CN116865079B - Dual-mode superposition regulation laser - Google Patents
Dual-mode superposition regulation laser Download PDFInfo
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- CN116865079B CN116865079B CN202311127022.XA CN202311127022A CN116865079B CN 116865079 B CN116865079 B CN 116865079B CN 202311127022 A CN202311127022 A CN 202311127022A CN 116865079 B CN116865079 B CN 116865079B
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- 230000009977 dual effect Effects 0.000 claims abstract 3
- 230000008878 coupling Effects 0.000 claims description 25
- 238000010168 coupling process Methods 0.000 claims description 25
- 238000005859 coupling reaction Methods 0.000 claims description 25
- 230000003287 optical effect Effects 0.000 claims description 15
- 238000005086 pumping Methods 0.000 claims description 9
- 238000002834 transmittance Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 8
- 238000011160 research Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000002474 experimental method Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
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- 239000013307 optical fiber Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08086—Multiple-wavelength emission
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/086—One or more reflectors having variable properties or positions for initial adjustment of the resonator
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
Abstract
A dual mode superposition modulated laser. Belongs to the technical field of laser modulation, and in particular relates to the technical field of dual-mode superposition laser modulation. The method solves the problem that the output of the tunable vortex beam of the multi-singular point OAM with the middle infrared wavelength of 2 mu m is difficult to realize. The laser comprises a pump light input module, a 45-degree reflecting mirror, a laser crystal, a half-reflecting half-lens, a high-order LG mode light generating module, a high-order HG mode light generating module and an output mirror. The laser can be applied to the technical field of tunable vortex beam output, the technical field of multi-singular point OAM beam output and other fields requiring tunable laser output.
Description
Technical Field
The invention belongs to the technical field of laser modulation, and particularly relates to the technical field of dual-mode superposition laser modulation.
Background
At present, a great deal of experimental research is carried out on vortex laser at home and abroad, and a great deal of results are obtained. Overall, compared with the optical fiber generation method, the space generation method has the advantages of compact overall system, wider topological charge number tuning range and easy realization. The space generation method has a certain problem in generating multiple singular point vortex beams, most of passive technical means can only generate vortex beams with fixed topological charge numbers, and it is difficult to realize tunable output of the topological charge numbers and multiple singular point OAM (Optical Angular Momentum optical orbital angular momentum), such as SPP (Surface Plasmon Polariton surface plasmon wavelet) can only be used for generating vortex beams with specific wave bands, and high-quality SPP, especially SPP for generating vortex beams with wave bands more than 2 μm in middle infrared, is very difficult to prepare; implementation of astigmatic mode transformation requires injection based on a specific HG (Hermite-Gaussian) mode, and cannot directly convert the fundamental mode beam; the SLM modulation and the nano optical super surface can realize the control of a large scale OAM, but the problems of low damage threshold, difficult tuning, high manufacturing cost, poor power expansibility and the like exist.
An OAM beam refers to a beam having optical orbital angular momentum, wherein HG mode describes the amplitude distribution of the beam in the vertical and horizontal directions, LG (Laguerre-Gaussian) mode describes the spiral nature of the beam, with a vortex-like phase structure.
Compared with the method, the solid laser system-based multi-singular point vortex beam generation in the active technical means in the space generation method is the simplest and most effective technical means for realizing OAM topology charge number tuning and can realize power expansion, and although the current common research is focused on Shan Jidian vortex beam tuning research, and the research on middle infrared 2 mu m and above wave band vortex beam tuning is almost blank, the potential of the method in multi-singular point OAM vortex beam tuning can be seen. Therefore, the solid laser system based on the active resonant cavity oscillation direct generation technology is hopeful to break through the technical bottleneck of multi-singular point OAM tunable 2 mu m vortex beam output.
In summary, with the development of the front-end fields such as the large-capacity communication wavelength division multiplexing and spatial multiplexing fusion technology, the multi-particle micro-nano-scale control, and even the multi-body military photoelectric countermeasure technology, the requirements of the multi-singular point OAM tunable vortex beam are urgent. Although researchers in various countries in the world have conducted intensive researches in theory and experiments, the analysis of the generalized general superposition evolution mechanism of the multi-singular point vortex light beam in the polymorphic group is not thorough, and the realization of the tunable vortex light beam output of the multi-singular point OAM in the wave band of 2 μm and above is difficult.
Disclosure of Invention
The invention provides a dual-mode superposition-regulated laser, which aims to solve the problem that the output of an infrared 2-mu m-band multi-singular point OAM tunable vortex beam is difficult to realize.
The laser comprises a pump light input module, a 45-degree reflecting mirror, a laser crystal, a half-reflecting half-lens, a high-order LG mode light generating module, a high-order HG mode light generating module and an output mirror;
the light emitted by the pumping light input module is transmitted into the laser crystal after entering the 45-degree reflecting mirror, and is emitted from the laser crystal and then enters the half-reflecting half-lens, the half-reflecting half-lens divides a light path into two paths, one path of the light is reflected into the high-order LG mode light generating module to generate high-order LG mode light, and the other path of the light is transmitted into the high-order HG mode light generating module to generate high-order HG mode light;
and after being emitted from the high-order LG mode light generating module, the high-order HG mode light returns to the 45-degree reflecting mirror along the original light path, and after being emitted from the high-order HG mode light generating module, the high-order LG mode light returns to the 45-degree reflecting mirror along the original light path, and the 45-degree reflecting mirror polymerizes the high-order LG mode light and the high-order HG mode light to form superimposed light and outputs the superimposed light through the output mirror.
The 45-degree reflecting mirror is coated with a high-transmittance film on the corresponding surface for receiving the light emitted by the pumping light input module, and is coated with a high-reflection film on the other surface.
Further, the high-order LG mode light generating module comprises a No. 1 Dove prism, a convex lens and a No. 1 high-reflection mirror, wherein the No. 1 Dove prism, the convex lens and the No. 1 high-reflection mirror are sequentially arranged along the incident light direction.
Further, the high-order HG mode light generating module comprises a No. 2 Dove prism and a No. 2 high-reflection mirror, and the No. 2 Dove prism and the No. 2 high-reflection mirror are sequentially arranged along the incident light direction.
Further, the pump light input module comprises an LD pump source, a No. 1 coupling mirror and a No. 2 coupling mirror; the No. 1 coupling mirror and the No. 2 coupling mirror are sequentially arranged along the direction of the emitted light of the LD pumping source.
Further, the LD pumping source, the No. 1 coupling mirror, the No. 2 coupling mirror, the 45-degree reflecting mirror, the laser crystal and the half-reflecting half-lens share the optical axis.
Further, the output mirror is co-axial with a 45 degree mirror.
Further, the half-reflecting half-lens, the convex lens and the No. 1 high-reflecting mirror share the optical axis.
The beneficial effects of the laser device of the invention are as follows:
(1) When the space method generates the multi-singular point vortex beam, the passive technical means can only generate the vortex beam in a fixed form, so that the tuning output of various OAM vortex beams is difficult to realize, the current common research of the active technical means is focused on the research of Shan Jidian vortex beam tuning, and the research of tuning the vortex beam in the wave band of 2 μm and above in the middle infrared is almost blank;
the laser fills the blank of middle-infrared 2 mu m wave band vortex beam tuning research, adopts the technical means that two vortex light modulation structures are overlapped together, finally generates the middle-infrared 2 mu m wave band multi-singular point OAM tunable vortex beam, and fills the technical blank.
(2) The laser adopts the principles of light path superposition and light path multiplexing, such as half-reflection and half-lens, so that the laser can split light and combine light paths, multiplexing of light path elements can be realized as much as possible, components can be saved, and the reduction of the volume of the laser can be realized.
(3) When vortex light generated by different devices is overlapped, the light path is not simply overlapped, stable vortex light overlapped output can be realized by coaxially processing the light generated by different devices, the most common technical means for coaxially processing is focusing, but for the coaxialization of a complex optical system or large-size vortex light, relatively longer optical path is required for focusing, so that the system is huge and loses compactness.
The laser can be applied to the technical field of tunable vortex beam output, the technical field of multi-singular point OAM beam output and other fields requiring tunable laser output.
Drawings
Fig. 1 is a diagram of a laser according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
Example 1,
The embodiment provides a dual-mode superposition regulation laser, as shown in fig. 1, which comprises an LD pump source 1, a No. 1 coupling mirror 2, a No. 2 coupling mirror 3, a 45-degree reflecting mirror 5, an output mirror 6, a laser crystal 7, a half-reflecting half-lens 8, a convex lens 9, a No. 1 high-reflecting mirror 10, a No. 2 high-reflecting mirror 11, a No. 2 Dove prism 12 and a No. 1 Dove prism 13.
The LD pump source 1, the No. 1 coupling mirror 2 and the No. 2 coupling mirror 3 form a pump light input module; the 45-degree reflecting mirror 5, the output mirror 6, the laser crystal 7, the half-reflecting half-lens 8, the convex lens 9, the No. 1 high-reflecting mirror 10, the No. 2 high-reflecting mirror 11, the No. 2 Dove prism 12 and the No. 1 Dove prism 13 form a main body part of the invention, and the superposition and the output of the mode light are carried out; the Dove prism 13, the convex lens 9 and the high-reflection mirror 10 form a high-order LG mode light generating module; the Dove prism No. 2 12 and the high-reflection mirror No. 2 form a high-order HG-mode light generating module.
The 45-degree reflecting mirror 5 is coated with a high-transmittance film on the corresponding surface for receiving the light emitted by the pumping light input module, and is coated with a high-reflection film on the other surface.
EXAMPLE 2,
In this embodiment, the light emitted by the pump light input module is incident on the 45-degree reflecting mirror 5 and then transmitted into the laser crystal 7, and is emitted from the laser crystal 7 and then enters the half-reflecting half-lens 8, the half-reflecting half-lens 8 divides the optical path into two paths, one path is reflected into the high-order LG mode light generating module to generate the high-order LG mode light, and the other path is transmitted into the high-order HG mode light generating module to generate the high-order HG mode light.
The high-order LG mode light is emitted from the high-order LG mode light generating module and then returned to the 45-degree reflecting mirror 5 along the original light path, the high-order HG mode light is emitted from the high-order HG mode light generating module and then returned to the 45-degree reflecting mirror 5 along the original light path, and the 45-degree reflecting mirror 5 aggregates the high-order LG mode light and the high-order HG mode light to form superimposed light and then outputs the superimposed light through the output mirror 6.
In the high-order LG mode light-generating module, a Dove prism No. 1 13, a convex lens 9 and a high-reflection mirror No. 1 10 are sequentially arranged along the direction of the incident light; a Dove prism No. 2 12 and a high-reflection mirror No. 2 11 in the high-order HG mode light generation module are sequentially arranged along the incident light direction; the No. 1 coupling mirror 2 and the No. 2 coupling mirror 3 are sequentially arranged along the light emitting direction of the LD pumping source 1; the LD pump source 1, the No. 1 coupling mirror 2, the No. 2 coupling mirror 3, the 45-degree reflecting mirror 5, the laser crystal 7 and the half-reflecting half-lens 8 share the optical axis; the output mirror 6 and the 45-degree reflecting mirror 5 share the optical axis; the half reflecting half lens 8, the convex lens 9 and the No. 1 high reflecting mirror 10 share the optical axis.
EXAMPLE 3,
This embodiment is a further limitation of embodiment 1, where 1 is an LD pump source, acting to pump laser light,
the No. 1 coupling mirror 2 and the No. 2 coupling mirror 3 form a collimation system 4, and the effect is that the pump light enters the laser crystal 7 after being collimated and focused by the coupling mirror group.
The 45-degree mirror 5 acts as a high transmission for pump light and a high reflection for laser light.
The laser crystal 7 adopts 2 mu m-band single-doped Tm or single-doped Ho laser crystal as a laser gain medium, and specifically adopts five crystals of Tm, YAG, tm, YLF, tm, YAP, ho, YAG and Ho.
The half mirror 8 functions as a beam splitter.
When the high-order LG mode light is generated, the curvature radius of the convex lens 9 is changed, so that the high-order LG mode light with different modes can be generated, the positions of the center of the No. 2 high-reflecting mirror 11 relative to the optical axis formed by the LD pump source 1, the No. 1 coupling mirror 2, the No. 2 coupling mirror 3, the 45-degree reflecting mirror 5, the laser crystal 7 and the half-reflecting half-lens 8 are changed, and the high-order HG mode light with different modes can be generated.
When the mode superposition of laser is carried out, according to the actual coaxial destruction degree, the vertical position of the longitudinal axis of the No. 2 Dove prism 12 in the light path is adjusted in the high-order HG mode light generating module, the horizontal position of the longitudinal axis of the No. 1 Dove prism 13 in the light path is adjusted in the high-order LG mode light generating module, the high-order HG mode light and the high-order LG mode light are coaxially processed, and finally superposition output is realized.
Claims (8)
1. The dual-mode superposition regulation laser is characterized by comprising a pumping light input module, a 45-degree reflecting mirror (5), a laser crystal (7), a half-reflecting half-lens (8), a high-order LG mode light generating module, a high-order HG mode light generating module and an output mirror (6);
the light emitted by the pumping light input module is transmitted into the laser crystal (7) after entering the 45-degree reflecting mirror (5), is emitted from the laser crystal (7) and enters the half-reflecting half-lens (8), the half-reflecting half-lens (8) divides a light path into two paths, one path of light is reflected into the high-order LG mode light generating module to generate high-order LG mode light, and the other path of light is transmitted into the high-order HG mode light generating module to generate high-order HG mode light;
the high-order LG mode light is emitted from the high-order LG mode light generating module and then returned to the 45-degree reflecting mirror (5) along the original light path, the high-order HG mode light is emitted from the high-order HG mode light generating module and then returned to the 45-degree reflecting mirror (5) along the original light path, and the 45-degree reflecting mirror (5) polymerizes the high-order LG mode light and the high-order HG mode light to form superimposed light and then outputs the superimposed light through the output mirror (6).
2. The dual-mode superposition modulated laser according to claim 1, wherein the 45-degree reflecting mirror (5) is coated with a high-transmittance film on a corresponding surface for receiving the light emitted by the pump light input module, and is coated with a high-reflection film on the other surface.
3. The dual-mode superposition modulated laser according to claim 1, wherein the high-order LG mode light-generating module comprises a Dove prism No. 1 (13), a convex lens (9) and a high-reflection mirror No. 1 (10), and the Dove prism No. 1 (13), the convex lens (9) and the high-reflection mirror No. 1 (10) are sequentially arranged along the incident light direction.
4. The dual-mode superposition modulated laser of claim 3, wherein the high-order HG-mode light generation module comprises a Dove prism No. 2 (12) and a high-reflection mirror No. 2 (11), and the Dove prism No. 2 (12) and the high-reflection mirror No. 2 (11) are sequentially arranged along the incident light direction.
5. The dual mode superposition modulated laser of claim 4, wherein said pump light input module comprises an LD pump source (1), a No. 1 coupling mirror (2) and a No. 2 coupling mirror (3); the No. 1 coupling mirror (2) and the No. 2 coupling mirror (3) are sequentially arranged along the light emitting direction of the LD pumping source (1).
6. The dual-mode superposition modulated laser of claim 5, wherein the LD pump source (1), the No. 1 coupling mirror (2), the No. 2 coupling mirror (3), the 45-degree reflecting mirror (5), the laser crystal (7) and the half-reflecting half-lens (8) share an optical axis.
7. The dual mode superposition modulated laser according to claim 6, wherein the output mirror (6) is co-axial with a 45 degree mirror (5).
8. The dual-mode superposition modulated laser according to claim 6, wherein the half-reflecting mirror (8), the convex lens (9) and the No. 1 high-reflecting mirror (10) share an optical axis.
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| CN202311127022.XA CN116865079B (en) | 2023-09-04 | 2023-09-04 | Dual-mode superposition regulation laser |
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| CN202311127022.XA CN116865079B (en) | 2023-09-04 | 2023-09-04 | Dual-mode superposition regulation laser |
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| CN116865079B true CN116865079B (en) | 2023-11-03 |
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| WO2018118953A1 (en) * | 2016-12-21 | 2018-06-28 | Arizona Board Of Regents On Behalf Of The University Of Arizona | Generation of high-power spatially-restructurable spectrally-tunable beams in a multi-arm-cavity vecsel-based laser system |
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2023
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