on gain media thin slice 105 altogether, angle is 60 ° between the reflecting surface each time, so laser can pass through the gain media thin slice by many equably light paths, help improving the utilization ratio of gain media thin slice 105, consume inverted population fully, help eliminating thermal effect simultaneously, help improving beam quality.
In like manner, for pump light, because the structure that parabolic reflector 104, gain media thin slice 105 and two right-angle reflecting prism group 107 (being made up of right-angle reflecting prism 701 and right-angle reflecting prism 702) are formed, the plane of incidence rotates when making pump light at every turn by gain media thin slice 105.As shown in Figure 5, n=3, among embodiment during α=30 °, pump light reflects 3 times on gain media thin slice 105 altogether, angle is 60 ° between the reflecting surface each time, so pump light can pass through the gain media thin slice by many equably light paths, helps 105 pairs of pump lights of gain media thin slice and absorbs fully equably, improve the pump light utilization ratio, improve inverted population fully.
And the advantage of a key of the structure as shown in Figure 5 that the utility model proposes is, pumping light path and laser optical path overlap in structure shown in Figure 5 fully, the advantage of the plane of incidence counter-rotating in structure shown in Figure 5 in conjunction with pump light and laser, make the pattern matching of pump light and laser that optimization more be arranged, help improving the light light conversion efficiency more, improve beam quality.
As shown in Figure 6, n=3, the luminous point distribution map during α=30 ° on the cross section of parabolic reflector 104.
N=3 as shown in Figure 7, pump light light path expanded view during α=30 °.
As shown in Figure 8, n=3, laser generation light path expanded view during α=30 °.
Below in conjunction with Fig. 5,6,7,8 couples of n=3, the present embodiment during α=30 ° describes in detail.
Pump light light path implementation process.As Fig. 5,6, shown in 7, pump light is along direction shown in the arrow (as shown in Figure 5) incident, the optical axis that at first is parallel to parabolic reflector 104 incides on the point 1 of parabolic reflector 104, focuses on gain medium thin slice 105 through parabolic reflector 104, and enters gain medium thin slice 105, pump light is absorbed the population inversion that is used for producing gain media by gain medium thin slice 105.Direct reflection takes place in pump light in gain medium thin slice 105 rear surfaces, by gain medium thin slice 105,105 pairs of pump lights of gain medium thin slice absorb once more and are used for population inversion once more.Pump light via 105 outgoing of gain medium thin slice after, on the oblique point 2 that is mapped to parabolic reflector 104, after parabolic reflector 104 reflections, the optical axis that is parallel to parabolic reflector 104 incides the S1 face of right-angle reflecting prism 701, reflex to the S2 face of right-angle reflecting prism 701 through the S1 face, on the parallel again point 3 that incides parabolic reflector 104.Through parabolic reflector 104 reflection, focus on the gain medium thin slice 105, through gain medium thin slice 105 absorb, the reflection of rear surface minute surface and gain medium thin slice 105 absorb again, on the oblique point 4 that is mapped to parabolic reflector 104.After parabolic reflector 104 reflection, the optical axis that is parallel to parabolic reflector 104 incides the S6 face of right-angle reflecting prism 702, reflexes to the S7 face of right-angle reflecting prism 702 through the S6 face, on the parallel again point 5 that incides parabolic reflector 104.Through parabolic reflector 104 reflection, focus on the gain medium thin slice 105, through gain medium thin slice 105 absorb, the reflection of rear surface minute surface and gain medium thin slice 105 absorb again, on the oblique point 6 that is mapped to parabolic reflector 104.After parabolic reflector 104 reflections, the optical axis that is parallel to parabolic reflector 104 incides on the ridge of right-angle reflecting prism 701, and promptly the intersection of S1 face and S2 face is the once-through process of pump cavity at this moment.As shown in Figure 7, behind the spinal reflex of right-angle reflecting prism 701, the former road of pump light is returned, the point 4 of the point 5 of the point 6 by parabolic reflector 104, gain media thin slice 105, parabolic reflector 104, gain media thin slice 105, parabolic reflector 104 successively, the point 2 of the point 3 of gain media thin slice 105, parabolic reflector 104, gain media thin slice 105, parabolic reflector 104, behind the point 1 of gain media thin slice 105, parabolic reflector 104, form complete pump light transmission course.Wherein pump light incides the ridge of right-angle reflecting prism 701 exactly, and former road, reflection back is returned, and this need realize by the incoming position of adjusting pump light.
According to above-mentioned to pump light light path implementation process, among this embodiment, be n=3, during α=30 °, an one pasa laser transmission course, pump light passes through gain medium thin slice 105 totally 6 times through gain medium thin slice 105 reflections 3 times, be gain medium thin slice 105 coabsorption pump lights 6 times, promptly 2n time (n=3 in the present embodiment); A two-way process, pump light are passed through gain medium thin slice 105 totally 12 times, and promptly gain medium thin slice 105 coabsorption pump lights are 12 times, promptly 4n time (n=3 in the present embodiment).Therefore, pump light is in the transmission course of pump cavity, make with respect to conventional resonant cavity, the absorption number of times of 105 pairs of pump lights of gain medium thin slice improves 2n doubly, be equivalent to the effective absorber thickness that has increased gain media thin slice 105, gain media thin slice 105 is absorptive pumping light fully, improves the pump light utilization ratio, remedied the gain media sheet thickness little, to the low shortcoming of pump light single absorption efficiency.Pump light is repeatedly introduced certain loss through the reflection of parabolic reflector 104, gain media thin slice 105 and two right-angle reflecting prism groups 107 in many light paths, but being far smaller than gain, these losses increase, and pump light has repeatedly increased the absorption and the utilization ratio of pump light greatly by gain media thin slice 105, can ignore above-mentioned loss fully.
The laser resonance process analysis procedure analysis.As Fig. 5,6, shown in 8, with coupling output cavity mirror 108 is the laser starting point of vibrating in the chamber, and laser is through along direction shown in the arrow (as shown in Figure 5) incident, and the optical axis that at first is parallel to parabolic reflector 104 incides on the point 1 of parabolic reflector 104, focus on gain medium thin slice 105 through parabolic reflector 104, and entering gain medium thin slice 105, oscillating laser consumes the inverted population of gain medium thin slice 105, obtains the single gain.Direct reflection takes place in oscillating laser in gain medium thin slice 105 rear surfaces, by gain medium thin slice 105, oscillating laser consumes the inverted population of gain medium thin slice 105 once more once more, obtains gain once more.Oscillating laser via 105 outgoing of gain medium thin slice after, on the oblique point 2 that is mapped to parabolic reflector 104, after parabolic reflector 104 reflections, the optical axis that is parallel to parabolic reflector 104 incides the S1 face of right-angle reflecting prism 701, reflex to the S2 face of right-angle reflecting prism 701 through the S1 face, on the parallel again point 3 that incides parabolic reflector 104.Through parabolic reflector 104 reflections, focus on the gain medium thin slice 105, the inverted population that obtains gain, the reflection of rear surface minute surface and consume gain medium thin slice 105 once more through the inverted population that consumes gain medium thin slice 105 obtains gain once more, on the oblique point 4 that is mapped to parabolic reflector 104.After parabolic reflector 104 reflection, the optical axis that is parallel to parabolic reflector 104 incides the S6 face of right-angle reflecting prism 702, reflexes to the S7 face of right-angle reflecting prism 702 through the S6 face, on the parallel again point 5 that incides parabolic reflector 104.Through parabolic reflector 104 reflections, focus on the gain medium thin slice 105, the inverted population that obtains gain, the reflection of rear surface minute surface and consume gain medium thin slice 105 once more through the inverted population that consumes gain medium thin slice 105 obtains gain once more, on the oblique point 6 that is mapped to parabolic reflector 104.After parabolic reflector 104 reflections, the optical axis that is parallel to parabolic reflector 104 incides on the ridge of right-angle reflecting prism 701, and promptly the intersection of S1 face and S2 face is an one pasa laser oscillatory process of resonant cavity at this moment.As shown in Figure 7, behind the spinal reflex of right-angle reflecting prism 701, oscillating laser returns along former road, the point 4 of the point 5 of the point 6 by parabolic reflector 104, gain media thin slice 105, parabolic reflector 104, gain media thin slice 105, parabolic reflector 104 successively, the point 2 of the point 3 of gain media thin slice 105, parabolic reflector 104, gain media thin slice 105, parabolic reflector 104, behind the point 1 of gain media thin slice 105, parabolic reflector 104, form one time two-way process.Wherein, oscillating laser incides the ridge of right-angle reflecting prism 701 exactly, and the reflection back is returned along former road, and this is that laser generation realizes reproducing certainly the result who selects automatically.
In conjunction with above-mentioned labor to the laser resonance process, among this embodiment, be n=3, during α=30 °, an one way oscillatory process, oscillating laser passes through gain medium thin slice 105 totally 6 times through gain medium thin slice 105 reflections 3 times, be that oscillating laser obtains 6 gains, promptly 2n time (n=3 in the present embodiment) altogether; A laser generation two-way process, oscillating laser are passed through gain medium thin slice 105 totally 12 times, and promptly oscillating laser obtains 12 gains, promptly 4n time (n=3 in the present embodiment) altogether.Therefore, in the laser closed loop oscillatory process, through the 2n secondary reflection, promptly oscillating laser passes through gain media 4n time to oscillating laser altogether in the gain media rear surface, and then the total small signal gain in laser closed loop oscillatory process is 4ng
01.A gain that comes and goes vibration of decision power is oscillating laser single 4n times by gain media.And loss is mainly the coupling output of output cavity mirror 108, the absorption loss of gain media 105, and the reflection loss of parabolic reflector 104, gain media thin slice 105 and two right-angle reflecting prism groups 107, wherein the coupling of output cavity mirror 108 output accounts for major part in loss, and the output loss that wherein is coupled is a major part, all the other losses are the output loss that is coupled far away, so many light paths of oscillating laser are promptly little to the round trip loss influence through the number of times of gain media thin slice 105.Can get according to above-mentioned formula (1.1), the structure that pump cavity that the utility model proposes and laserresonator unite two into one, the gain that can effectively improve a two-way process, and loss remains unchanged, then laser output power increases greatly.
According to above-mentioned pumping optical transmission process and laser closed loop oscillatory process, and in conjunction with Fig. 4,5,6, for the incidence point 1,2,3,4 of parabolic reflector glazed thread, 5,6 describe.1 and 2 about 105 symmetrical distributions of gain media thin slice; 2 and 3 ridges about right-angle reflecting prism 701 (being the intersection of S1 and S2 face) are symmetrically distributed; 3 and 4 about 105 symmetrical distributions of gain media thin slice; 4 and 5 ridges about right-angle reflecting prism 702 (being the intersection of S6 and S7 face) are symmetrically distributed; 5 and 6 about 105 symmetrical distributions of gain media thin slice.
Fig. 9 a to Fig. 9 g has showed n=1,2,4,5,6, and the luminous point distribution map on the cross section of 7,8 paraboloidal mirror.To n=3, embodiment procedure detailed and Fig. 2-8 during α=30 ° can analyze pump light transmission course and laserresonator oscillatory process among each embodiment in conjunction with above-mentioned.Described n and cutting angle α exist and concern n α=90 °.Following brief analysis is as follows:
Shown in Fig. 9 a, during n=1, cutting angle α=90 of right-angle reflecting prism 702 °, promptly two right-angle reflecting prism groups 107 only adopt a right-angle reflecting prism 701.In the present embodiment, in the two-way process, direct reflection takes place 2 times in gain medium thin slice 105 rear surfaces in pump light, passes through gain medium thin slice 105 totally 4 times, be gain medium thin slice 105 coabsorption pump lights 4 times, promptly 4n time (n=1 in the present embodiment); In the laser closed loop oscillatory process, oscillating laser in gain medium thin slice 105 rear surfaces through 2 secondary reflections, be that oscillating laser passes through gain medium thin slice 105 totally 4 times, obtain 4 gains, be 4n time (n=1 in the present embodiment), then the total small signal gain in laser closed loop oscillatory process is 4g
01.
Shown in Fig. 9 b, during n=2, cutting angle α=45 of right-angle reflecting prism 702 °.In the present embodiment, in the two-way process, direct reflection takes place 4 times in gain medium thin slice 105 rear surfaces in pump light, passes through gain medium thin slice 105 totally 8 times, be gain medium thin slice 105 coabsorption pump lights 8 times, promptly 4n time (n=2 in the present embodiment); In the laser closed loop oscillatory process, oscillating laser in gain medium thin slice 105 rear surfaces through 4 secondary reflections, be that oscillating laser passes through gain medium thin slice 105 totally 8 times, obtain 8 gains, be 4n time (n=2 in the present embodiment), then the total small signal gain in laser closed loop oscillatory process is 8g
01.
Shown in Fig. 9 c, during n=4, cutting angle α=22.5 of right-angle reflecting prism 702 °.In the present embodiment, in the two-way process, direct reflection takes place 8 times in gain medium thin slice 105 rear surfaces in pump light, passes through gain medium thin slice 105 totally 16 times, be gain medium thin slice 105 coabsorption pump lights 16 times, promptly 4n time (n=4 in the present embodiment); In the laser closed loop oscillatory process, oscillating laser in gain medium thin slice 105 rear surfaces through 8 secondary reflections, be that oscillating laser passes through gain medium thin slice 105 totally 16 times, obtain 16 gains, be 4n time (n=4 in the present embodiment), then the total small signal gain in laser closed loop oscillatory process is 16g
01.
Shown in Fig. 9 d, during n=5, cutting angle α=18 of right-angle reflecting prism 702 °.In the present embodiment, in the two-way process, direct reflection takes place 10 times in gain medium thin slice 105 rear surfaces in pump light, passes through gain medium thin slice 105 totally 20 times, be gain medium thin slice 105 coabsorption pump lights 20 times, promptly 4n time (n=5 in the present embodiment); In the laser closed loop oscillatory process, oscillating laser in gain medium thin slice 105 rear surfaces through 10 secondary reflections, be that oscillating laser passes through gain medium thin slice 105 totally 20 times, obtain 20 gains, be 4n time (n=5 in the present embodiment), then the total small signal gain in laser closed loop oscillatory process is 20g
01.
Shown in Fig. 9 e, during n=6, cutting angle α=15 of right-angle reflecting prism 702 °.In the present embodiment, in the two-way process, direct reflection takes place 12 times in gain medium thin slice 105 rear surfaces in pump light, passes through gain medium thin slice 105 totally 24 times, be gain medium thin slice 105 coabsorption pump lights 24 times, promptly 4n time (n=6 in the present embodiment); In the laser closed loop oscillatory process, oscillating laser in gain medium thin slice 105 rear surfaces through 12 secondary reflections, be that oscillating laser passes through gain medium thin slice 105 totally 24 times, obtain 24 gains, be 4n time (n=6 in the present embodiment), then the total small signal gain in laser closed loop oscillatory process is 24g
01.
Shown in Fig. 9 f, during n=7, cutting angle α=12.85 of right-angle reflecting prism 702 °.In the present embodiment, in the two-way process, direct reflection takes place 14 times in gain medium thin slice 105 rear surfaces in pump light, passes through gain medium thin slice 105 totally 28 times, be gain medium thin slice 105 coabsorption pump lights 28 times, promptly 4n time (n=7 in the present embodiment); In the laser closed loop oscillatory process, oscillating laser in gain medium thin slice 105 rear surfaces through 14 secondary reflections, be that oscillating laser passes through gain medium thin slice 105 totally 28 times, obtain 28 gains, be 4n time (n=7 in the present embodiment), then the total small signal gain in laser closed loop oscillatory process is 28g
01.
Shown in Fig. 9 g, during n=8, cutting angle α=11.25 of right-angle reflecting prism 702 °.In the present embodiment, in the two-way process, direct reflection takes place 16 times in gain medium thin slice 105 rear surfaces in pump light, passes through gain medium thin slice 105 totally 32 times, be gain medium thin slice 105 coabsorption pump lights 32 times, promptly 4n time (n=8 in the present embodiment); In the laser closed loop oscillatory process, oscillating laser in gain medium thin slice 105 rear surfaces through 16 secondary reflections, be that oscillating laser passes through gain medium thin slice 105 totally 32 times, obtain 32 gains, be 4n time (n=8 in the present embodiment), then the total small signal gain in laser closed loop oscillatory process is 32g
01.
Other related embodiment comprises that described pair of right-angle reflecting prism group adopts other optics that can realize the identical function effect or combination to replace; Add other optical element for example nonlinear optical crystal, adjusting Q crystal etc. in the described resonant cavity; The beam splitting dichroic mirror of the pump light source in the described pumping system, optical coupling system, 45 ° of placements can adopt the device and the structure of other equivalent function, all can adopt above-mentioned explanation to carry out corresponding analysis.
Claims (8)
1. the laser oscillator of light path sheet type more than a kind, be included in pump light source (101), optical coupling system (102), beam splitting dichroic mirror (103), parabolic reflector (104), the gain medium thin slice (105) settled successively on the light path, it is characterized in that: the pumping light path of gain medium thin slice and the laser generation light path of generation are same light path.
On the described light path, also be mounted with two right-angle reflecting prism groups (107) and coupling output cavity mirror (108) afterwards successively at gain medium thin slice (105), described pair of right-angle reflecting prism group (107) is made of first right-angle reflecting prism (701) and second right-angle reflecting prism (702), described right-angle reflecting prism (701) comprises first reflecting surface (S1), second reflecting surface (S2) and upper surface (S3), described first reflecting surface (S1) is vertical mutually with described second reflecting surface (S2), described first reflecting surface (S1), described second reflecting surface (S2) and three of described upper surfaces (S3) are delivered personally in a P; Described right-angle reflecting prism (702) comprises the 3rd reflecting surface (S6), the 4th reflecting surface (S7), first cut surface (S4) and second cut surface (S5), described the 3rd reflecting surface (S6) is vertical mutually with described the 4th reflecting surface (S7), described first cut surface (S4) becomes the α angle respectively with described second cut surface (S5) with the bottom surface, and the jack shaft about described second right-angle reflecting prism (702) is symmetrically distributed, and described first cut surface (S4) and described second cut surface (S5) meet at an O; The point O of the some P of described first right-angle reflecting prism (701) and described second right-angle reflecting prism (702) offsets and closes, and described upper surface (S3) overlaps with described first cut surface (S4) and constitutes described pair of right-angle reflecting prism group (107).
2. many light paths sheet type laser oscillator according to claim 1 is characterized in that described pump light source (101) is a semiconductor laser.
3. many light paths sheet type laser oscillator according to claim 1 is characterized in that, described pump light source (101) is the semiconductor laser of optical fiber coupling output.
4. many light paths sheet type laser oscillator according to claim 1 is characterized in that, described first reflecting surface (S1), described second reflecting surface (S2), described the 3rd reflecting surface (S6), described the 4th reflecting surface (S7) all pass through coating film treatment.
5. many light paths sheet type laser oscillator according to claim 1 is characterized in that described optical coupling system (102) is lens.
6. many light paths sheet type laser oscillator according to claim 1 is characterized in that described beam splitting dichroic mirror (103) is 45 ° of placements.
7. many light paths sheet type laser amplifier according to claim 1 is characterized in that the one side of described gain medium thin slice (105) is provided with heat-sink system (106).
8. many light paths sheet type laser oscillator according to claim 1 is characterized in that described pair of right-angle reflecting prism group (107) is prism of corner cube.
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| CN2010206073465U CN201918634U (en) | 2010-11-16 | 2010-11-16 | Multi-optical path sheet type laser oscillator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887699A (en) * | 2012-12-21 | 2014-06-25 | 中国科学院大连化学物理研究所 | Large-power pulse air-flow chemical laser apparatus |
| CN104247170A (en) * | 2012-04-26 | 2014-12-24 | 皇家飞利浦有限公司 | Optically pumped solid state laser device with self-aligning pump optics |
| CN120033529A (en) * | 2025-04-24 | 2025-05-23 | 中国科学院长春光学精密机械与物理研究所 | A photonic crystal semiconductor laser |
-
2010
- 2010-11-16 CN CN2010206073465U patent/CN201918634U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104247170A (en) * | 2012-04-26 | 2014-12-24 | 皇家飞利浦有限公司 | Optically pumped solid state laser device with self-aligning pump optics |
| CN104247170B (en) * | 2012-04-26 | 2017-07-18 | 皇家飞利浦有限公司 | The solid-state laser equipment of optical pumping with autoregistration pump optical device |
| CN103887699A (en) * | 2012-12-21 | 2014-06-25 | 中国科学院大连化学物理研究所 | Large-power pulse air-flow chemical laser apparatus |
| CN103887699B (en) * | 2012-12-21 | 2016-09-28 | 中国科学院大连化学物理研究所 | Highpowerpulse air-flow chemical laser device |
| CN120033529A (en) * | 2025-04-24 | 2025-05-23 | 中国科学院长春光学精密机械与物理研究所 | A photonic crystal semiconductor laser |
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