CN120473803A - Multi-order vortex light regeneration and amplification device based on adjustable defect mirror and control method - Google Patents
Multi-order vortex light regeneration and amplification device based on adjustable defect mirror and control methodInfo
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- CN120473803A CN120473803A CN202510399138.1A CN202510399138A CN120473803A CN 120473803 A CN120473803 A CN 120473803A CN 202510399138 A CN202510399138 A CN 202510399138A CN 120473803 A CN120473803 A CN 120473803A
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- mirror
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- vortex
- seed light
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
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Abstract
The invention relates to the technical field of laser, and provides a multi-order vortex light regeneration amplifying device based on an adjustable defect mirror, wherein an input/output light path comprises: the optical path of the regenerative amplifier comprises pumping light and a regenerative amplifier cavity with a defect mirror, wherein the regenerative amplifier cavity with the defect mirror comprises a second polarization beam splitter, a 1/4 wave plate, a Pockel cell, a concave mirror, the defect mirror, a crystal module, a dichroic mirror and a focusing lens. The invention can realize the generation of vortex light with different orders by using the defect mirror to control the radius of incident vortex rotation, the size of the defect on the defect mirror and the position of the defect mirror, and the defect-beam ratio is adjustable, thereby flexibly controlling the vortex order of the eigenmodes.
Description
Technical Field
The invention belongs to the technical field of lasers, and particularly relates to a multi-order vortex light regeneration amplifying device and a regulating and controlling method based on an adjustable defect mirror, which are suitable for generation and amplification of a tunable vortex light beam.
Background
The vortex beam is a laser beam with a spiral phase wavefront, the phase factor is e -ilφ, where l is the phase topology charge number and phi is the azimuthal direction. In a vortex beam, each photon has an Orbital Angular Momentum (OAM) l. Therefore, the method is widely applied in the fields of information coding, optical operation, laser ablation, quantum information processing, super-resolution imaging and the like. Pulsed vortex beams with high energy and short pulse duration, compared to continuous wave vortex beams, benefit from high peak power, which are more advantageous in optical processing, strong magnetic field generation, and nonlinear optical applications.
The generation method of the ultra-fast vortex pulse can be classified into a passive method and an active method. Passive methods refer to the conversion of a fundamental mode gaussian beam into a vortex beam by placing an optical element outside the laser cavity. The method has the defects that the light conversion efficiency is lower, the light beam quality is poor, vortex pulse is unstable in the propagation process and the like due to the introduction of the optical element, and the damage threshold of the optical element introduced in general is lower, so that the vortex pulse generation of high-energy short pulse cannot be realized. The active approach is to generate a swirling beam directly in the laser cavity. This method allows to guarantee the stability and beam quality of the swirling beam also in very high modes, at long transmission distances. For ultra-fast vortex pulses, the pulse energy of the oscillator is typically limited to the nJ order, though it can be generated directly in the cavity by a laser oscillator and regenerative amplification, but due to the relatively high repetition rate (typically on the order of MHz). The regenerative amplifier has obvious advantages in energy scaling for vortex pulses with lower repetition frequency, can increase the energy of seed light from nJ level to mJ-10 mJ level, and is commonly used as a low-energy high-gain amplifier. The current method for obtaining eddy current rotation based on a regenerative amplifier mainly uses a center damaged cavity mirror, an annular beam pump and the like. For ring beam pumping, a complex shaping system is required to obtain ring pump light and the stability is poor. The center damaged endoscope method is to manufacture damage points on the endoscope to inhibit low-order Gaussian mode oscillation, so that vortex rotation output is realized. Moreover, these methods have the disadvantage that the order of the eddy current rotation is not adjustable.
Disclosure of Invention
Aiming at the problems of non-adjustable orders, poor system stability, low energy conversion efficiency and the like in the conventional vortex light generation technology, the invention provides a multi-order vortex light regeneration amplifying device based on an adjustable defect mirror.
The technical scheme of the invention is as follows:
A multi-order vortex light regeneration amplifying device based on an adjustable defect mirror, comprising:
The input/output optical path is configured to input seed light and output amplified vortex light and comprises the seed light, a first polarization beam splitter, a Faraday rotator, a 1/2 wave plate and a plane reflector;
The regenerative amplification optical path is used for amplifying the input seed vortex rotation and comprises pump light and a regenerative amplifier cavity with a defect mirror, wherein the regenerative amplifier cavity with the defect mirror comprises a second polarization beam splitter, a 1/4 wave plate, a pockels cell, a concave mirror, a defect mirror, a crystal module, a dichroic mirror and a focusing lens;
The seed light passes through the first polarization beam splitter, passes through a Faraday rotator and a 1/2 wave plate, changes in polarization state, and then passes through the plane reflector and a second polarization beam splitter to be reflected and then enters the regenerative amplification light path;
the seed light entering the regeneration amplifying light path passes through the 1/4 wave plate, the Prkerr box and the first concave reflector, returns to the original path after being reflected by the first concave reflector and sequentially passes through the Prkerr box and the 1/4 wave plate, then passes through the second polarization beam splitter and the defect mirror, then reaches the crystal module, returns to the original path along the original path after being amplified by the crystal module and is amplified in a resonant cavity in a reciprocating manner, the round trip time of the seed light in the resonant cavity is controlled by controlling the working state and the working time of the Prkerr box, and the seed light is output from the first polarization beam splitter after reaching a target value.
Preferably, the center of the defect mirror is a circular opaque area, the rest areas have high transmittance to seed light, and the circular opaque areas on the defect mirror have different sizes.
Preferably, the incident seed light may be vortex light of different order modes.
Preferably, the defective mirror and the dichroic mirror have different distances therebetween.
The vortex optical order adjusting method adopts the regeneration amplifying device and is characterized by comprising the following steps:
Adjusting the diameter of the opaque region in the center of the defect mirror;
adjusting a distance between the defective mirror and the dichroic mirror;
Adjusting the radius of the light spot of the injected seed;
and the working voltage and the duration of the Prkerr box are controlled, so that the cyclic amplification of the seed light in the cavity is realized.
The diameter of the opaque area in the center of the defective mirror is adjusted by replacing defective mirrors with different specifications or by adopting a mechanical adjusting mechanism.
The adjustment range of the seed light spot radius is 0.5-1.5 mm.
The working voltage of the Prkeer box is lambda/4 voltage, and the duration is set according to the required amplification factor.
Compared with the prior art, the invention has the following advantages and technical effects:
by adjusting the diameter of the opaque area at the center of the defect mirror, the position of the defect mirror and the spot radius of incident seed light, vortex light output of different order modes can be realized, and meanwhile, the defect-beam ratio is adjustable, so that the vortex order of the eigen mode is flexibly controlled.
The mechanical adjustable defect mirror or the modularized replacement design is adopted, the order switching can be realized without replacing the whole optical system, the operation is simple and convenient, and the response speed is high.
The defect mirror adopts a high damage threshold material (such as fused quartz coating), can bear high-power pumping (> 10W) and short-pulse (femtosecond to nanosecond) load, and is suitable for industrial application.
Drawings
FIG. 1 is a schematic view of an optical path of an embodiment of a multi-stage vortex optical regeneration amplifying device based on an adjustable defect mirror;
FIG. 2 is a schematic diagram of the order of output vortex, the shape of the vortex output from the regenerating amplifying cavity and the vortex phase when the initial vortex radius is 0.75mm, the defects of different sizes on the defect mirror and the positions of the defect mirror are provided in the embodiment.
Reference numerals illustrate:
a first polarization beam splitter 1, a Faraday rotator 2, a 1/2 wave plate 3, a plane mirror 4, a second polarization beam splitter 5, a 1/4 wave plate 6, a Pockel cell 7, a concave mirror 8, a defect mirror 9, a gain crystal 10, a dichroic mirror 11, and a focusing lens 12.
Detailed Description
The following detailed description of the invention is provided in connection with the accompanying drawings and examples so that those skilled in the art may fully understand the technical scheme and implementation of the invention, but should not limit the scope of the invention.
A multi-order vortex optical regeneration amplifying device based on an adjustable defect mirror comprises an input optical path, an output optical path and a regeneration amplifier optical path, wherein the specific optical path structure is shown in figure 1, and the functions and connection relation of each optical element are as follows:
An input-output optical path comprising:
seed light adopts LG 01 mode vortex light seed light;
The first polarization beam splitter 1 has high reflection of the S polarization component and high transmission of the P polarization component of the seed light.
The Faraday rotator 2 is matched with the 1/2 wave plate 3 to adjust the polarization state of the seed light, so that the seed light can enter the regeneration amplifying cavity efficiently. Wherein the faraday rotator 2 changes the phase of the incident laser light by utilizing the non-reciprocal property of the magneto-optical material.
And the plane reflector 4 is used for reflecting the light path and optimizing the space layout.
The regenerative amplifier optical path comprises pump light and a regenerative amplifier cavity provided with a defective mirror.
The pump light, either a semiconductor laser or a solid state laser, is coupled to the gain crystal 10 by a dichroic mirror 11.
The second polarization beam splitter 5, the 1/4 wave plate 6 and the pockels cell 7 together form a polarization switch to control the back and forth path of the seed light in the cavity.
The Prkerr box 7 is used for being equivalent to a 1/4 wave plate when voltage is applied;
A concave mirror 8 is provided which,
The defect mirror 9 is provided with a circular opaque area (the radius adjustable range is 0.1-1 mm) at the center, and the other areas are high in transmittance (the transmittance is more than 99%) to seed light;
the gain crystal 10, in this embodiment, is a crystal such as Nd: YVO or Nd: YAG, and the mode matching of pump light and seed light is achieved through the dichroic mirror 11 and the focusing lens 12.
The dichroic mirror 11 is highly transparent to the pump light band and highly reflective to the seed light band.
The workflow of this embodiment is as follows:
1. Seed light injection
The seed light is transmitted by the first polarization beam splitter 1, the polarization state is rotated into S polarization after passing through the Faraday rotator 1 and the 1/2 wave plate 3, and the S polarization is reflected by the plane mirror 4 and the second polarization beam splitter 5 to enter the regeneration amplifying cavity.
2. Intracavity cyclic amplification
The seed light sequentially passes through a 1/4 wave plate 6, a Prkerr box 7 (without voltage) and a concave reflecting mirror 8, the polarization state is changed into P polarization after the original return, and the P polarization is transmitted to a defect mirror 9 through a second polarization beam splitter 5.
The central opaque region of the defect mirror 9 filters out the fundamental mode component, the higher-order vortex mode is reserved, and the light field is reflected by the dichroic mirror 11 after being amplified by the gain crystal 10, so that one round trip is completed.
The pockels cell 7 is energized and the seed light is cycled in the cavity multiple times until the energy reaches a set point.
3. Vortex rotation output
The voltage of the pockels cell 7 is withdrawn, the amplified vortex light is reflected and output by the second polarization beam splitter 5, and finally the vortex light is led out of the system through the first polarization beam splitter 1.
The traditional vortex rotation order regulation dimension limit is broken through by regulating the shading proportion and the cavity length of the defect mirror, and the topology charge l=0 to l=3 can be continuously regulated. When the radius of incident seed vortex light is fixed, the size of the opaque area on the defect mirror and the distance L between the defect mirror and the dichroic mirror are adjusted, so that vortex light with different orders can be obtained. As shown in fig. 2, the size and distance L range of the defect on the defective mirror required for the order of the vortex rotation is output at an initial vortex rotation radius of 0.75mm, and L outputs the vortex shape and vortex phase of the vortex rotation at a specific value. By changing the size of the incident seed vortex rotation and the size proportion of the opaque area on the defect mirror, vortex light with different orders can be generated.
Specifically, the incident light entering the optical path of the regenerative amplifier sequentially passes through the 1/4 wave plate 6, the non-energized pockels cell 7 and the concave mirror 8, and is reflected by the first concave mirror 8, and then returns to the original path to sequentially pass through the non-energized pockels cell 7 and the 1/4 wave plate 6, the polarization state of the vortex light changes, and then passes through the second polarization beam splitter 5 and the defect mirror 9, and then reaches the crystal module 10, the seed vortex light is amplified and reflected by the dichroic mirror 11, and then returns to the original path to the second polarization beam splitter 5 after sequentially passing through the crystal module 10, the defect mirror 9, the second polarization beam splitter 5, the 1/4 wave plate 6, the pockels cell 7 applying the quarter wave voltage to maintain the working state, and the concave mirror 8, and in the process, the polarization state of the seed light is kept unchanged by the first time and the second polarization beam splitter 5, and thus the seed light is oscillated in the resonance cavity after passing through the second polarization beam splitter 5, and the gain is amplified multiple times by the crystal 10. When a stable mode can be output, the quarter wave voltage applied to the pockels cell 7 is withdrawn, so that the pockels cell 7 is kept in an unoperated state, the polarization state of the seed light amplified in the cavity is changed after passing through the 1/4 wave plate 6 and the pockels cell 7 without power applied twice, then the amplified light is output by reflection of the second polarization beam splitter 5, and then the polarization state is kept unchanged after passing through the plane mirror 4, the 1/2 wave plate 3 and the Faraday rotator 2, and the amplified light is output by reflection of the first polarization beam splitter 1.
Compared with the traditional method, the vortex light generation with different orders can be realized by changing the size of the opaque area on the defect mirror, the size of the incident seed light and the position of the defect mirror, and meanwhile, the defect-beam ratio is adjustable, so that the vortex order of the eigenmodes is flexibly controlled.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a multistage vortex light regeneration amplification device based on adjustable defect mirror which characterized in that includes:
The input/output optical path is used for inputting seed light and outputting amplified vortex light and comprises the seed light, a first polarization beam splitter, a Faraday rotator, a 1/2 wave plate and a plane reflector which are arranged in sequence;
The regenerative amplification light path is used for amplifying the input seed vortex rotation and comprises pump light and a regenerative amplifier cavity with a defect mirror, wherein the regenerative amplifier cavity comprises a second polarization beam splitter, a 1/4 wave plate, a pockels cell, a concave reflector, a defect mirror, a crystal module, a dichroic mirror and a focusing lens which are arranged in sequence;
The center of the defect mirror is provided with a circular opaque region, other regions have high transmittance to seed light, and the radius adjustable range of the circular opaque region is 0.1-1 mm;
the pockels cell controls the number of trips of the seed light within the regenerative amplifier cavity by applying or withdrawing a lambda/4 voltage.
2. The multi-order vortex light regeneration amplifying device based on the adjustable defect mirror according to claim 1, wherein the seed light is reflected by the plane reflector and the second polarization beam splitter to enter the optical path of the regeneration amplifier after passing through the Faraday rotator and the 1/2 wave plate through the first polarization beam splitter and then passing through the plane reflector and the second polarization beam splitter;
the seed light entering the optical path of the regenerative amplifier passes through the 1/4 wave plate, the Prkerr box and the first concave reflector, returns to the original path after being reflected by the first concave reflector and sequentially passes through the Prkerr box and the 1/4 wave plate, then passes through the second polarization beam splitter and the defect mirror, then reaches the crystal module, returns to the original path along the original path after being amplified by the crystal module to be amplified in a resonant cavity to round and round, and the round trip time of the seed light in the resonant cavity is controlled by controlling the working state and the working time of the Prkerr box, and the seed light is output from the first polarization beam splitter after reaching the target.
3. The variable defect mirror-based multi-order vortex light regeneration amplifying device according to claim 1, wherein the incident seed light is vortex light of different orders.
4. The adjustable defect mirror-based multi-order vortex light regeneration amplifying device according to claim 1, wherein the defect mirror and the dichroic mirror have different distances therebetween.
5. A vortex optical order adjustment method, adopting the regenerative amplifying device according to any one of claims 1 to 4, comprising the following steps:
adjusting the radius of the opaque region in the center of the defect mirror;
adjusting a distance between the defective mirror and the dichroic mirror;
Adjusting the light spot radius of the injected seed light;
and the working voltage and the duration of the Prkerr box are controlled, so that the cyclic amplification of the seed light in the cavity is realized.
6. The method of claim 5, wherein the diameter adjustment of the central opaque region of the defective mirror is achieved by replacing the defective mirror with a different specification or by using a mechanical adjustment mechanism.
7. The method of claim 5, wherein the seed light spot radius is adjusted to a range of 0.5-1.5 mm.
8. The method of claim 5, wherein the pockels cell has an operating voltage of λ/4, and a duration is set according to a desired magnification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510399138.1A CN120473803A (en) | 2025-04-01 | 2025-04-01 | Multi-order vortex light regeneration and amplification device based on adjustable defect mirror and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510399138.1A CN120473803A (en) | 2025-04-01 | 2025-04-01 | Multi-order vortex light regeneration and amplification device based on adjustable defect mirror and control method |
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| Publication Number | Publication Date |
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| CN120473803A true CN120473803A (en) | 2025-08-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202510399138.1A Pending CN120473803A (en) | 2025-04-01 | 2025-04-01 | Multi-order vortex light regeneration and amplification device based on adjustable defect mirror and control method |
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| Country | Link |
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| CN (1) | CN120473803A (en) |
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2025
- 2025-04-01 CN CN202510399138.1A patent/CN120473803A/en active Pending
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