Gas stimulated Raman frequency conversion device with double-gas-chamber structure design

Abstract

The application belongs to the field of laser frequency conversion, and particularly relates to a gas stimulated Raman frequency conversion device with a double-gas-chamber structure, wherein a pump laser source, a 45-degree mirror and a focusing lens are arranged outside a Raman cell A, two ends of the Raman cell A are respectively provided with a Raman cell window A and a Raman cell window C, the inside of the Raman cell A is provided with a Raman cell B, one end of the Raman cell B is connected with one end of the Raman cell A and shares the Raman cell window A, and the other end of the Raman cell B is provided with a Raman cell window B; one end of the Raman cell A in the length direction is provided with a plane mirror located below the Raman cell B, the other end of the Raman cell A in the length direction is provided with a concave mirror and a plane mirror, and the concave mirror and the plane mirror at the end are arranged in the up-down direction along the height direction of the Raman cell A.

Description

Technical Field

[0001] This invention belongs to the field of laser frequency conversion, specifically a gas-stimulated Raman frequency conversion device with a dual-chamber structure design. It is applied in the field of lidar for detecting atmospheric composition, and can also be applied to other related fields with special requirements for laser output wavelength. Background Technology

[0002] Ultraviolet differential lidar is a powerful tool for detecting atmospheric ozone. This lidar requires a dual-wavelength output laser, which uses the backscattered signals of the two wavelengths emitted in the atmosphere to perform differential calculations to obtain the concentration of ozone in the atmosphere. A 266nm wavelength laser can be used as the pump source, and the laser wavelength required by the ozone radar can be obtained through stimulated Raman conversion. Stimulated Raman conversion is a laser frequency conversion method, especially gas medium stimulated Raman conversion, which has the advantages of low cost, ability to withstand high peak power pulsed laser pumping, and no damage to the conversion medium. Therefore, gas medium stimulated Raman conversion technology has important applications in certain specific fields. Summary of the Invention

[0003] The purpose of this invention is to provide a gas-stimulated Raman frequency conversion device with a dual-chamber structure. The high-pressure gas in the Raman cell is pumped by a 266nm wavelength ultraviolet laser, which is a fourth-harmonic generation of an Nd:YAG solid-state laser, to achieve multi-wavelength output of ultraviolet Raman laser. The use of multi-wavelength ultraviolet laser can realize the detection and quantitative analysis of the distribution of some harmful gases in the atmosphere.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] This invention includes a pump laser source, a wavelength converter, and a gas filling system. The wavelength converter includes a 45-degree reflector, a focusing lens, a Raman cell A, a Raman cell B, a concave reflector, and a plane reflector. The pump laser source, the 45-degree reflector, and the focusing lens are all disposed outside the Raman cell A. Raman cell A has Raman cell windows A and C at its two ends, respectively. Raman cell B is disposed inside Raman cell A. One end of Raman cell B is connected to one end of Raman cell A and shares Raman cell window A. The other end of Raman cell B has a Raman cell window B. A plane reflector located below Raman cell B is disposed at one end of the Raman cell A along its length. A concave reflector and a plane reflector are disposed at the other end of the Raman cell A along its length. The concave reflector and the plane reflector at that end are vertically aligned along the height of Raman cell A. The gas filling system includes at least one Raman active... The system includes a gas cylinder and at least one inert gas cylinder. The Raman active gas cylinder and the inert gas cylinder are respectively connected to the interior of Raman cell A via gas pipelines. Valves are provided on the gas pipelines connecting the Raman active gas cylinder to Raman cell A and the inert gas cylinder to Raman cell A. High-pressure gas is introduced into Raman cell A through the Raman active gas cylinder or both the Raman active gas cylinder and the inert gas cylinder. The pump laser emitted by the pump laser source is reflected by a 45-degree mirror, passes through a focusing lens, and enters Raman cell B through Raman cell window A. It is focused in Raman cell B, then passes through Raman cell window B and enters Raman cell A. It is reflected by a concave mirror, then alternately reflected by plane mirrors at both ends of Raman cell A, and finally output to the outside of Raman cell A after passing through Raman cell window C. The pump laser in Raman cell A and Raman cell B achieves wavelength conversion during the reflection process.

[0006] Wherein: the pump laser source is a pump laser, the pump laser emits a laser beam, and with the central axis of the laser beam emitted by the pump laser as the axis, the beam is reflected by the 45-degree reflecting mirror, passes through the focusing lens, and then enters the Raman cell B through the Raman cell window A; or, the pump laser source can be any one of the lasers in the ultraviolet, visible, and infrared bands.

[0007] The pump laser is a 1064nm wavelength solid-state Nd:YAG laser, a fourth-frequency harmonic laser, or a 266nm laser.

[0008] The pump laser source is a fiber laser. A lens is provided in the optical path between the fiber laser and the 45-degree reflector. The diverging light emitted by the fiber laser is shaped into a parallel or nearly parallel laser beam by the lens. After being reflected by the 45-degree reflector, the shaped laser passes through the focusing lens and enters the Raman cell B through the Raman cell window A.

[0009] There are two 45-degree reflectors, namely 45-degree reflector A and 45-degree reflector B. 45-degree reflector B is located below 45-degree reflector A and is set perpendicular to 45-degree reflector A.

[0010] The surfaces of Raman cell windows A, B, and C are all coated with laser antireflection films corresponding to the pump laser and Raman laser wavelengths.

[0011] Both Raman cell A and Raman cell B are hollow tubular containers, with their lengths aligned. Raman cell A is divided into two chambers by a Raman cell window B, each filled with high-pressure gas. Raman cell A is equipped with a pressure gauge A for reading the gas pressure inside Raman cell A and a gas release valve A for reducing the gas pressure inside Raman cell A. Similarly, Raman cell B is equipped with a pressure gauge B for reading the gas pressure inside Raman cell B and a gas release valve B for reducing the gas pressure inside Raman cell B.

[0012] The Raman active gas cylinders are multiple, including hydrogen cylinders, deuterium cylinders, methane cylinders, and carbon dioxide cylinders. Each hydrogen cylinder has a hydrogen valve on its gas pipeline connecting it to Raman cell A, each deuterium cylinder has a deuterium valve on its gas pipeline connecting it to Raman cell A, each methane cylinder has a methane valve on its gas pipeline connecting it to Raman cell A, and each carbon dioxide cylinder has a carbon dioxide valve on its gas pipeline connecting it to Raman cell A. One or more of the hydrogen, deuterium, methane, and carbon dioxide cylinders fill Raman cell A with high-pressure gas, and one or more of the inert gas cylinders fill Raman cell A with high-pressure gas.

[0013] The planar reflector includes planar reflector A, planar reflector B, and planar reflector C. Planar reflector A and planar reflector C are located at one end of the Raman cell A along its length, arranged sequentially from top to bottom, and are located below the Raman cell B. Planar reflector B is located at the other end of the Raman cell A along its length, and is located below the concave reflector. The pump laser, after being reflected by the 45-degree reflector, passes through the focusing lens, enters the Raman cell B through the Raman cell window A, then enters the Raman cell A again after passing through the Raman cell window B, and then passes through the concave reflector, planar reflector A, planar reflector B, and planar reflector C in sequence, and finally exits to the outside of the Raman cell A after passing through the Raman cell window C.

[0014] The focal length of the focusing lens is matched with the length of the Raman cell B, and the curvature of the concave mirror is 1m. The focusing lens and the concave mirror are placed cofocally. The laser is first focused by the focusing lens and then focused into the Raman medium. After being reflected by the concave mirror, the laser is transformed again into a parallel or nearly parallel laser beam.

[0015] The advantages and positive effects of this invention are as follows:

[0016] 1. This invention employs a design with two Raman cells, one of which is embedded within the other. This design can reduce the Raman threshold of the gas with weaker gain and improve the quality of the Raman laser beam.

[0017] 2. This invention adopts a long optical path gas Raman frequency conversion structure design, which reduces the length of the frequency conversion device and facilitates assembly, thus providing support for the miniaturization and convenience of this type of ultraviolet ozone lidar; moreover, this invention reduces the threshold of stimulated Raman scattering and improves the conversion efficiency of Raman laser.

[0018] 3. By changing the ratio of one or more Raman media, this invention can control the conversion efficiency, output power, or single-pulse energy of two Raman lasers with different wavelengths.

[0019] 4. This invention can realize wavelength conversion of lasers.

[0020] 5. The device of the present invention is inexpensive to manufacture, has a simple structure, and is easy to operate. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Wherein: 1 is the pump laser, 2 is the 45-degree reflector A, 3 is the 45-degree bottom reflector B, 4 is the focusing lens, 5 is the Raman cell A, 6 is the Raman cell B, 7 is the Raman cell window A, 8 is the Raman cell window B, 9 is the Raman cell window C, 10 is the concave reflector, 11 is the plane reflector A, 12 is the plane reflector B, 13 is the gas release valve A, 14 is the pressure gauge A, 15 is the gas release valve B, 16 is the pressure gauge B, 17 is the hydrogen valve, 18 is the hydrogen cylinder, 19 is the argon valve, 20 is the argon cylinder, 21 is the deuterium valve, 22 is the deuterium cylinder, and 23 is the plane reflector C. Detailed Implementation

[0023] The invention will now be described in further detail with reference to the accompanying drawings.

[0024] like Figure 1As shown, the present invention includes a pump laser source, a wavelength converter, and a gas filling system. The wavelength converter includes a 45-degree reflector, a focusing lens 4, a Raman cell A5, a Raman cell B6, a concave reflector 10, and a plane reflector. The pump laser source, the 45-degree reflector, and the focusing lens 4 are all disposed outside the Raman cell A5. Raman cell A5 has Raman cell windows A7 and C9 at its two ends, respectively. Raman cell B6 is disposed inside Raman cell A5. One end of Raman cell B6 is connected to one end of Raman cell A5 and shares Raman cell window A7. The other end of Raman cell B6 has a Raman cell window B8. A section located below Raman cell B6 is provided at one end of the Raman cell A5 along its length. The Raman cell A5 has a concave reflector 10 and a flat reflector at the other end along its length. The concave reflector 10 and the flat reflector at that end are arranged vertically along the height direction of the Raman cell A5. The gas filling system includes at least one Raman active gas cylinder and at least one inert gas cylinder. The Raman active gas cylinder and the inert gas cylinder are respectively connected to the interior of the Raman cell A5 through gas pipelines. Valves are provided on the gas pipelines between the Raman active gas cylinder and the Raman cell A5, and on the gas pipelines between the inert gas cylinder and the Raman cell A5. The Raman active gas cylinder or the Raman active gas cylinder and the inert gas cylinder are filled with high-pressure gas into the Raman cell A5. The Raman cell B6 is also filled with high-pressure gas. The pump laser emitted by the pump laser source is reflected by a 45-degree mirror, passes through a focusing lens 4, and enters Raman cell B6 through Raman cell window A7. It is focused in Raman cell B6, then passes through Raman cell window B8 into Raman cell A5. It is reflected by a concave mirror 10, and then alternately reflected by the plane mirrors at both ends of Raman cell A5. Finally, it is output to the outside of Raman cell A5 after passing through Raman cell window C9. The pump laser in Raman cell A5 and Raman cell B6 achieves wavelength conversion during the reflection process.

[0025] In this embodiment, the pump laser source is pump laser 1, which uses a 1064nm wavelength solid-state Nd:YAG laser with fourth frequency harmonication and a 266nm laser as the pump laser. This embodiment has two 45-degree reflectors: 45-degree reflector A2 and 45-degree reflector B3. 45-degree reflector B3 is located below and perpendicular to 45-degree reflector A2. Pump laser 1 emits a laser beam, which, with the central axis of the emitted laser beam as its axis, is reflected by 45-degree reflectors A2 and B3, passes through focusing lens 4, and then enters Raman cell B6 through Raman cell window A7. Alternatively, the pump laser source can be any type of laser in the ultraviolet, visible, or infrared bands. Alternatively, the pump laser source is a fiber laser. A lens is installed in the optical path between the fiber laser and the 45-degree reflector A2. The divergent light emitted by the fiber laser is shaped into a parallel or nearly parallel laser beam by the lens. After being reflected by the 45-degree reflector A2 and the 45-degree reflector B3, the laser passes through the focusing lens 4 and then enters the Raman cell B6 through the Raman cell window A7.

[0026] In this embodiment, Raman cells A5 and B6 are hollow tubular containers, with their lengths aligned. Both cells can withstand high pressure. Raman cell A5 is divided into two chambers by Raman cell window B8, each filled with high-pressure gas. These separated chambers can be filled with gases of different compositions or withstand different pressures. The surfaces of Raman cell windows A5, B6, and C9 are coated with anti-reflection coatings corresponding to the pump laser and Raman laser wavelengths. Raman cell A5 is equipped with a pressure gauge A14 for reading the gas pressure and a gas release valve A13 for reducing the gas pressure. Similarly, Raman cell B6 is equipped with a pressure gauge B16 for reading the gas pressure and a gas release valve B15 for reducing the gas pressure.

[0027] In this embodiment, there are multiple Raman active gas cylinders, including a hydrogen cylinder 18, a deuterium cylinder 22, a methane cylinder, and a carbon dioxide cylinder. A hydrogen valve 17 is installed on the gas pipeline connecting the hydrogen cylinder 18 to the Raman cell A5; a deuterium valve 21 is installed on the gas pipeline connecting the deuterium cylinder 22 to the Raman cell A5; a methane valve is installed on the gas pipeline connecting the methane cylinder to the Raman cell A5; and a carbon dioxide valve is installed on the gas pipeline connecting the carbon dioxide cylinder to the Raman cell A5. The hydrogen cylinder 18, deuterium cylinder 22, and methane cylinder... One of the carbon dioxide cylinders can be used to individually fill the Raman cell A5 with high-pressure gas, or multiple cylinders of hydrogen 18, deuterium 22, methane, and carbon dioxide can be used to fill the Raman cell A5 with a high-pressure mixed gas. An inert gas cylinder and one or more of the hydrogen 18, deuterium 22, methane, and carbon dioxide cylinders can also be used to fill the Raman cell A5 with high-pressure gas. In this embodiment, the inert gas cylinder is an argon cylinder 20, and an argon valve 19 is provided on the gas pipeline connecting the argon cylinder 20 to the Raman cell A5. The gas concentration and the ratio of different gas components inside the Raman cell A5 can be adjusted by coordinating the hydrogen valve 17, argon valve 19, deuterium valve 21, methane valve, carbon dioxide valve, and gas release valve A13. The high-pressure gas filled into the Raman cell B6 can be a Raman active gas or a mixture of a Raman active gas and an inert gas.

[0028] The planar reflectors in this embodiment include planar reflectors A11, B12, and C23. Planar reflectors A11 and C23 are located at one end of the Raman cell A5 along its length, arranged sequentially from top to bottom, and are located below Raman cell B6. Planar reflector B12 is located at the other end of the Raman cell A5 along its length, and is located below concave reflector 10. After being reflected by 45-degree reflectors A2 and B3, the pump laser passes through focusing lens 4, enters Raman cell B6 through Raman cell window A7, then enters Raman cell A5 through Raman cell window B8, and then passes through concave reflector 10, planar reflector A11, planar reflector B12, and planar reflector C23 in sequence, and is finally output to the outside of Raman cell A5 after passing through Raman cell window C9. The concave reflector 10, plane reflector A11, plane reflector B12, and plane reflector C23 installed inside the Raman cell A5 achieve a long optical path effect. The pump laser is reflected between the reflectors, extending the interaction length between the laser and the Raman medium. The number of plane reflectors inside the Raman cell A5 can be increased or decreased.

[0029] In this embodiment, the focal length of the focusing lens 4 must match the length of the Raman cell B6. For example, a Raman cell A5 with a length of 1.3m and a Raman cell B6 with a length of 0.9m require a focusing lens 4 with a focal length of 0.5m. Simultaneously, the curvature of the concave mirror 10 is 1m. During placement, the focusing lens 4 and the concave mirror 10 should be placed confocally. The laser is first focused by the focusing lens 4, and then reflected by the concave mirror 10, transforming the laser beam into a parallel or nearly parallel laser beam. By selecting the parameters of the focusing lens 4 and the concave mirror 10, laser beam contraction and expansion can also be achieved. For example, using a focusing lens 4 with a focal length of 0.8m and a concave mirror 10 with a curvature of 0.8m, the combination of the focusing lens 4 and the concave mirror 10 can achieve a 0.5x beam contraction of the pump laser.

[0030] Experimental Example 1

[0031] In application, this invention uses a solid-state Nd:YAG laser with an output wavelength of 266nm to pump a mixture of hydrogen and deuterium gas at frequency four times to generate Raman lasers at 289nm and 299nm.

[0032] Step 1: Fill the Raman cell B6 with deuterium gas at 0.3 MPa;

[0033] Step 2: Through the coordination of gas release valve A13, pressure gauge A14, and each gas cylinder, a mixture of hydrogen and deuterium with a gas molecule ratio of 1 / 3 is produced, with a total gas pressure of 3 MPa.

[0034] Step 3: Inject a 266nm wavelength pump laser into Raman cell A5, and output it outside Raman cell A5 after wavelength conversion;

[0035] Step 4: Use a spectrometer to collect the output Raman laser, disperse the Raman laser using a dispersive element, and then collect the data.

[0036] Experimental Example 2

[0037] Based on research, this invention uses commercially available IPG fiber laser as the pump laser source with a wavelength of 1070nm. After the IPG fiber laser is emitted, it is shaped by a lens. The shaped laser is then reflected by 45-degree mirrors A2 and B3, passes through focusing lens 4, and is then injected into Raman cell B6.

[0038] By filling Raman cell B6 with methane and hydrogen, Raman lasers with wavelengths of 1926nm, 1555nm, and 2847nm can be obtained.

[0039] Experiment Example 3

[0040] In application, this invention utilizes a 266nm solid-state Nd:YAG laser with fourth-harmonic output to pump a mixture of hydrogen and deuterium gas, generating Raman lasers at 289nm and 299nm. The implementation process can be described as follows: using the 266nm laser as the pump laser, and filling the Raman cell A5 with hydrogen, deuterium, and helium, the gas composition ratio inside Raman cell A5 can be flexibly controlled through the coordination of gas cylinders and valves, achieving a change in the output ratio of 287nm and 299nm wavelengths.

[0041] This invention differs from existing ultraviolet laser Raman frequency conversion schemes. Through a special structural design, it reduces the number of Raman cells required, allowing different gas media to be filled into a single Raman cell. This enables miniaturization of the gas Raman frequency conversion device and simplifies the structure of the laser frequency conversion device. The invention employs a long optical path structure design, which improves frequency conversion efficiency. By directly connecting to multiple gas cylinders, the content of different gas components can be precisely controlled, allowing for the adjustment of the energy ratio of different wavelength components.

[0042] Different types of gas molecules exhibit different Raman gains. By controlling the gas concentration and the proportion of different gas types in the Raman cell, the gain coefficients for different wavelengths can be determined. This technique allows for precise control of the composition and proportion of different wavelengths in the output spectrum of multi-wavelength lasers.

Claims

1. A gas-stimulated Raman frequency converter with a dual-chamber structure design, characterized in that: The system includes a pump laser source, a wavelength converter, and a gas filling system. The wavelength converter includes a 45-degree reflector, a focusing lens (4), a Raman cell A (5), a Raman cell B (6), a concave reflector (10), and a plane reflector. The pump laser source, the 45-degree reflector, and the focusing lens (4) are all located outside the Raman cell A (5). Raman cell A (5) has Raman cell windows A (7) and C (9) at its two ends, respectively. Raman cell B (6) is located inside the Raman cell A (5). One end of the 6) is connected to one end of the Raman cell A (5) and shares the Raman cell window A (7), and the other end of the Raman cell B (6) is provided with a Raman cell window B (8); one end of the Raman cell A (5) in the length direction is provided with a plane mirror located below the Raman cell B (6), and the other end of the Raman cell A (5) in the length direction is provided with a concave mirror (10) and a plane mirror, and the concave mirror (10) and the plane mirror at this end are arranged vertically along the height direction of the Raman cell A (5); the gas filling system includes At least one Raman active gas bottle and at least one inert gas bottle are provided. The Raman active gas bottle and the inert gas bottle are respectively connected to the interior of Raman cell A (5) through gas pipelines. Valves are provided on the gas pipelines between the Raman active gas bottle and Raman cell A (5) and between the inert gas bottle and Raman cell A (5). High-pressure gas is filled into Raman cell A (5) by the Raman active gas bottle or the Raman active gas bottle and the inert gas bottle. The pump laser emitted by the pump laser source is reflected by a 45-degree mirror and passes through the focusing... The laser beam is focused by the focal lens (4) and then enters the Raman cell B (6) through the Raman cell window A (7). It is then focused in the Raman cell B (6), passes through the Raman cell window B (8) and enters the Raman cell A (5). It is reflected by the concave mirror (10), and then alternately reflected by the plane mirrors at both ends of the Raman cell A (5). Finally, it is output to the outside of the Raman cell A (5) after passing through the Raman cell window C (9). The pump laser in the Raman cell A (5) and the Raman cell B (6) realizes the change of laser wavelength during the reflection process. There are two 45-degree reflectors, namely 45-degree reflector A (2) and 45-degree reflector B (3). 45-degree reflector B (3) is located below 45-degree reflector A (2) and is set perpendicular to 45-degree reflector A (2). The planar reflector includes planar reflector A (11), planar reflector B (12) and planar reflector C (23). Planar reflector A (11) and planar reflector C (23) are located at one end of the length direction inside Raman cell A (5) and are arranged sequentially from top to bottom, and are located below Raman cell B (6). Planar reflector B (12) is located at the other end of the length direction inside Raman cell A (5) and is located below concave reflector (10). After being reflected by the 45-degree reflector, the pump laser passes through the focusing lens (4), enters Raman cell B (6) through Raman cell window A (7), and then enters Raman cell A (5) through Raman cell window B (8). After being reflected by the concave reflector (10), planar reflector A (11), planar reflector B (12) and planar reflector C (23) in sequence, it is finally output to the outside of Raman cell A (5) after passing through Raman cell window C (9). The focal length of the focusing lens (4) matches the length of the Raman cell B (6), and the curvature of the concave mirror (10) is 1m. The focusing lens (4) and the concave mirror (10) are placed cofocally. The laser is first focused by the focusing lens (4), and the laser is focused into the Raman medium. After being reflected by the concave mirror (10), the laser is transformed into a parallel laser beam or a nearly parallel laser beam. The Raman active gas cylinders are multiple, including a hydrogen cylinder (18), a deuterium cylinder (22), a methane cylinder, and a carbon dioxide cylinder. A hydrogen valve (17) is provided on the gas pipeline connecting the hydrogen cylinder (18) to the Raman cell A (5). A deuterium valve (21) is provided on the gas pipeline connecting the deuterium cylinder (22) to the Raman cell A (5). A methane valve is provided on the gas pipeline connecting the methane cylinder to the Raman cell A (5). A carbon dioxide valve is provided on the gas pipeline connecting the carbon dioxide cylinder to the Raman cell A (5). One or more of the hydrogen cylinder (18), deuterium cylinder (22), methane cylinder, and carbon dioxide cylinder fill the Raman cell A (5) with high-pressure gas. One or more of the inert gas cylinders and one or more of the hydrogen cylinder (18), deuterium cylinder (22), methane cylinder, and carbon dioxide cylinder fill the Raman cell A (5) with high-pressure gas.

2. The gas-stimulated Raman frequency converter with a dual-chamber structure design according to claim 1, characterized in that: The pump laser source is a pump laser (1), which emits a laser beam. The laser beam emitted by the pump laser (1) is reflected by the 45-degree mirror, passes through the focusing lens (4), and enters the Raman cell B (6) through the Raman cell window A (7). Alternatively, the pump laser source can be any type of laser in the ultraviolet, visible, and infrared bands.

3. The gas-stimulated Raman frequency converter with a dual-chamber structure design according to claim 2, characterized in that: The pump laser (1) uses a 1064 nm wavelength solid-state Nd:YAG laser, a fourth-frequency harmonic laser, and a 266 nm laser as the pump laser.

4. The gas-stimulated Raman frequency converter with a dual-chamber structure design according to claim 1, characterized in that: The pump laser source is a fiber laser. A lens is provided in the optical path between the fiber laser and the 45-degree reflector. The divergent light emitted by the fiber laser is shaped into a parallel or nearly parallel laser beam by the lens. After being reflected by the 45-degree reflector, the laser beam passes through the focusing lens (4) and then enters the Raman cell B (6) through the Raman cell window A (7).

5. The gas-stimulated Raman frequency converter with a dual-chamber structure design according to claim 1, characterized in that: The surfaces of Raman cell window A (5), Raman cell window B (6) and Raman cell window C (9) are all coated with laser antireflection films corresponding to the pump laser and Raman laser wavelengths.

6. The gas-stimulated Raman frequency converter with a dual-chamber structure design according to claim 1, characterized in that: Both Raman cell A (5) and Raman cell B (6) are hollow tubular containers. The length directions of Raman cell A (5) and Raman cell B (6) are the same. The interior of Raman cell A (5) is separated into two gas chambers by Raman cell window B (8). Each gas chamber is filled with high-pressure gas. A pressure gauge A (14) for reading the gas pressure in Raman cell A (5) and a gas release valve A (13) for reducing the gas pressure in Raman cell A (5) are installed on Raman cell A (5). A pressure gauge B (16) for reading the gas pressure in Raman cell B (6) and a gas release valve B (15) for reducing the gas pressure in Raman cell B (6) are installed on Raman cell B (6).

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