CN213660863U - Modular Raman beam combination laser - Google Patents
Modular Raman beam combination laser Download PDFInfo
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- CN213660863U CN213660863U CN202022949349.3U CN202022949349U CN213660863U CN 213660863 U CN213660863 U CN 213660863U CN 202022949349 U CN202022949349 U CN 202022949349U CN 213660863 U CN213660863 U CN 213660863U
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Abstract
The utility model discloses a modularization raman cluster laser instrument, include: the pump source emits a frequency of omegapThe pump light is divided into horizontal polarization by a first polarization beam splitter after passing through an optical isolatorTwo beams of light and vertically polarized light, the horizontally polarized light enters the seed light generation module and undergoes laser Raman scattering to generate light with frequency omegasStokes seed light of (1); the vertical polarized light serving as the pump light enters the pump light amplification module for amplification, the amplified pump light meets the Stokes seed light in the Raman gain module, and the Stokes seed light extracts the power of the pump light through the Raman process and then outputs the power. In this way, the utility model discloses can further satisfy the controllability demand to output under the prerequisite that realizes high output.
Description
Technical Field
The utility model relates to a laser instrument field especially relates to a modularization raman cluster laser instrument.
Background
High power, high beam quality's laser instrument all has extensive and important application in scientific research field and industrial field, for example inertial confinement fusion, laser high accuracy processing, remote sensing etc. since laser instrument utility model, people do not harm its beam quality's technique when improving laser output has very big interest. Laser wavefront phase distortion caused by the thermal lens effect of the gain medium under high-power operation of the laser is often contradictory to high-beam-quality laser output. The current methods for obtaining high power single frequency laser systems mainly include Main Oscillation Power Amplification (MOPA) and Coherent Beam Combination (CBC).
MOPA technology can increase laser power to a very high level, but laser linewidth broadening due to spontaneous emission (ASE) generated by an amplifier during amplification and wavefront phase distortion due to gain medium thermal effect both limit the beam quality of MOPA structures. The CBC technology can enable multi-path laser beams to be coherently superposed, the working principle of the CBC technology is that a plurality of small-energy and low-power lasers are combined into a large-energy and high-power laser, and the CBC technology is a parallel working mode, but due to the damage threshold limit of optical fibers and the high nonlinear effect gain (such as stimulated Brillouin scattering) caused by the strong limiting effect of a waveguide structure on the light, the further improvement of the power of the CBC technology is limited. Meanwhile, strict phase control is required to be performed on multiple laser beams to achieve the maximum amplification efficiency, a high requirement is made on the stability of the whole laser system, and the probability of achieving efficient combination is sharply reduced due to loss of the device to the beams and the requirement of the system to the phase along with the increase of the number of modules.
SUMMERY OF THE UTILITY MODEL
The utility model provides a laser instrument is restrainted to modularization raman group, the utility model discloses broken through the power protective screen of single laser instrument, promoted the output of light beam under the prerequisite that does not harm the light beam coherence, the utility model discloses select the diamond that has high raman gain coefficient and high thermal conductivity as raman gain medium for raman amplifier can realize broad operating wavelength range, compact and stable output, the detailed description that follows:
a modular raman group beam laser, the laser comprising:
the laser emitting frequency is omegapThe pump light is divided into two beams of horizontal polarized light p and vertical polarized light s by a first polarization beam splitter after passing through an optical isolator, the horizontal polarized light p enters a seed light generation module and is subjected to laser Raman scattering to generate frequency omegasStokes seed light of (1); the vertical polarized light s is used as pump light to enter a pump light amplification module for amplification, the amplified pump light meets Stokes seed light in a Raman gain module, and the Stokes seed light extracts the power of the pump light through a Raman process and then outputs the power.
The optical isolator consists of a first one-half wave plate of a pump light wave band and a Faraday isolator.
Furthermore, the seed light generation module consists of a second half wave plate of a pumping light waveband, a plano-convex lens, a Raman laser input mirror, a first diamond, a Raman laser output mirror and a long-pass filter;
the Raman laser input mirror, the first diamond and the Raman laser output mirror form a diamond Raman oscillator;
frequency of pump light and Stokes seed lightThe rate relation is omegas＝ωp-ωr，ωrAnd the Raman frequency shift quantity of the diamond.
The pump light amplification module consists of n third half-wave plates, n second polarization beam splitters, n laser amplifiers and n total reflection mirrors;
the vertically polarized light s is divided into p by the 1 st second polarization beam splitter after the polarization state of the vertically polarized light s is adjusted by the 1 st third half-wave plate1And s1Two beams of vertically polarized light s1After entering a 1 st laser amplifier for amplification, the Raman gain module enters the Raman amplifier through the 1 st full-reflection mirror for angle adjustment; horizontally polarized light p1After the polarization state of the second polarization beam splitter is adjusted by the 2 nd third half-wave plate, the second polarization beam splitter divides the second polarization beam into p2And s2Two beams of vertically polarized light s2The Raman signal enters a 2 nd laser amplifier for amplification, and enters a Raman gain module through the 2 nd full-reflection mirror for angle adjustment; horizontally polarized light p2The polarization state of the third half wave plate is adjusted by the 3 rd half wave plate and then is divided into p3And s3Two beams of vertically polarized light s3The Raman signal enters a 3 rd laser amplifier for amplification, and enters a Raman gain module through the 3 rd full-reflection mirror for angle adjustment; horizontally polarized light p3Entering the next stage of amplification structure, and so on until the horizontally polarized light pn-1Is divided into p after passing through an n-1 th second polarization beam splitternAnd snTwo beams of vertically polarized light snThe Raman signal enters an n-1 laser amplifier for amplification, and enters a Raman gain module through an n-1 total reflection mirror for angle adjustment; horizontally polarized light pn-1After the polarization state is adjusted by the nth third half-wave plate, the laser enters the nth laser amplifier through the nth second polarization beam splitter, and the amplified laser enters the Raman gain module through the nth full-reflection mirror for angle adjustment.
Furthermore, the Raman gain module consists of a first dichroic filter, a first convex lens, a second diamond, a second convex lens and a second dichroic filter;
the second diamond is arranged at a focus point where the light of the second convex lens converges, the Stokes seed light finishes a power extraction process at the second diamond, and then the light beam output is finished through the second convex lens and the second dichroic filter, and the second dichroic filter is used for realizing the output of the seed light.
The laser emitting frequency is omegapThe pumping light has a linewidth of gammapThe first diamond and the second diamond have a Raman gain linewidth of gammasSatisfy gammap≤Γs(ii) a The included angles of the n-beam parallel pump light and the Stokes seed light at the focal point in the second diamond are both smaller than 10 degrees.
The utility model provides a technical scheme's beneficial effect is:
1. the laser utilizes the spatial structure of the beam group to amplify power according to the stimulated Raman scattering amplification principle, breaks through the power amplification limit of a single laser, and realizes high-power laser output on the premise of ensuring the quality and coherence of light beams;
2. the laser selects solid Raman gain medium diamond as an amplification medium, and the performance of the Raman laser can be greatly improved by utilizing the characteristics of high Raman gain coefficient, maximum Raman frequency shift amount, relatively compromised Raman line width and the like of the diamond crystal;
3. the laser is a non-collinear beam combination laser, a plurality of laser beams enter the Raman gain module in parallel, and then the focal length is adjusted by the convex lens in the Raman gain module, so that the consideration of angle adjustment among the light beams is avoided;
4. the pumping light amplification modules of the laser provide more possibility for the output of the laser, and the controllability of the number of the pumping light amplification modules enables the laser power output by the whole system to be controllable, namely the high-power and power-controllable laser output can be realized by increasing or decreasing the number of the pumping light amplification modules.
Drawings
FIG. 1 is a schematic diagram of a modular Raman group beam laser;
FIG. 2 is a schematic diagram of an optical isolator;
FIG. 3 is a schematic structural diagram of a seed light generating module;
FIG. 4 is a schematic structural diagram of a pump light amplification module;
fig. 5 is a schematic structural diagram of a raman gain module.
In the drawings, the components represented by the respective reference numerals are listed below:
1: a laser; 2: an optical isolator;
3: a first polarizing beam splitter; 4: a seed light generating module;
5: a pump light amplification module; 6: and a Raman gain module.
Wherein
2-1: a first quarter wave plate; 2-2: a Faraday isolator;
4-1: a second half wave plate; 4-2: a plano-convex lens;
4-3: a Raman laser input mirror; 4-4: a first diamond;
4-5: a Raman laser output mirror; 4-6: a long-pass filter;
5-1: a third half wave plate; 5-2: a second polarizing beam splitter;
5-3: a laser amplifier; 5-4: a total reflection mirror;
6-1: a first dichroic filter; 6-2: a first convex lens;
6-3: a second diamond; 6-4: a second convex lens;
6-5: a second dichroic filter.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention are described in further detail below.
The laser beam combination method based on Raman amplification uses a plurality of beams of pump light to pump a beam of seed light, and the phases of the pump light and the seed light are automatically matched in the pumping process, so that the quality of a light beam output by a laser system is better than the output of a Main Oscillation Power Amplification (MOPA) structure.
Researchers have conducted extensive research into media for raman gain in order to obtain better beam quality, higher power laser output. The diamond crystal has the relative advantages of high thermal conductivity, high sound wave transmission speed, high damage threshold and the like by the mature crystal growth technology, and can realize laser output of ultraviolet, visible light and infrared bands. In addition, the diamond crystal has the characteristics of high Raman gain coefficient, maximum Raman frequency shift amount, relatively compromised Raman line width and the like, so that the diamond crystal becomes one of the most potential materials of a Raman gain medium, and the performance of a Raman laser can be greatly improved.
In order to improve light beam output power, break through the power barrier of single laser instrument, the embodiment of the utility model provides a high power raman group bundle laser instrument based on diamond.
Referring to fig. 1, the laser includes: the device comprises a laser 1, an optical isolator 2, a first polarization beam splitter 3, a seed light generating module 4, a pump light amplifying module 5 and a Raman gain module 6. Wherein, the pumping source 1 emits the frequency of omegapThe pump light is divided into two beams of horizontal polarized light p and vertical polarized light s by a first polarization beam splitter 3 after passing through an optical isolator 2, the horizontal polarized light p enters a seed light generation module 4 and undergoes laser Raman scattering to generate a frequency omegasStokes seed light of (1); the vertical polarized light s enters the pump light amplification module 5 as pump light for amplification, the amplified pump light meets the Stokes seed light in the Raman gain module 6, and the Stokes seed light extracts the power of the pump light through the Raman process and outputs the power.
Referring to fig. 2, the structural diagram of the optical isolator 2 is shown, which is composed of a first half-wave plate 2-1 and a faraday isolator 2-2. Wherein the first one-half wave plate 2-1 can realize omegapThe power of the pump light is adjusted, and the Faraday isolator 2-2 can realize the one-way transmission of the light path, thereby playing the role of protecting the laser 1.
Referring to fig. 3, the structure diagram of the seed light generation module 4 is shown, and the seed light generation module is composed of a second half-wave plate 4-1, a plano-convex lens 4-2, a raman laser input mirror 4-3, a first diamond 4-4, a raman laser output mirror 4-5, and a long pass filter 4-6. The polarization state of the incident beam is adjusted by the second half-wave plate 4-1 to obtain the maximumRaman gain, the plano-convex lens 4-2 can couple the incident light into a diamond Raman oscillator composed of a Raman laser input mirror 4-3, a first diamond 4-4 and a Raman laser output mirror 4-5 which are sequentially arranged along the light path, and then omega is obtained through stimulated Raman scatteringsAfter passing through the long pass filters 4-6, the residual pump light is absorbed to achieve a relatively pure ωsAnd (5) outputting laser.
Referring to fig. 4, a schematic structural diagram of the pump light amplification module 5 is shown, and the pump light amplification module is composed of n third half-wave plates 5-1, n second polarization beam splitters 5-2, n laser amplifiers 5-3, and n total reflection mirrors 5-4;
the vertically polarized light s is divided into p by the 1 st second polarization beam splitter 5-2 after the polarization state of the vertically polarized light s is adjusted by the 1 st third half wave plate 5-11And s1Two beams of vertically polarized light s1After entering a 1 st laser amplifier 5-3 for amplification, the Raman gain module 6 enters the Raman amplifier after the angle is adjusted by a 1 st total reflection mirror 5-4; horizontally polarized light p1After the polarization state is adjusted by the 2 nd third half-wave plate 5-1, the second polarization beam splitter 5-2 divides the light into p2And s2Two beams of vertically polarized light s2The Raman signal enters a 2 nd laser amplifier 5-3 for amplification, and enters a Raman gain module 6 after the angle is adjusted by a 2 nd total reflection mirror 5-4; horizontally polarized light p2The 3 rd third half-wave plate 5-1 is used for adjusting the polarization state and then dividing into p3And s3Two beams of vertically polarized light s3The Raman signal enters a 3 rd laser amplifier 5-3 for amplification, and enters a Raman gain module 6 after the angle is adjusted by a 3 rd total reflection mirror 5-4; horizontally polarized light p3Entering the next stage of amplification structure, and so on until the horizontally polarized light pn-1Is divided into p after passing through an n-1 th second polarization beam splitter 5-2nAnd snTwo beams of vertically polarized light snEnters an n-1 th laser amplifier 5-3 for amplification, and enters a Raman gain module 6 after the angle is adjusted by an n-1 th total reflection mirror 5-4; horizontally polarized light pn-1After the polarization state is adjusted by the nth third half wave plate 5-1, the laser enters the nth laser amplifier 5-3 through the nth polarization beam splitter 5-2, and the amplified laser enters the Raman gain after the angle is adjusted by the nth full-reflecting mirror 5-4In block 6.
Referring to fig. 5, a schematic structural diagram of the raman gain module 6 is shown, which is composed of a first dichroic filter 6-1, a first convex lens 6-2, a second diamond 6-3, a second convex lens 6-4, and a second dichroic filter 6-5. The first dichroic filter 6-1 is used for spatially combining the amplified parallel pump light and Stokes seed light, entering an optical cavity consisting of a first convex lens 6-2, a second diamond 6-3 and a second convex lens 6-4, the second diamond 6-3 is placed at a focus point where light rays of the second convex lens 6-4 converge, the Stokes seed light completes a power extraction process in the second diamond 6-3 (namely a Raman gain medium), then light beam output is completed through the second convex lens 6-4 and a second dichroic filter 6-5, and the second dichroic filter 6-5 is used for realizing omegasOutput of seed light.
The laser emitting frequency is omegapThe pumping light has a linewidth of gammapThe first diamond and the second diamond have a Raman gain linewidth of gammasSatisfy gammap≤Γs(ii) a The included angles of the n-beam parallel pump light and the Stokes seed light at the focal point in the second diamond are both smaller than 10 degrees.
To sum up, the utility model discloses the example divides into a plurality of modules with whole laser instrument, laser instrument 1, optical isolator 2, first polarization beam splitter 3, seed light produce module 4, pump light amplification module 5, raman gain module 6 promptly. The structure of the laser becomes compact in space through modular design, so that the laser is convenient to realize and has stronger practicability; particularly, the number of the pump light amplification modules 5 can be increased or decreased according to different requirements for the output power, so that the controllability requirement for the output power is further met on the premise of realizing high output power.
In a specific example, in a 9mm diamond crystal, 4 independent nanosecond pulses are output by a laser with a free-running wavelength of 1064nm, the peak power is 2kW, the power of more than 5kW is obtained by Stokes seed light with the peak power of 1240nm, and 62 percent of the total peak pump power is transferred to TEM00The model Stokes seed pulse verifies the feasibility of the product and meets various requirements in practical application.
The embodiment of the utility model provides a except that doing special explanation to the model of each device, the restriction is not done to the model of other devices, as long as can accomplish the device of above-mentioned function all can.
Those skilled in the art will appreciate that the drawings are only schematic illustrations of preferred embodiments, and the embodiments of the present invention are given the same reference numerals and are not intended to represent the merits of the embodiments.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (6)
1. A modular raman group beam laser, characterized in that it comprises:
the laser emitting frequency is omegapThe pump light is divided into two beams of horizontal polarized light and vertical polarized light by the first polarization beam splitter after passing through the optical isolator, the horizontal polarized light enters the seed light generation module and is subjected to laser Raman scattering to generate the frequency omegasStokes seed light of (1); the vertical polarized light serving as the pump light enters the pump light amplification module for amplification, the amplified pump light meets the Stokes seed light in the Raman gain module, and the Stokes seed light extracts the power of the pump light through the Raman process and then outputs the power.
2. The modular raman beam laser of claim 1, wherein said optical isolator is comprised of a first quarter wave plate in the pump optical band and a faraday isolator.
3. The modular raman beam laser of claim 2 wherein the seed light generation module comprises a second half wave plate in the pump optical band, a plano-convex lens and raman laser input mirror, a first diamond, a raman laser output mirror, and a long pass filter;
the Raman laser input mirror, the first diamond and the Raman laser output mirror form a diamond Raman oscillator;
the frequency relation of the pump light and the Stokes seed light is omegas＝ωp-ωr，ωrAnd the Raman frequency shift quantity of the diamond.
4. The modular raman beam laser of claim 3, wherein the pump-amplifying module comprises n third half-wave plates, n second polarization beam splitters, n laser amplifiers, and n total reflection mirrors;
the vertically polarized light is divided into p by the 1 st second polarization beam splitter after the polarization state of the vertically polarized light is adjusted by the 1 st third half-wave plate1And s1Two beams of vertically polarized light s1After entering a 1 st laser amplifier for amplification, the Raman gain module enters the Raman amplifier through the 1 st full-reflection mirror for angle adjustment; horizontally polarized light p1After the polarization state of the second polarization beam splitter is adjusted by the 2 nd third half-wave plate, the second polarization beam splitter divides the second polarization beam into p2And s2Two beams of vertically polarized light s2The Raman signal enters a 2 nd laser amplifier for amplification, and enters a Raman gain module through the 2 nd full-reflection mirror for angle adjustment; horizontally polarized light p2The polarization state of the third half wave plate is adjusted by the 3 rd half wave plate and then is divided into p3And s3Two beams of vertically polarized light s3The Raman signal enters a 3 rd laser amplifier for amplification, and enters a Raman gain module through the 3 rd full-reflection mirror for angle adjustment; horizontally polarized light p3Entering the next stage of amplification structure, and so on until the horizontally polarized light pn-1Is divided into p after passing through an n-1 th second polarization beam splitternAnd snTwo beams of vertically polarized light snThe Raman signal enters an n-1 laser amplifier for amplification, and enters a Raman gain module through an n-1 total reflection mirror for angle adjustment; horizontally polarized light pn-1The amplified laser enters the nth laser amplifier through the nth second polarization beam splitter, and the angle of the amplified laser is adjusted by the nth totally reflecting mirror to enter the Raman gain module.
5. The modular raman beam laser of claim 4 wherein said raman gain module is comprised of a first dichroic filter, a first convex lens, a second diamond, a second convex lens, a second dichroic filter;
the second diamond is arranged at a focus point where the light of the second convex lens converges, the Stokes seed light finishes a power extraction process at the second diamond, and then the light beam output is finished through the second convex lens and the second dichroic filter, and the second dichroic filter is used for realizing the output of the seed light.
6. The modular Raman group beam laser of claim 5, wherein the laser emits at a frequency ωpThe pumping light has a linewidth of gammapThe first diamond and the second diamond have a Raman gain linewidth of gammasSatisfy gammap≤Γs(ii) a The included angles of the n-beam parallel pump light and the Stokes seed light at the focal point in the second diamond are both smaller than 10 degrees.
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| CN112467512A (en) * | 2020-12-08 | 2021-03-09 | 河北工业大学 | Modular Raman beam combination laser |
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| CN112467512A (en) * | 2020-12-08 | 2021-03-09 | 河北工业大学 | Modular Raman beam combination laser |
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