CN115995754A - Device and method for realizing 9.2 mu m middle infrared laser output through stimulated Raman scattering - Google Patents
Device and method for realizing 9.2 mu m middle infrared laser output through stimulated Raman scattering Download PDFInfo
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- CN115995754A CN115995754A CN202211558405.8A CN202211558405A CN115995754A CN 115995754 A CN115995754 A CN 115995754A CN 202211558405 A CN202211558405 A CN 202211558405A CN 115995754 A CN115995754 A CN 115995754A
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Abstract
The invention provides a device and a method for realizing 9.2 mu m mid-infrared laser output through stimulated Raman scattering, and belongs to the technical field of mid-infrared laser sources. In the invention, pump laser output by a pump laser is input into a first Raman tank filled with Raman medium gas to realize output of laser with wavelength of 1.9 mu m, then is input into a second Raman tank filled with Raman medium gas through a focusing lens to realize focusing, and is output from the Raman tank after being reflected for multiple times through a Herroitt concave mirror to realize multiple times focusing in the Raman tank. The invention utilizes the existing Nd-YAG fundamental frequency laser with large pulse energy as a pumping light source to pump Raman medium, and generates second-order Raman laser with 9.2 mu m wavelength through hydrogen stimulated Raman scattering. Compared with other obtaining methods, the method can obtain relatively high pulse peak power and relatively high laser pulse energy at 9.2 mu m.
Description
Technical Field
The invention belongs to the technical field of high-precision laser optimization, and relates to a device and a method for realizing 9.2 mu m middle infrared laser output through stimulated Raman scattering, wherein 9.2 mu m Raman laser output is realized through two-stage wavelength conversion of 1064nm laser, and the device and the method are applied to the fields of infrared detection, long-distance transmission of laser in the atmosphere, laser radar detection and the like.
Background
The 9.2 μm wavelength laser source is of great value in laser technology applications. The current technical means for obtaining the laser with the wavelength of 9.2 mu m mainly comprises a tunable CO2 gas laser, a medium-far infrared OPO laser and the like. Because 9.2 μm is positioned at the output edge of the carbon dioxide laser, the output power or single pulse energy is not ideal, and the Q-switched 9.2 μm laser with narrow pulse width and high peak power is difficult to obtain; OPO is a means for obtaining broadband laser tuning, the wave band range obtained by OPO is wide, part of crystal medium can obtain 9.2 mu m laser output by the OPO method, the beam quality of mid-infrared laser obtained by OPO method is poor, the lifting capacity is limited, [ Bai Zhenxu, gao Jia, zhao Chen, yan Bingzheng, ji Yaoyao, ding Jie ] and [ Lv Zhiwei ] the long-wave infrared laser research progress based on nonlinear frequency conversion [ optical journal ] the [ Yang Chao, the et al ] the mid-far infrared high-power quantum cascade laser technology research progress [ telemetry and tele-control ]
Control, 43.04 (2022): 126-146 ].
The laser with the wavelength of 9.2 mu m obtained by stimulated Raman scattering has the advantage of higher pulse peak power, the Nd-YAG laser with the wavelength of 1064nm is relatively mature in development, higher in output power and higher in output single-pulse energy, and the laser with the wavelength of 1064nm has high beam quality.
The beam quality improvement is used as a convenient method, new wavelength laser is generated by a stimulated Raman scattering method, a higher-order transverse mode in the pump laser beam is filtered or converted, and the generated Raman laser beam quality is obviously better than that of the pump laser. The technology realizes Raman laser regeneration under the condition of low air pressure by using a long-optical-path multi-focusing cavity mirror design, and effectively avoids laser ionization gas, a gas thermal lens, other nonlinear effects generated by interaction of strong laser and a medium, and the like.
Disclosure of Invention
The method is different from the existing method for obtaining 9.2 mu m laser by stimulated Raman, the existing method adopts higher pulse energy or higher hydrogen pressure to realize the output of 9.2 mu m Raman laser, the technical means for enhancing 9.2 mu m laser is not adopted in the process, the 9.2 mu m Raman laser output is obtained only by a simple focusing mode, the laser conversion efficiency is very limited, and the order of magnitude of laser conversion is only about 1%. The research shows that the rotational Raman scattering frequency shift in the hydrogen stimulated Raman process is 587cm -1 Is accompanied by a vibration frequency shift of 4155cm -1 The gain is generated, the laser with the wavelength of 1.9 mu m can be obtained by directly pumping hydrogen by 1064nm laser, meanwhile, the gain is also obtained by 2.1 mu m rotating Raman laser, when the pumping laser energy is continuously improved, the continuous enhancement can be obtained by 2.1 mu m, and the pulse energy competition is formed by the laser with the wavelength of 9.2 mu m.
The invention adopts a cascade Raman mode to divide two-step conversion, the first step realizes high-efficiency 1.9 mu m Raman laser output, and then the 1.9 mu m laser is used as pumping laser to pump hydrogen, so as to realize 9.2 mu m Raman laser output. In addition, the invention adopts a 1.9&9.2 mu mHR/2.1 mu mAR filter as a laser reflector to filter out the Raman laser with the diameter of 2.1 mu m, prevent gain amplification and promote the conversion of the Raman laser with the diameter of 9.2 mu m.
The invention provides a device and a method for obtaining 9.2 mu m mid-infrared laser through stimulated Raman scattering, which combine a stimulated Raman technology with a spatial filtering method, remove a higher-order mode by the spatial filtering method, and realize further optimization of laser beams by a Raman laser regeneration method.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an apparatus for achieving a mid-infrared laser output of 9.2 μm by stimulated raman scattering, the apparatus comprising a pump laser 1, a raman laser for a wavelength output of 1.9 μm and a raman laser for a wavelength output of 9.2 μm.
The pump laser 1 adopts laser with 1064nm laser fundamental frequency of Nd-YAG solid Q-switched pulse as a pump laser source.
The Raman laser outputting light with the wavelength of 1.9 mu m comprises a Raman pool I3-1, a window I2-1, a window II 2-2, a 0-degree reflector I4-1, a 0-degree reflector II 4-2, a dichroic mirror 5, a laser recoverer I6-1 and a Pelin Brillock prism 7.
The first Raman tank 3-1 is a hollow tubular container, high-pressure hydrogen is filled in the container, the air pressure range is between 0.01 and 10MPa, and the quality optimization of Raman laser beams is realized by adjusting the air pressure of the hydrogen in the first Raman tank 3-1; the first window 2-1 and the second window 2-2 are respectively arranged at two ends of the first Raman cell 3-1, the second window 2-2 is positioned at one end close to the pump laser 1, and laser antireflection films corresponding to the wavelengths of the pump laser and the Raman laser, namely 1064nm &1.9 mu mAR, are plated on the surfaces of the two windows.
The first 0-degree reflecting mirror 4-1 and the second 0-degree reflecting mirror 4-2 are respectively arranged at two ends inside the first Raman cell 3-1, the first 0-degree reflecting mirror 4-1 is opposite to the first window 2-1, and the second 0-degree reflecting mirror 4-2 is opposite to the second window 2-2.
The dichroic mirror 5, the first laser recoverer 6-1 and the Pelin Brillock prism 7 are positioned outside the first Raman cell 3-1, wherein the Pelin Brillock prism 7 is positioned below the dichroic mirror 5, and the first laser recoverer 6-1 is positioned behind the dichroic mirror 5.
The central axis of the laser beam emitted by the pump laser 1 is taken as an axis, the laser beam enters the first Raman cell 3-1 through the second window 2-2, the laser beam is output to the outside of the first Raman cell 3-1 after passing through the first window 2-1 through the two reflections of the first 0-degree reflecting mirror 4-2 and the first 0-degree reflecting mirror 4-1, the laser beam is split by the dichroic mirror 5, the laser beam with the wavelength of 1064nm is transmitted after being split, the transmitted laser enters the first laser recoverer 6-1, the laser with the wavelength of 1.9 mu m is reflected and enters the Pelin Buloka prism 7, the laser with the wavelength of 1.9 mu m is reflected by the Pelin Buloka prism 7, and the propagation direction of the laser is deflected by 90 degrees.
The Raman laser outputting light with the wavelength of 9.2 μm comprises a second Raman cell 3-2, a third window 2-3, a fourth window 2-4, a second laser recoverer 6-2, a third laser recoverer 6-3, a first focusing lens 8-1, a second focusing lens 8-2, a first Herroitt concave reflector 9-1 and a second Herroitt concave reflector 9-2.
The second Raman tank 3-2 is a hollow tubular container, high-pressure hydrogen is filled in the hollow tubular container, the hydrogen pressure is between 0.01 and 10MPa, and the quality optimization of Raman laser beams is realized by adjusting the pressure of the second Raman tank 3-2; the third window 2-3 and the fourth window 2-4 are respectively arranged at two ends of the second Raman cell 3-2, the third window 2-3 is positioned at one end close to the Pelin Brillock prism 7, and laser antireflection films corresponding to pumping laser and Raman laser wavelengths, namely 1.9 mu m &9.2 mu mAR, are plated on the surfaces of the two windows.
The first focusing lens 8-1 is positioned outside the second Raman cell 3-2, is arranged on the incidence side of the laser beam of the third window 2-3, and is coaxial with the laser beam; the second focusing lens 8-2 is positioned in the second Raman cell 3-2 and is arranged on the incidence side of the laser beam of the fourth window 2-4, and the second focusing lens and the laser beam are coaxial.
The Herroitt concave reflector I9-1 and the Herroitt concave reflector II 9-2 are respectively arranged at two ends inside the Raman pond II 3-2, the Herroitt concave reflector I9-1 is opposite to the window III 2-3 and is confocal to the focusing lens I8-1, the Herroitt concave reflector II 9-2 is opposite to the window IV 2-4 and is confocal to the focusing lens II 8-2; the concave surfaces of the first Herroitt concave mirror 9-1 and the second Herroitt concave mirror 9-2 are plated with a laser 0-degree high-reflection film with the thickness of 1.9 μm and 9.2 μm, and have high transmission capacity for 2.1 μm laser, and the 2.1 μm laser generated in stimulated Raman scattering is filtered.
The second laser recoverer 6-2 and the third laser recoverer 6-3 are respectively positioned in the second Raman cell 3-2, and are respectively arranged on one side of the second Herroitt concave reflecting mirror 9-2 and the first Herroitt concave reflecting mirror 9-1, from which 2.1 mu m laser is filtered, and are used for recovering and consuming 2.1 mu m wavelength laser.
The laser beam reflected by the Pelin Brillock prism 7 enters the Raman pond II 3-2 after passing through the focusing lens I8-1 and the window III 2-3, in the Raman pond II 3-2, the laser beam irradiates onto the Herroitt concave mirror I9-1, the laser beams with the wavelength of 1.9 mu m and 9.2 mu m are reflected by the Herroitt concave mirror I9-1, the laser beams are reflected to the Herroitt concave mirror II 9-2 and then reflected by the Herroitt concave mirror II 9-2, the laser beams are output to the outside of the Raman pond II 3-2 after passing through the focusing lens II 8-2 and the window IV 2-4 in sequence, meanwhile, the laser beams with the wavelength of 2.1 mu m need to be filtered out, and the laser beams with the wavelength of 2.1 mu m enter the laser recoverer II 6-2 and the laser recoverer III 6-3 after passing through the Herroitt concave mirror I9-1 and the Herroitt concave mirror II-2 are consumed.
The focal length of the first focusing lens 8-1 and the second focusing lens 8-2 is matched with the length of the second Raman pool 3-2 and the curvatures of the first Herroitt concave reflecting mirror 9-1 and the second Herroitt concave reflecting mirror 9-2, and the quality optimization of Raman laser beams is realized by adjusting the curvatures of the focusing lenses and the second Herroitt concave reflecting mirrors and the length of the second Raman pool 3-2. When the laser beam is placed, the first focusing lens 8-1 and the second Herroitt concave reflecting mirror 9-1 are placed in a confocal way, laser is focused through the first focusing lens 8-1, the laser is focused into a Raman medium, the laser is focused again through the reflection of the first Herroitt concave reflecting mirror 9-1 and then irradiates onto the second Herroitt concave reflecting mirror 9-2, the laser is focused again through the reflection of the second Herroitt concave reflecting mirror 9-2, and the total three focusing of the laser beam is realized in the second Raman cell 3-2.
A method of achieving a 9.2 μm mid-infrared laser output by stimulated raman scattering, the method comprising the steps of:
and step one, filling hydrogen into the first Raman tank 3-1 and the second Raman tank 3-2 respectively.
Step two, the optical path is regulated, so that the 1064nm wavelength laser beam output by the pump laser 1 is led into the first Raman cell 3-1 through the second window 2-2, and the laser beam is reflected for multiple times in the first Raman cell 3-1 through the first 0-degree reflecting mirror 4-1 and the second 0-degree reflecting mirror 4-2 and then is output to the outside of the first Raman cell 3-1 through the first window 2-1.
Step three, the output 1064nm laser and the generated 1.9 mu m Raman laser are filtered by a dichroic mirror 5, the 1.9 mu m Raman laser is reflected, and the remaining 1064nm laser is transmitted and then enters a laser recoverer I6-1; the 1.9 μm Raman laser enters a Raman laser with a wavelength of 9.2 μm after being turned over by a dichroic mirror 5 and a Pelin Brillock prism 7.
Step four, after passing through the focusing lens I8-1 and the window III 2-3, the Raman laser of 1.9 mu m reflected by the Pelin Brillock prism 7 enters the Raman pond II 3-2 and is focused, after passing through the two Herroitt concave reflectors for two times, the Raman laser is output to the outside of the Raman pond II 3-2 through the focusing lens II 8-2 and the window IV 2-4, and the laser beam is focused again after being reflected by the Herroitt concave reflector each time, so as to realize three times of focusing in the Raman pond II 3-2; during the period, after the rotation Raman 2.1 μm laser generated by the 1.9 μm laser is filtered by the two Herroitt concave reflectors and the recovery consumption of the two laser recoverers, the dual-wavelength laser of 1.9 μm and 9.2 μm is remained to be reflected and focused in the Raman pond II 3-2, and finally the 9.2 μm mid-infrared laser is obtained.
The invention has the beneficial effects that:
the invention adopts a cascade Raman mode to divide two-step conversion, the first step realizes high-efficiency 1.9 mu m Raman laser output, and then the 1.9 mu m laser is used as pumping laser to pump hydrogen, so as to realize 9.2 mu m Raman laser output. In addition, the invention adopts a 1.9&9.2 mu mHR/2.1 mu mAR filter as a laser reflector to filter out the Raman laser with the diameter of 2.1 mu m, prevent gain amplification and promote the conversion of the Raman laser with the diameter of 9.2 mu m.
Drawings
FIG. 1 is a schematic view of the structure of the device of the present invention.
In the figure: a pump laser 1; window one 2-1; window two 2-2; windows three 2-3; window four 2-4; a first Raman pool 3-1; 3-2 of a Raman pool II; a 0 degree mirror, 4-1; a second 0-degree reflector 4-2; a dichroic mirror 5; a first laser recoverer 6-1; a second laser recoverer 6-2; 6-3 parts of laser recoverer; a petlin bloka prism 7; focusing lens I8-1; a second focusing lens 8-2; herroitt concave mirror one 9-1; herroitt concave mirror two 9-2.
Detailed Description
The invention is further illustrated below with reference to specific examples.
Examples
As shown in FIG. 1, the device of the invention is schematically shown in structure, in this embodiment, a solid Nd: YAG laser with an output wavelength of 1064nm is used as a pumping light source, which can output 900mJ laser as a single pulse.
The assembly device according to fig. 1 is as follows:
an apparatus for realizing 9.2 μm mid-infrared laser output by stimulated raman scattering comprises a pump laser 1, a raman laser for 1.9 μm wavelength output and a raman laser for 9.2 μm wavelength output.
The pump laser 1 adopts laser with 1064nm laser fundamental frequency of Nd-YAG solid Q-switched pulse as a pump laser source.
The Raman laser outputting light with the wavelength of 1.9 μm comprises a Raman pool I3-1, a window I2-1, a window II 2-2, a 0-degree reflector I4-1, a 0-degree reflector II 4-2, a dichroic mirror 5, a laser recoverer I6-1 and a Pelin Brillock prism 7.
The first Raman tank 3-1 is a hollow tubular container with the length of 1.5m, and the inside of the first Raman tank is filled with hydrogen with the pressure of 2.5 MPa; the first window 2-1 and the second window 2-2 are respectively arranged at two ends of the first Raman cell 3-1, the second window 2-2 is positioned at one end close to the pump laser 1, and 1064nm &1.9 mu mAR is plated on the surfaces of the two windows.
The first 0-degree reflecting mirror 4-1 and the second 0-degree reflecting mirror 4-2 are respectively arranged at two ends inside the first Raman cell 3-1, the first 0-degree reflecting mirror 4-1 is opposite to the first window 2-1, and the second 0-degree reflecting mirror 4-2 is opposite to the second window 2-2.
The central axis of the laser beam emitted by the pump laser 1 is taken as an axis, the laser beam enters the first Raman cell 3-1 through the second window 2-2, the laser beam is output to the outside of the first Raman cell 3-1 after passing through the first window 2-1 through the twice reflection of the first 0-degree reflector 4-2 and the first 0-degree reflector 4-1, the laser beam with the wavelength of 1064nm is transmitted through the light split of the dichroic mirror 5, the laser beam transmitted by the laser beam enters the first laser recoverer 6-1,1.9 mu m and then enters the Pelin Buloka prism 7, and the propagation direction of the laser beam with the wavelength of 1.9 mu m is turned to 90 degrees after being reflected by the Pelin Buloka prism.
The Raman laser outputting light with the wavelength of 9.2 μm comprises a second Raman cell 3-2, a third window 2-3, a fourth window 2-4, a second laser recoverer 6-2, a third laser recoverer 6-3, a first focusing lens 8-1, a second focusing lens 8-2, a first Herroitt concave reflector 9-1 and a second Herroitt concave reflector 9-2.
The second Raman tank 3-2 is a hollow tubular container, the length of the second Raman tank is 1.3m, and 0.5MPa hydrogen is filled in the second Raman tank; the third window 2-3 and the fourth window 2-4 are respectively arranged at two ends of the second Raman cell 3-2, the third window 2-3 is positioned at one end close to the Pelin Brillock prism 7, and the surfaces of the two windows are plated with 1.9 mu m &9.2 mu mAR.
The first focusing lens 8-1 is positioned outside the second Raman cell 3-2, is arranged on the incidence side of the laser beam of the third window 2-3, and is coaxial with the laser beam; the second focusing lens 8-2 is positioned in the second Raman cell 3-2 and is arranged on the incidence side of the laser beam of the fourth window 2-4, and the second focusing lens and the laser beam are coaxial, wherein the focal lengths of the first focusing lens 8-1 and the second focusing lens 8-2 are both 0.5m.
The curvatures of the Herroitt concave mirror I9-1 and the Herroitt concave mirror II 9-2 are 1m, the Herroitt concave mirror I9-1 and the Herroitt concave mirror II are respectively arranged at two ends inside the Raman cell II 3-2, the Herroitt concave mirror I9-1 is opposite to the window III 2-3 and is confocal to the focusing lens I8-1, the Herroitt concave mirror II 9-2 is opposite to the window IV 2-4 and is confocal to the focusing lens II 8-2; the concave surfaces of the first Herroitt concave mirror 9-1 and the second Herroitt concave mirror 9-2 are plated with a laser 0-degree high-reflection film with the thickness of 1.9 μm and 9.2 μm, and have high transmission capacity for 2.1 μm laser, and the 2.1 μm laser generated in stimulated Raman scattering is filtered.
The second laser recoverer 6-2 and the third laser recoverer 6-3 are respectively positioned in the second Raman cell 3-2, and are respectively arranged on one side of the second Herroitt concave reflecting mirror 9-2 and the first Herroitt concave reflecting mirror 9-1, from which 2.1 mu m laser is filtered, and are used for recovering and consuming 2.1 mu m wavelength laser.
The laser beam reflected by the Pelin Brillock prism 7 enters the Raman pond II 3-2 after passing through the focusing lens I8-1 and the window III 2-3, the laser beam irradiates the Herroitt concave mirror I9-1, the laser beams of 1.9 mu m and 9.2 mu m are reflected to the Herroitt concave mirror II 9-2 by the reflection of the Herroitt concave mirror I9-1, and then the laser beam is output to the outside of the Raman pond II 3-2 after passing through the focusing lens II 8-2 and the window IV 2-4 in sequence, and meanwhile, the laser beams of 2.1 mu m enter the laser recoverer II 6-2 and the laser recoverer III 6-3 respectively and are consumed.
When the laser focusing device is placed, the first focusing lens 8-1 and the second Herroitt concave mirror 9-1 are placed in a confocal mode, laser is focused through the first focusing lens 8-1, the laser is focused into a Raman medium, the laser is focused again through reflection of the first Herroitt concave mirror 9-1 and then irradiated onto the second Herroitt concave mirror 9-2, the laser is focused again through reflection of the second Herroitt concave mirror 9-2, and total three focusing of the laser beam is achieved in the Raman cell 3-2.
A method of achieving a 9.2 μm mid-infrared laser output by stimulated raman scattering, the method comprising the steps of:
step one, filling hydrogen with the pressure of 2.5MPa into a first Raman tank 3-1, and filling hydrogen with the pressure of 0.5MPa into a second Raman tank 3-2.
Step two, the optical path is regulated, so that the 1064nm wavelength laser beam output by the pump laser 1 is led into the first Raman cell 3-1 through the second window 2-2, and the laser beam is reflected for multiple times in the first Raman cell 3-1 through the first 0-degree reflecting mirror 4-1 and the second 0-degree reflecting mirror 4-2 and then is output to the outside of the first Raman cell 3-1 through the first window 2-1.
Step three, the output 1064nm laser and the generated 1.9 mu m Raman laser are filtered by a dichroic mirror 5, the 1.9 mu m Raman laser is reflected, and the remaining 1064nm laser is transmitted and then enters a laser recoverer I6-1; the 1.9 μm Raman laser enters a Raman laser with a wavelength of 9.2 μm after being turned over by a dichroic mirror 5 and a Pelin Brillock prism 7.
Step four, after passing through the focusing lens I8-1 and the window III 2-3, the Raman laser of 1.9 mu m reflected by the Pelin Brillock prism 7 enters the Raman pond II 3-2 and is focused, after passing through the two Herroitt concave reflectors for two times, the Raman laser is output to the outside of the Raman pond II 3-2 through the focusing lens II 8-2 and the window IV 2-4, and the laser beam is focused again after being reflected by the Herroitt concave reflector each time, so as to realize three times of focusing in the Raman pond II 3-2; during the period, after the rotation Raman 2.1 μm laser generated by the 1.9 μm laser is filtered by the two Herroitt concave reflectors and the recovery consumption of the two laser recoverers, the dual-wavelength laser of 1.9 μm and 9.2 μm is remained to be reflected and focused in the Raman pond II 3-2, and finally the 9.2 μm mid-infrared laser is obtained.
The examples described above represent only embodiments of the invention and are not to be understood as limiting the scope of the patent of the invention, it being pointed out that several variants and modifications may be made by those skilled in the art without departing from the concept of the invention, which fall within the scope of protection of the invention.
Claims (3)
1. A device for realizing a 9.2 μm mid-infrared laser output by stimulated raman scattering, characterized in that the device comprises a pump laser (1), a raman laser outputting at a wavelength of 1.9 μm and a raman laser outputting at a wavelength of 9.2 μm;
YAG solid Q-switched pulse laser fundamental frequency 1064nm laser is adopted as a pumping laser source by the pumping laser (1);
the Raman laser outputting the wavelength of 1.9 mu m comprises a Raman pool I (3-1), a window I (2-1), a window II (2-2), a 0-degree reflector I (4-1), a 0-degree reflector II (4-2), a dichroic mirror (5), a laser recoverer I (6-1) and a Pelin Brillock prism (7);
the first Raman tank (3-1) is a hollow tubular container, high-pressure hydrogen is filled in the container, and the air pressure range is between 0.01 and 10 MPa; the first window (2-1) and the second window (2-2) are respectively arranged at two ends of the first Raman cell (3-1), the second window (2-2) is positioned at one end close to the pump laser (1), and laser antireflection films corresponding to the pump laser and the Raman laser wavelength, namely 1064nm &1.9 mu mAR are plated on the surfaces of the two windows;
the first 0-degree reflecting mirror (4-1) and the second 0-degree reflecting mirror (4-2) are respectively arranged at two ends inside the first Raman cell (3-1), the first 0-degree reflecting mirror (4-1) and the first window (2-1) are oppositely arranged, and the second 0-degree reflecting mirror (4-2) and the second window (2-2) are oppositely arranged;
the dichroic mirror (5), the first laser recoverer (6-1) and the Pelin Brillock prism (7) are positioned outside the first Raman cell (3-1), wherein the Pelin Brillock prism (7) is positioned below the dichroic mirror (5), and the first laser recoverer (6-1) is positioned behind the dichroic mirror (5);
taking a central axis of a laser beam emitted by the pumping laser (1) as an axis, entering the Raman pond I (3-1) through a window II (2-2), carrying out twice reflection of the 0-degree reflector II (4-2), outputting the laser beam to the outside of the Raman pond I (3-1) after passing through the window I (2-1), carrying out light splitting through a dichroic mirror (5), transmitting laser with the wavelength of 1064nm, entering the laser recoverer I (6-1), carrying out reflection laser with the wavelength of 1.9 mu m, entering the Pelin Buloka prism (7), and carrying out reflection of the laser with the wavelength of 1.9 mu m, wherein the propagation direction of the laser is deflected by 90 degrees after passing through the Pelin Buloka prism (7);
the Raman laser outputting the wavelength of 9.2 mu m comprises a Raman pond II (3-2), a window III (2-3), a window IV (2-4), a laser recoverer II (6-2), a laser recoverer III (6-3), a focusing lens I (8-1), a focusing lens II (8-2), a Herroitt concave mirror I (9-1) and a Herroitt concave mirror II (9-2);
the second Raman tank (3-2) is a hollow tubular container, high-pressure hydrogen is filled in the second Raman tank, and the hydrogen pressure is between 0.01 and 10 MPa; the window III (2-3) and the window IV (2-4) are respectively arranged at two ends of the Raman Chi Er (3-2), the window III (2-3) is positioned at one end close to the Pelin Brillock prism (7), and laser antireflection films corresponding to the wavelengths of pumping laser and the Raman laser, namely 1.9 mu m &9.2 mu mAR are plated on the surfaces of the two windows;
the first focusing lens (8-1) is positioned outside the Raman Chi Er (3-2), is arranged on the incidence side of the laser beam of the third window (2-3), and is coaxial with the laser beam; the second focusing lens (8-2) is positioned in the second Raman cell (3-2), is arranged on the incidence side of the laser beam of the fourth window (2-4), and is coaxial with the laser beam;
the Herroitt concave mirror I (9-1) and the Herroitt concave mirror II (9-2) are respectively arranged at two ends inside the Raman cell II (3-2), the Herroitt concave mirror I (9-1) is opposite to the window III (2-3), and is confocal to the focusing lens I (8-1), the Herroitt concave mirror II (9-2) is opposite to the window IV (2-4), and is confocal to the focusing lens II (8-2); the concave surfaces of the Herroitt concave mirror I (9-1) and the Herroitt concave mirror II (9-2) are plated with a laser 0-degree high-reflection film with the thickness of 1.9 mu m and 9.2 mu m, and the Herroitt concave mirror I and the Herroitt concave mirror II have high transmission capacity for 2.1 mu m laser, and filter out 2.1 mu m laser generated in stimulated Raman scattering;
the second laser recoverer (6-2) and the third laser recoverer (6-3) are respectively positioned in the second Raman cell (3-2), and are respectively arranged on one side of the second Herroitt concave reflecting mirror (9-2) and the first Herroitt concave reflecting mirror (9-1) from which 2.1 mu m laser is filtered out for recovering and consuming 2.1 mu m wavelength laser;
the laser beam reflected by the Pelin Brillock prism (7) enters a Raman pond II (3-2) after passing through a focusing lens I (8-1) and a window III (2-3), in the Raman pond II (3-2), the laser beam irradiates onto a Herroitt concave mirror I (9-1), 1.9 mu m and 9.2 mu m lasers are reflected to a Herroitt concave mirror II (9-2) through the reflection of the Herroitt concave mirror I (9-1), then reflected by the Herroitt concave mirror II (9-2), and the laser beam sequentially passes through the focusing lens II (8-2) and the window IV (2-4) and then is output to the outside of a Raman Chi Er (3-2), and meanwhile, 2.1 mu m lasers enter a laser recycling device II (6-2) or a Herroitt concave mirror III (6-3) after passing through the Herroitt concave mirror I (9-1) or the Herroitt concave mirror II (9-2) and are consumed by the laser recycling device III;
the focal length of the first focusing lens (8-1) and the second focusing lens (8-2) is matched with the length of the second Raman cell (3-2) and the curvatures of the first Herroitt concave reflecting mirror (9-1) and the second Herroitt concave reflecting mirror (9-2); the laser is focused through the first focusing lens (8-1), focused into the Raman medium, reflected by the first Herroitt concave mirror (9-1), focused again, irradiated onto the second Herroitt concave mirror (9-2), focused again by the second Herroitt concave mirror (9-2), and focused three times in total in the Raman cell (3-2).
2. An apparatus for realizing mid-infrared laser output of 9.2 μm by stimulated raman scattering according to claim 1, wherein the raman laser beam quality optimization is realized by adjusting the air pressure in raman cell one (3-1), the air pressure in raman Chi Er (3-2), the curvatures of the focusing lens and the Herroitt concave mirror, and the raman cell two (3-2) length.
3. A method for achieving a mid-infrared laser output of 9.2 μm by stimulated raman scattering according to claim 1 or 2, characterized in that the method comprises the steps of:
step one, filling hydrogen into a first Raman tank (3-1) and a second Raman tank Chi Er (3-2) respectively;
step two, an optical path is regulated, so that a 1064nm wavelength laser beam output by the pumping laser (1) is led into the Raman cell I (3-1) through the window II (2-2), and the laser beam is output to the outside of the Raman cell I (3-1) through the window II (2-1) after being reflected for a plurality of times by the 0-degree reflecting mirror I (4-1) and the 0-degree reflecting mirror II (4-2) in the Raman cell I (3-1);
step three, the output 1064nm laser and the generated 1.9 mu m Raman laser are filtered by a dichroic mirror (5), the 1.9 mu m Raman laser is reflected, and the remaining 1064nm laser is transmitted and enters a first laser recoverer (6-1); 1.9 mu m Raman laser enters a Raman laser with 9.2 mu m wavelength output after being folded by a dichroic mirror (5) and a Pelin Brillock prism (7);
step four, the Raman laser of 1.9 mu m reflected by the Pelin Brillock prism (7) enters a Raman pond II (3-2) and is focused after passing through a focusing lens I (8-1) and a window III (2-3), and is output to the outside of a Raman Chi Er (3-2) after passing through a focusing lens II (8-2) and a window IV (2-4) after passing through two Herroitt concave reflectors for twice, and the laser beam is refocused after passing through the Herroitt concave reflectors each time, so that three times of focusing are realized in the Raman pond II (3-2); during the period, after the rotation Raman 2.1 μm laser generated by the 1.9 μm laser is filtered by the two Herroitt concave reflectors and the recovery consumption of the two laser recoverers, the dual-wavelength laser of 1.9 μm and 9.2 μm is remained to be reflected and focused in the Raman Chi Er (3-2), and finally the 9.2 μm mid-infrared laser is obtained.
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