CN111653928A - Double-synchronous pumping Raman laser amplification device and method - Google Patents
Double-synchronous pumping Raman laser amplification device and method Download PDFInfo
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- 238000001069 Raman spectroscopy Methods 0.000 title claims abstract description 178
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
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- 229910009372 YVO4 Inorganic materials 0.000 claims description 3
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094026—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light for synchronously pumping, e.g. for mode locking
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- H—ELECTRICITY
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- 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
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
- H01S3/2308—Amplifier arrangements, e.g. MOPA
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Abstract
The invention discloses a double-synchronous pumping Raman laser amplification device and a method, comprising the following steps: a picosecond multi-pulse laser, a Raman synchronous pumping cavity A, a traveling wave amplifier and a Raman synchronous pumping cavity B; the picosecond pulse output by the picosecond multi-pulse laser is split by the first beam splitter, and reflected light enters the traveling wave amplifier to be amplified to obtain amplified fundamental frequency light; the transmitted light enters a Raman synchronous pumping cavity A for stimulated Raman scattering to obtain Stokes seed light; the amplified base frequency light and the Stokes seed light enter a Raman synchronous pumping cavity B for Raman synchronous amplification after being combined by the second beam splitter, and the high-order Stokes light after Raman synchronous amplification is output. The invention combines the picosecond multi-pulse technology, the Raman synchronous pumping technology and the Raman amplification technology, can effectively improve the picosecond Raman gain and obtain the picosecond high-order Stokes light output with high energy.
Description
Technical Field
The invention relates to the technical field of laser, in particular to a double-synchronous pumping Raman laser amplification device and method.
Background
The spectrum of the picosecond infrared band has very important application in the fields of laser ranging, laser remote sensing, national defense safety and the like, and stimulated Raman scattering is one of effective ways for obtaining the infrared band. Common 1064nm is used as fundamental frequency light, and high-quality Raman medium is adopted, so that the commonly used infrared spectrum with wave bands of 1.3 μm, 1.5 μm and even 2 μm can be obtained.
For picosecond stimulated Raman scattering, the ultra-short interaction time of light and a medium and the larger quantum bandwidth between the fundamental frequency light of an infrared band and the Stokes light can both cause lower Raman gain, thereby limiting the development of the picosecond Stokes light to higher orders. Therefore, the method for improving the picosecond Raman gain of the infrared band has important research significance and application value.
The existing picosecond infrared Raman scheme mainly focuses on picosecond laser pulse with the repetition frequency of MHz, the single pulse energy is weak, the Raman gain is low, the high-order Stokes light excitation is not facilitated, the cavity length of a Raman synchronous pumping cavity is too long, and the reliability is poor.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a double-synchronous pumping Raman laser amplification device and a method.
The invention discloses a double-synchronous pumping Raman laser amplification device, which comprises: a picosecond multi-pulse laser, a Raman synchronous pumping cavity A, a traveling wave amplifier and a Raman synchronous pumping cavity B;
the picosecond pulse output by the picosecond multi-pulse laser is split by the first beam splitter, and reflected light enters the traveling wave amplifier to be amplified to obtain amplified fundamental frequency light; the transmitted light enters the Raman synchronous pumping cavity A for stimulated Raman scattering to obtain Stokes seed light; and the amplified fundamental frequency light and the Stokes seed light enter the Raman synchronous pumping cavity B for Raman synchronous amplification after being combined by the second beam splitter, and the high-order Stokes light after Raman synchronous amplification is output.
As a further improvement of the present invention, the picosecond multipulse laser outputs a sequence of subpulses having equal time intervals T1 within the picosecond pulse envelope.
As a further improvement of the present invention, the first beam splitter and a first mirror located on a reflected optical path of the first beam splitter constitute a first retarder, and a distance between the first beam splitter and the first mirror is L1;
the second beam splitter and a second reflecting mirror positioned on the emergent light path of the traveling wave amplifier form a second retarder, and the distance between the second beam splitter and the second reflecting mirror is L2;
where L1+ L2 is c · T1, and c is the speed of light.
As a further improvement of the invention, the energy of the transmitted and reflected light beams of the first beam splitter is equal, and a fundamental frequency light single-point film layer is plated;
the energy of the transmitted and reflected light beams of the second beam splitter is equal, and a fundamental frequency light film layer and a Stokes light film layer are plated;
the first reflecting mirror and the second reflecting mirror are plated with fundamental frequency light single-point film layers.
As a further improvement of the invention, the traveling wave amplifier comprises a second half-wave plate, a thin film polaroid, a third half-wave plate, a convex lens and a side pump module which are arranged in sequence along the optical path.
As a further improvement of the invention, the side pump module adopts Nd: YAG crystal as a laser gain medium.
As a further improvement of the invention, the raman synchronous pumping cavity a or the raman synchronous pumping cavity B comprises an input cavity mirror, a raman medium and an output cavity mirror which are sequentially arranged along a light path;
the optical length of the Raman synchronous pumping cavity A or the Raman synchronous pumping cavity B is equal to 1/2n of the space distance of the adjacent sub-pulses, and n is an integer;
and a first half-wave plate is arranged between the Raman synchronous pumping cavity A and the first beam splitter.
As a further improvement of the invention, an input cavity mirror of the Raman synchronous pumping cavity A is plated with a fundamental frequency light high-transmittance film and a 1-order to high-order Stokes light high-reflection film; the Raman medium is a crystal material with stimulated Raman scattering effect, is not doped and is arranged in the heat sink; the output cavity mirror is plated with a fundamental frequency light high-reflection film, a 1-order Stokes light low-transmission film and a 2-order to high-order Stokes light semi-transmission film and is arranged on a precision translation stage;
an input cavity mirror of the Raman synchronous pumping cavity B is plated with a fundamental frequency light high-transmittance film, a 1-order Stokes light semi-permeable film and a 2-order to high-order Stokes light low-transmittance film; the Raman medium is a crystal material with stimulated Raman scattering effect, is not doped and is arranged in the heat sink; the output cavity mirror is plated with a fundamental frequency light high-reflection film, a 1-order to high-order Stokes light selective transmission film and is arranged on a precise translation platform.
As a further improvement of the invention, the Raman media of the Raman synchronous pumping cavity A and the Raman synchronous pumping cavity B are the same crystal material with stimulated Raman scattering effect, and comprise KGd (WO)4)2(KGW) crystal, diamond crystal, Ba (NO)3)2Crystal, YVO4One of the crystals;
the heat sink is aluminum or red copper and is circularly cooled by deionized water at 25 ℃;
the adjusting precision of the precision translation stage is 0.02 mm.
The invention also discloses a using method of the double-synchronous pumping Raman laser amplification device, which comprises the following steps:
picosecond pulses output by the picosecond multi-pulse laser are split by the first beam splitter to obtain reflected light and transmitted light;
the reflected light enters the traveling wave amplifier for amplification to obtain amplified fundamental frequency light;
the transmitted light enters the Raman synchronous pumping cavity A to be subjected to stimulated Raman scattering, and Stokes seed light is obtained;
and the amplified fundamental frequency light and the Stokes seed light enter the Raman synchronous pumping cavity B for Raman synchronous amplification after being combined by the second beam splitter, and the high-order Stokes light after Raman synchronous amplification is output.
Compared with the prior art, the invention has the beneficial effects that:
the invention combines the picosecond multi-pulse technology, the Raman synchronous pumping technology and the Raman amplification technology, can effectively improve the picosecond Raman gain and obtain the high-energy output of the picosecond high-order Stokes light.
Drawings
Fig. 1 is a schematic structural diagram of a double-synchronous pumping raman laser amplification device according to an embodiment of the present invention;
FIG. 2 is a multi-pulse sequence chart of picosecond multi-pulse laser output according to one embodiment of the present disclosure;
FIG. 3 is a graph showing the coating curves of the input mirrors of the Raman synchronous pumping chambers A and B according to an embodiment of the present invention;
FIG. 4 is a coating plot of the output mirrors of the Raman synchronized pumping chambers A and B according to one embodiment of the present disclosure;
fig. 5 is a coating curve diagram of raman medium double-end surfaces of the raman synchronous pumping cavities a and B according to an embodiment of the present invention.
In the figure:
10. a picosecond multi-pulse laser; 20. a Raman synchronous pumping cavity A; 30. a traveling wave amplifier; 40. a Raman synchronous pumping cavity B; 50. a first delayer; 60. a second delay.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention is described in further detail below with reference to the attached drawing figures:
the invention provides a double-synchronous pumping Raman laser amplification device and a method, comprising the following steps: a picosecond multi-pulse laser, a Raman synchronous pumping cavity A, a traveling wave amplifier and a Raman synchronous pumping cavity B; the picosecond pulse output by the picosecond multi-pulse laser is split by the first beam splitter, and reflected light enters the traveling wave amplifier to be amplified to obtain amplified fundamental frequency light; the transmitted light enters a Raman synchronous pumping cavity A for stimulated Raman scattering to obtain Stokes seed light; the amplified base frequency light and the Stokes seed light enter a Raman synchronous pumping cavity B for Raman synchronous amplification after being combined by the second beam splitter, and the high-order Stokes light after Raman synchronous amplification is output. The invention combines the picosecond multi-pulse technology, the Raman synchronous pumping technology and the Raman amplification technology, can effectively improve the picosecond Raman gain and obtain the high-energy output of the picosecond high-order Stokes light.
Specifically, the method comprises the following steps:
as shown in fig. 1, the present invention provides a double-synchronous pumping raman laser amplification device, including: a picosecond multipulse laser 10, a Raman-synchronized pumping cavity A20, a traveling wave amplifier 30, a Raman-synchronized pumping cavity B40, a first delay device 50, and a second delay device 60; wherein:
the picosecond pulses emitted by the picosecond multipulse laser 10 of the present invention are a multipulse sequence, and a plurality of subpulse sequences with equal interval time T1 are arranged in the envelope of the multipulse sequence. As shown in fig. 2, the picosecond multipulse laser 10 of the present invention emits multipulse sequence with power not lower than 10W, center wavelength 1064nm, pulse width of subpulses 20ps, four subpulses in each pulse envelope, and interval T1 of adjacent subpulses 1 ns.
The multi-pulse sequence emitted by the picosecond multi-pulse laser 10 of the invention forms reflected light and transmitted light through the first beam splitter BS1 of the first retarder 50; the reflected light enters the traveling wave amplifier 30 through the first mirror of the first retarder 50 for amplification to obtain amplified fundamental frequency light; the transmitted light enters a Raman synchronous pumping cavity A20 for stimulated Raman scattering to obtain Stokes seed light; after the amplified fundamental frequency light passes through the second reflecting mirror of the second retarder 60 and the Stokes seed light pass through the second beam splitter BS2 of the second retarder 60, the amplified fundamental frequency light and the Stokes seed light enter the Raman synchronous pumping cavity B40 for Raman synchronous amplification, and high-order Stokes light after Raman synchronous amplification is output; wherein the content of the first and second substances,
the first beam splitter and the second beam splitter are 1/2 beam splitters, and the first reflector and the second reflector are 45-degree HR reflectors; the distance between the first beam splitter and the first reflector is L1, and the distance between the second beam splitter and the second reflector is L2; l1+ L2 ═ c · T1, c is the speed of light; wherein, if T1 is 1ns, then L1+ L2 is 300 mm; the energy of the transmitted and reflected light beams of the first beam splitter is equal, and a fundamental frequency light single-point film layer is plated; the energy of the transmitted and reflected light beams of the second beam splitter is equal, and a fundamental frequency light film layer and a Stokes light film layer are plated; the first reflector and the second reflector are plated with fundamental frequency light single-point film layers.
The traveling wave amplifier 30 of the present invention includes a second half-wave plate HWP disposed in series along the optical path2A thin film polarizing plate TFP, aThree-half wave plate HWP3The reflected light of the first beam splitter horizontally enters the traveling wave amplifier 30 through the first reflector, and the transmitted light of the first beam splitter horizontally enters the Raman synchronous pumping cavity A20; the traveling wave amplifier 30 adopts a side pump module as laser energy amplification, the side pump module adopts Nd: YAG crystal as a laser gain medium, and the gain crystal is consistent with a picosecond multi-pulse laser; nd being YAG crystal, Nd3+The doping concentration of the ions is 1 at%, and the size is phi 4 × 78mm3。
When the side pump module is used, the first reflecting mirror is adjusted, so that the reflected light beam can be finely adjusted to be matched with the space of Nd: YAG crystals in the side pump module, and the maximum amplification power is not lower than 10W; adjusting the second half-wave plate HWP2The amplification power of the reflected beam can be finely scaled; adjusting third half-wave plate HWP3Matching the polarization state of the reflected beam to the raman vibrational mode of the raman medium of the raman-synchronized pump cavity B40; the second mirror is adjusted to direct the reflected beam into the main optical path.
The Raman synchronous pumping cavity A comprises an input cavity mirror R1, a Raman medium and an output cavity mirror R2 which are sequentially arranged along an optical path, wherein the coating curve of the input mirror R1 of the Raman synchronous pumping cavity A20 is shown in figure 3, the coating curve of the output mirror R2 of the Raman synchronous pumping cavity A20 is shown in figure 4, and the coating curves of the two end faces of the Raman medium of the Raman synchronous pumping cavity A20 are shown in figure 5. The optical length of the Raman synchronous pumping cavity A is equal to 1/2n of the space distance of the adjacent sub-pulses, and n is an integer; a first half-wave plate HWP is arranged between the Raman synchronous pumping cavity A and the first beam splitter BS11Adjusting the first half-wave plate HWP1The polarization state of the transmitted beam is matched to the raman vibrational mode of the raman medium of the raman-synchronized pump cavity a 20. Wherein, an input cavity mirror R1 of the Raman synchronous pumping cavity A20 is plated with a fundamental frequency light high-transmittance film and a 1-order to high-order Stokes light high-reflection film; the Raman medium is a crystal material with stimulated Raman scattering effect, is not doped and is arranged in the heat sink; the output cavity mirror R2 is plated with a fundamental frequency light high-reflection film, a 1-order Stokes light low-transmission film and a 2-order to high-order Stokes light semi-transmission film and is arranged on a precision translation stage; the optical length of the Raman synchronous pumping cavity A20 can be precisely adjusted by the precise translation stage, so that Raman can be performedThe output power of the synchronous pumping cavity A20 is maximum, and the output Stokes spectrum is most abundant.
Further, the heat sink adopts a mesoporous structure and is made of aluminum or red copper, and the heat sink is cooled and dissipated by circularly deionized water at 25 ℃; the adjusting precision of the precision translation stage is 0.02 mm.
Further, an input cavity mirror of the Raman synchronous pumping cavity A20 is plated with a 1064nm antireflection film and a 1.1-2.5 μm high-reflection film; the output cavity mirror of the Raman synchronous pumping cavity A20 is plated with a 1064nm high-reflection film, a 1.1-2.0 μm low-transmission film and a 2.0-2.5 μm semi-transmission film; and the two end faces of the Raman medium of the Raman synchronous pumping cavity A20 are plated with antireflection films of 1.0-2.5 mu m.
Further, the transmitted beam output from the raman synchronization pumping cavity a20 by the laser raman scattering is referred to as Stokes seed light, and the reflected beam amplified by the traveling wave amplifier 30 is referred to as amplified fundamental frequency light; the second sub-pulse of the Stokes seed optical sequence is synchronized with the first sub-pulse of the amplified fundamental frequency optical sequence at the second beam splitter BS2, and the Stokes seed optical and the amplified fundamental frequency optical are injected into the raman synchronous pump cavity B40 together.
The Raman synchronous pumping cavity B40 comprises an input cavity mirror R3, a Raman medium and an output cavity mirror R4 which are sequentially arranged along an optical path, wherein the coating curve of the input mirror R3 of the Raman synchronous pumping cavity B40 is shown in figure 3, the coating curve of the output mirror R4 of the Raman synchronous pumping cavity B40 is shown in figure 4, and the coating curves of the two end faces of the Raman medium of the Raman synchronous pumping cavity B40 are shown in figure 5. The optical length of the Raman synchronous pumping cavity B40 is equal to 1/2n of the space distance of the adjacent sub-pulses, wherein n is an integer; the optical length of the Raman synchronous pumping cavity B40 is finely adjusted, so that the output Stokes light pulse energy is maximum, the spectrum is richest, and the high-energy output of picosecond high-order Stokes light is obtained. Wherein, the input cavity mirror of the Raman synchronous pumping cavity B is plated with a fundamental frequency light high-transmittance film, a 1-order Stokes light semi-permeable film and a 2-order to high-order Stokes light low-transmittance film; the Raman medium is a crystal material with stimulated Raman scattering effect, is not doped and is arranged in the heat sink; the output cavity mirror is plated with a fundamental frequency light high-reflection film, a 1-order to high-order Stokes light selective transmission film and is arranged on a precise translation platform.
Further, the heat sink adopts a mesoporous structure and is made of aluminum or red copper, and the heat sink is cooled and dissipated by circularly deionized water at 25 ℃; the adjusting precision of the precision translation stage is 0.02 mm.
Further, an input cavity mirror of the Raman synchronous pumping cavity B40 is plated with a 1064nm antireflection film, a 1.1-micron semipermeable film and a 1.1-2.5-micron low-permeability film; the output cavity mirror of the Raman synchronous pumping cavity B40 is plated with a 1064nm high-reflection film, a 1.1-2.0 μm low-permeability film and a 2.0-2.5 μm semi-permeable film; and the two end faces of the Raman medium of the Raman synchronous pumping cavity B40 are plated with antireflection films of 1.0-2.5 mu m.
Further, the Raman mediums of the Raman synchronous pumping cavity A and the Raman synchronous pumping cavity B are the same crystal material with stimulated Raman scattering effect and are in the same Raman vibration mode, and the Raman medium comprises KGd (WO)4)2(KGW) crystal, diamond crystal, Ba (NO)3)2Crystal, YVO4One of the crystals.
The invention provides a method for using a double-synchronous pumping Raman laser amplification device, wherein the device is provided with two Raman synchronous pumping cavities, amplification base frequency light and Stokes seed light are injected into a Raman synchronous pumping cavity B synchronously, and the method comprises the following implementation steps:
picosecond pulses output by the picosecond multi-pulse laser are split by the first beam splitter to obtain reflected light and transmitted light; the reflected light enters a traveling wave amplifier for amplification to obtain amplified fundamental frequency light; the transmitted light enters a Raman synchronous pumping cavity A for stimulated Raman scattering to obtain Stokes seed light; the amplified base frequency light and the Stokes seed light enter a Raman synchronous pumping cavity B for Raman synchronous amplification after being combined by the second beam splitter, and the high-order Stokes light after Raman synchronous amplification is output.
The specific implementation process is as follows:
and 5, combining the Stokes seed light and the amplified base frequency light at a 1/2 beam splitter BS2, and completing time synchronization, wherein the time synchronization refers to the synchronization of the second sub-pulse of the Stokes seed light pulse sequence and the first sub-pulse of the amplified base frequency light pulse sequence.
And 6, synchronously injecting the Stokes seed light and the amplified base frequency light into the Raman synchronous pumping cavity B, enhancing the difference frequency between the base frequency light and the Stokes seed light and the Raman transition frequency resonance of a Raman medium, so as to enhance the interaction between the light and the medium, completing the amplification of the Stokes seed light energy and the spectrum expansion, and outputting the Stokes amplified light through the output cavity mirror R4.
The invention has the advantages that:
the invention combines the picosecond multi-pulse technology, the Raman synchronous pumping technology and the Raman amplification technology, can effectively improve the picosecond Raman gain and obtain the high-energy output of the picosecond high-order Stokes light.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A double synchronous pumping Raman laser amplification device is characterized by comprising: a picosecond multi-pulse laser, a Raman synchronous pumping cavity A, a traveling wave amplifier and a Raman synchronous pumping cavity B;
the picosecond pulse output by the picosecond multi-pulse laser is split by the first beam splitter, and reflected light enters the traveling wave amplifier to be amplified to obtain amplified fundamental frequency light; the transmitted light enters the Raman synchronous pumping cavity A for stimulated Raman scattering to obtain Stokes seed light; and the amplified fundamental frequency light and the Stokes seed light enter the Raman synchronous pumping cavity B for Raman synchronous amplification after being combined by the second beam splitter, and the high-order Stokes light after Raman synchronous amplification is output.
2. The dual-synchronous pumped raman laser amplification device of claim 1, wherein the picosecond multipulse laser outputs a sequence of subpulses having equal time intervals T1 within the picosecond pulse envelope.
3. The double-synchronous pumped raman laser amplification device of claim 2, wherein the first beam splitter and a first mirror located on a reflection optical path of the first beam splitter constitute a first retarder, and a distance between the first beam splitter and the first mirror is L1;
the second beam splitter and a second reflecting mirror positioned on the emergent light path of the traveling wave amplifier form a second retarder, and the distance between the second beam splitter and the second reflecting mirror is L2;
where L1+ L2 is c · T1, and c is the speed of light.
4. The double-synchronous pumped raman laser amplification device of claim 3, wherein the transmitted and reflected beams of the first beam splitter have equal energy and are coated with a fundamental frequency single-point optical film layer;
the energy of the transmitted and reflected light beams of the second beam splitter is equal, and a fundamental frequency light film layer and a Stokes light film layer are plated;
the first reflecting mirror and the second reflecting mirror are plated with fundamental frequency light single-point film layers.
5. The double-synchronously pumped raman laser amplification device of claim 1, wherein the traveling wave amplifier comprises a second half-wave plate, a thin film polarizer, a third half-wave plate, a convex lens, and a side pump module, which are arranged in this order along the optical path.
6. The double-synchronous pumped Raman laser amplification device of claim 1, wherein the side pump module employs a Nd: YAG crystal as a laser gain medium.
7. The double-synchronous pumped raman laser amplification device of claim 1, wherein the raman-synchronous pump chamber a or the raman-synchronous pump chamber B comprises an input cavity mirror, a raman medium, and an output cavity mirror disposed in that order along the optical path;
the optical length of the Raman synchronous pumping cavity A or the Raman synchronous pumping cavity B is equal to 1/2n of the space distance of the adjacent sub-pulses, and n is an integer;
and a first half-wave plate is arranged between the Raman synchronous pumping cavity A and the first beam splitter.
8. The double-synchronous pumped Raman laser amplification apparatus of claim 7, wherein the input cavity mirror of the Raman synchronous pumped cavity A is plated with a fundamental frequency light high-transmittance film, a 1 st order to high order Stokes light high-reflectance film; the Raman medium is a crystal material with stimulated Raman scattering effect, is not doped and is arranged in the heat sink; the output cavity mirror is plated with a fundamental frequency light high-reflection film, a 1-order Stokes light low-transmission film and a 2-order to high-order Stokes light semi-transmission film and is arranged on a precision translation stage;
an input cavity mirror of the Raman synchronous pumping cavity B is plated with a fundamental frequency light high-transmittance film, a 1-order Stokes light semi-permeable film and a 2-order to high-order Stokes light low-transmittance film; the Raman medium is a crystal material with stimulated Raman scattering effect, is not doped and is arranged in the heat sink; the output cavity mirror is plated with a fundamental frequency light high-reflection film, a 1-order to high-order Stokes light selective transmission film and is arranged on a precise translation platform.
9. The double-synchronous pumped Raman laser amplification apparatus of claim 8, wherein the Raman medium of the Raman-synchronous pumped cavity A and the Raman-synchronous pumped cavity B are the same crystal material with stimulated Raman scattering effect, including KGd (WO)4)2(KGW) crystal, diamond crystal, Ba (NO)3)2Crystal, YVO4One of the crystals;
the heat sink is aluminum or red copper and is circularly cooled by deionized water at 25 ℃;
the adjusting precision of the precision translation stage is 0.02 mm.
10. A method of a double-synchronous pumped raman laser amplification device according to any one of claims 1 to 9, comprising:
picosecond pulses output by the picosecond multi-pulse laser are split by the first beam splitter to obtain reflected light and transmitted light;
the reflected light enters the traveling wave amplifier for amplification to obtain amplified fundamental frequency light;
the transmitted light enters the Raman synchronous pumping cavity A to be subjected to stimulated Raman scattering, and Stokes seed light is obtained;
and the amplified fundamental frequency light and the Stokes seed light enter the Raman synchronous pumping cavity B for Raman synchronous amplification after being combined by the second beam splitter, and the high-order Stokes light after Raman synchronous amplification is output.
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