CN114188801B - Flowing gas stimulated Raman scattering frequency conversion device - Google Patents
Flowing gas stimulated Raman scattering frequency conversion device Download PDFInfo
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- CN114188801B CN114188801B CN202010959346.XA CN202010959346A CN114188801B CN 114188801 B CN114188801 B CN 114188801B CN 202010959346 A CN202010959346 A CN 202010959346A CN 114188801 B CN114188801 B CN 114188801B
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- 238000001069 Raman spectroscopy Methods 0.000 title claims abstract description 90
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 38
- 230000003287 optical effect Effects 0.000 claims abstract description 61
- 238000002955 isolation Methods 0.000 claims abstract description 52
- 238000005086 pumping Methods 0.000 claims description 10
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000017525 heat dissipation Effects 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 57
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000005350 fused silica glass Substances 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000003667 anti-reflective effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/30—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
- H01S3/305—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 in a gas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/03—Constructional details of gas laser discharge tubes
- H01S3/034—Optical devices within, or forming part of, the tube, e.g. windows, mirrors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/03—Constructional details of gas laser discharge tubes
- H01S3/036—Means for obtaining or maintaining the desired gas pressure within the tube, e.g. by gettering, replenishing; Means for circulating the gas, e.g. for equalising the pressure within the tube
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1026—Controlling the active medium by translation or rotation, e.g. to remove heat from that part of the active medium that is situated on the resonator axis
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/104—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation in gas lasers
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- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The invention relates to the technical field of Raman lasers, in particular to a flowing gas stimulated Raman scattering frequency conversion device, wherein one side of a gas circulation main pipeline is provided with a gas flow driving section, the other side of the gas circulation main pipeline is provided with a light passing section, one end of the light passing section is coaxially connected with a first light guide arm, the other end of the light passing section is coaxially connected with a second light guide arm, one end of the first light guide arm, which is far away from the light passing section, is provided with a laser input cavity mirror, one end of the second light guide arm, which is connected with the light passing section, is provided with a second isolation optical window, one end, which is far away from the light passing section, is provided with a laser output cavity mirror, the first isolation optical window and the second isolation optical window are symmetrically arranged and are inclined outwards, one end of the gas circulation main pipeline is provided with a first guide balance pipe which is communicated with the first light guide arm, and the other end of the gas circulation main pipeline is provided with a second guide balance pipe which is communicated with the second guide balance pipe. The invention ensures heat dissipation and reduces the conditions of deflection distortion and the like of the light path, and can be used for Raman frequency conversion of high-power or high-repetition-frequency laser.
Description
Technical Field
The invention relates to the technical field of Raman lasers, in particular to a flowing gas stimulated Raman scattering frequency conversion device.
Background
The stimulated Raman scattering technology is a common laser frequency conversion method, and has the advantages that the device is simple in design and convenient to debug, the stimulated Raman mediums can be selected to be various, the spectrum movement ranges of different Raman mediums to pump laser are different, for example, solids can generate movement of hundreds of wave numbers, and gas Raman mediums can generate frequency shift of thousands of wave numbers, so that the conversion span of Raman frequency conversion is larger, and the variable wavelength is rich.The Raman medium commonly used at present is a crystal (such as diamond, srWO 4 ) Liquid (e.g.: h 2 O，CS 2 ，C 6 H 6 ) And gases (e.g.: h 2 ，CH 4 ) The stimulated Raman produced by the gas Raman medium has large stimulated Raman frequency shift and low damage threshold, and can be used for wavelength conversion of high-power laser, so that the gas Raman medium has wide application in various fields.
In the raman conversion device using the gas medium, the thermal effect generated at the laser focusing position can be diffused along with the movement of the gas molecules, so that the performance of the raman conversion device can be kept stable within a certain repetition frequency range. However, when the heat generated in the stimulated raman conversion process is more or the repetition frequency of the laser used is higher, the heat generated at the focusing position of the laser may not be timely diffused, so that the raman conversion efficiency is reduced, the light beam drifts or heat distortion is generated, and other adverse consequences are caused, and the reasons include uneven gas density (such as thermal lens effect) in the raman tank caused by the thermal effect, or local vortex generated by the disordered flow of gas molecules caused by the temperature difference. This results in stimulated raman scattering frequency conversion devices that can only operate at lower repetition rates or are not suitable for raman conversion of higher power lasers.
Disclosure of Invention
The invention aims to provide the stimulated Raman scattering frequency conversion device for flowing gas, which enables Raman medium to circularly flow and a light passing section in a flowing pipeline to keep a better laminar state, and reduces the conditions of deflection distortion and the like of optical paths of pumping laser and Raman laser caused by uneven airflow or vortex while guaranteeing effective heat dissipation, so that the device can be used for Raman frequency conversion of high-power or higher-repetition-frequency laser.
The aim of the invention is realized by the following technical scheme:
the utility model provides a flowing gas stimulated Raman scattering variable frequency device, includes gas circulation main line, air current drive arrangement, first light guide arm and second light guide arm, gas circulation main line is airtight pipeline and one side is air current drive section, opposite side is logical light section, the air current drive section is equipped with air current drive arrangement, logical light section one end and first light guide arm coaxial coupling, the other end and second light guide arm coaxial coupling, first light guide arm is kept away from logical light section one end is equipped with laser input chamber mirror, connects logical light section one end is equipped with first isolation optical window, second light guide arm is connected logical light section one end is equipped with the second isolation optical window, keeps away from logical light section one end is equipped with laser output chamber mirror, first isolation optical window and second isolation optical window symmetry set up and all incline outwards gaseous circulation main line one end be equipped with first water conservancy diversion balance pipe with first light guide arm intercommunication, the other end is equipped with second water conservancy diversion balance pipe with second light guide arm intercommunication.
The gas circulation main pipeline comprises a gas flow driving section, a light passing section, a bent pipe section and a connecting section, wherein the end part of the gas flow driving section and the end part of the light passing section are respectively connected with the corresponding end parts of the corresponding side connecting sections through the bent pipe section.
One end of the first flow guide balance pipe, which is far away from the first light guide arm, is connected with a bent pipe section adjacent to the same side, and one end of the second flow guide balance pipe, which is far away from the second light guide arm, is connected with a bent pipe section adjacent to the same side.
The included angle between the first isolation optical window and the vertical direction and the included angle between the second isolation optical window and the vertical direction are alpha, and the alpha is 50-65 degrees.
The first isolation optical window and the second isolation optical window are thin optical elements with the thickness of less than 3 mm.
The laser input cavity mirror is a focusing lens, the two sides of the laser input cavity mirror are both plated with a pumping laser antireflection film and a Raman laser high-reflection film, and the two sides of the laser output cavity mirror are both plated with the pumping laser antireflection film and the Raman laser antireflection film.
The focal length of the laser input cavity mirror is f, the distance between the laser input cavity mirror and the laser output cavity mirror is L, and f and L are more than or equal to 0.45L and less than or equal to 0.6L.
The invention has the advantages and positive effects that:
1. according to the invention, the Raman medium circularly flows in the Raman frequency conversion device by utilizing the gas circulation structure, and the proper pipeline design is adopted, so that the light transmission section part of the gas circulation main pipeline, through which laser passes, is kept in a better laminar flow state, no or only a very small amount of vortex is generated, the pumping laser and the Raman laser pass in the gas laminar flow region while effective heat dissipation is ensured, and the deflection distortion of an optical path caused by uneven airflow or vortex is reduced, so that the Raman frequency conversion device can be used for Raman frequency conversion of high-power laser with higher repetition frequency.
2. The invention uses the diversion balance tube to ensure that the two sides of the corresponding isolation optical window are pressed consistently, and the two isolation optical windows adopt thin optical elements with the thickness of less than 3mm and are symmetrically prevented from inclining outwards, so as to reduce the deflection of the optical path caused by the optical window.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Wherein, 1 is the gas circulation main line, 101 is the air current drive section, 102 is the light-passing section, 103 is the bend section, 104 is the linkage segment, 2 is the air current drive arrangement, 3 is first water conservancy diversion balanced pipe, 4 is first light guide arm, 5 is laser input chamber mirror, 6 is first isolation optical window, 7 is the second isolation optical window, 8 is the second light guide arm, 9 is laser output chamber mirror, 10 is the balanced pipe of second water conservancy diversion.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, the present invention includes a gas circulation main pipeline 1, a gas flow driving device 2, a first light guiding arm 4 and a second light guiding arm 8, where the gas circulation main pipeline 1 is a closed pipeline, one side of the gas circulation main pipeline 1 is a gas flow driving section 101, the other side is a light passing section 102, the gas flow driving section 101 is provided with the gas flow driving device 2 for driving gas flow to circulate in the gas circulation main pipeline 1, the gas flow driving device 2 is a device capable of driving gas flow such as a fan, an axial fan or an air pump, one end of the light passing section 102 is coaxially connected with the first light guiding arm 4, the other end is coaxially connected with the second light guiding arm 8, one end of the first light guiding arm 4 is far away from the light passing section 102 and provided with a laser input cavity 5, one end of the light passing section 102 is connected with a first isolation optical window 6, one end of the second light passing section 102 is provided with a second isolation optical window 7, one end of the light passing section 102 is far away from the light passing section 102 and provided with a laser output cavity 9, and one end of the first isolation optical window 6 and the second isolation optical window 6 is symmetrically connected with the first light guiding arm 8 and the second light guiding arm 8 and is provided with a balance tube 10, which is symmetrically connected with the first light guiding arm 4 and the first light guiding arm and the second light guiding arm 8 and the balance tube is connected with the first light guiding arm 1.
As shown in fig. 1, the gas circulation main pipeline 1 includes a gas flow driving section 101, a light passing section 102, a bend section 103 and a connecting section 104, wherein the end of the gas flow driving section 101 and the end of the light passing section 102 are respectively connected with the corresponding end of the corresponding side connecting section 104 through the bend section 103, so as to form a closed circulation pipeline. The gas circulation main pipeline 1 is a hollow circular pipe, the inner wall is smooth and free of burrs or bulges, so that the gas flow field inside the pipeline is kept uniform, the light-transmitting section 102 part is kept in a better laminar state, and no or only a very small amount of vortex is generated. In addition, the gas circulation main pipeline 1 is provided with an inflatable port which can be opened and closed for inflating gas.
As shown in fig. 1, the end of the first flow guiding balance tube 3 away from the first light guiding arm 4 is connected to the bend section 103 adjacent to the same side, and the end of the second flow guiding balance tube 10 away from the second light guiding arm 8 is connected to the bend section 103 adjacent to the same side. The first diversion balance pipe 3 ensures that the air pressures at two sides of the first isolation optical window 6 are consistent, and the second diversion balance pipe 10 ensures that the air pressures at two sides of the second isolation optical window 7 are consistent, so that the first isolation optical window 6 and the second isolation optical window 7 are not pressurized.
As shown in fig. 1, the first and second isolation optical windows 6 and 7 are symmetrically disposed and each inclined to the outside, and a thin optical element having a thickness of <3mm is employed to reduce optical path deviation caused by the optical windows. The included angle between the first isolation optical window 6 and the vertical direction and the included angle between the second isolation optical window 7 and the vertical direction are alpha, and the alpha is 50-65 degrees.
As shown in fig. 1, the laser input cavity mirror 5 is a focusing lens, both sides of the focusing lens are coated with a pumping laser antireflection film and a raman laser high reflection film, and both sides of the laser output cavity mirror 9 are coated with a pumping laser antireflection film and a raman laser antireflection film. Both the antireflective film and the highly reflective film are well known in the art.
The focal length of the laser input cavity mirror 5 is f, the distance between the laser input cavity mirror 5 and the laser output cavity mirror 9 is L, f and L are required to meet the requirement that f is more than or equal to 0.45L and less than or equal to 0.6L, so that the laser is focused at the middle position of the light transmitting section 102 after being input through the laser input cavity mirror 5 and is subjected to stimulated Raman scattering under the action of high-pressure gas.
The working principle of the invention is as follows:
the invention designs a flowing gas stimulated Raman scattering frequency conversion device for radiating heat by using circulating air flow, which is designed to ensure that a light passing section 102 in a pipeline maintains a better laminar flow state, and reduces the optical path deflection distortion of pump laser and Raman laser caused by uneven air flow or vortex at the same time of ensuring effective heat radiation.
Embodiment one: based on flowing CO 2 And the stimulated Raman scattering frequency conversion device of the gas.
As shown in FIG. 1, CO at a pressure of 10atm 2 The gas is filled into a closed gas circulation main pipeline 1, and a gas flow driving device 2 is controlled to drive high-pressure CO 2 The gas flows clockwise, the gas flow enters the light-passing section 102 through the connecting section 104 on one side, and the gas flow enters the gas flow driving section 101 through the connecting section 104 on the other side after being output by the light-passing section 102, so that the circulating flow is formed. In this embodiment, the rotational speed of the air flow driving device 2 (fan) is controlled to control the air flow rate so as to adapt to different heat dissipation requirements, and the first flow guiding balance pipe 3 and the second flow guiding balance pipe 10 respectively communicate the air circulation main pipeline 1 with the first light guiding arm 4 and the second light guiding arm 8, so as to ensure that the compression of two sides of the first isolation optical window 6 is consistent and the compression of two sides of the second isolation optical window 7 is consistent.
In this embodiment, the first isolation optical window 6 and the second isolation optical window 7 are both fused silica plates with thickness of 2mm, and the included angle α between the first isolation optical window and the second isolation optical window is 57 degrees and symmetrically arranged to compensate for the deflection of light caused by the laser transmitted through the isolation windows, the laser input cavity mirror 5 is a fused silica planoconvex lens, the diameter of the laser input cavity mirror is d=25mm, the focal length of the laser input cavity mirror is 0.5m, both sides of the laser input cavity mirror are plated with 1064nm antireflection film and 1249nm high reflection film, both sides of the laser output lens 9 are fused silica plane mirrors, both sides of the laser output lens are plated with 1064nm antireflection film and 1249nm antireflection film, and the distance between the laser input cavity mirror 5 and the laser output cavity mirror 9 is 1m.
This embodiment employs Nd to output electro-optic Q: YAG pulse laser is used as pumping laser source, the output wavelength is 1064nm, the pulse width is 10ns, the single pulse energy of laser is 1J, the laser work repetition frequency is adjustable, the maximum is 20Hz, when in use, 1064nm pulse laser is incident into the first light guide arm 4 through the laser input cavity mirror 5, and is sequentially transmitted into the second light guide arm 8 after passing through the first isolation optical window 6, the light transmission section 102 and the second isolation optical window 7, and then is output through the laser output cavity mirror 9, wherein 1064nm laser is focused in the middle position of the light transmission section 102 after passing through the laser input cavity mirror 5 and is in high-pressure CO with the focus area 2 The action generates stimulated Raman scattering, 1029nm stimulated Raman scattering light is generated, and the stimulated Raman laser light and the rest 1064nm pump light are emitted through a laser output cavity mirror 9.
When the air flow driving device 2 does not rotate, the high-pressure CO in the air circulation main pipeline 1 2 When the repetition frequency of the laser is 1Hz, the embodiment can work normally and stably, the laser Raman conversion efficiency is not reduced along with time, and the output Raman laser beam is not dithered or deformed. When the repetition frequency of the laser is 2Hz, the embodiment can work normally and stably, the laser Raman conversion efficiency is not reduced with time, but the output Raman laser beam is slightly dithered and deformed. When the repetition frequency of the laser is 4Hz, the laser Raman conversion efficiency is reduced along with time, the output Raman laser beam has obvious jitter, and the stimulated Raman laser spot also has obvious deformation. When the laser repetition frequency increases again, the stimulated raman laser is severely degraded or even rendered inoperable within a few seconds.
When the airflow driving device 2 rotates, the repetition frequency of stable operation can be obviously improved, for example, when the wind speed is 2m/s, the laser Raman conversion efficiency is not reduced with time when the laser repetition frequency is 5Hz, the output Raman laser beam is not dithered or deformed, and when the laser repetition frequency is 10Hz, the laser Raman conversion efficiency is not reduced with time, and the output Raman laser beam is slightly dithered and deformed; when the wind speed is 5m/s, the laser Raman conversion efficiency is not reduced with time when the laser repetition frequency is 10Hz, the output Raman laser beam is free from jitter or deformation, and when the laser repetition frequency is 20Hz, the laser Raman conversion efficiency is not reduced with time, and the output Raman laser beam is slightly jittered and deformed.
Embodiment two: based on flow N 2 And the stimulated Raman scattering frequency conversion device of the gas.
As shown in FIG. 1, N with a pressure of 20atm 2 The gas is filled into a closed gas circulation main pipeline 1, and a gas driving device 2 is controlled to drive high pressure N 2 The gas flows clockwise, the gas flow enters the light-passing section 102 through the connecting section 104 on one side, and the gas flow enters the gas flow driving section 101 through the connecting section 104 on the other side after being output by the light-passing section 102, so that the circulating flow is formed. In this embodiment, the rotational speed of the air flow driving device 2 (fan) is controlled to control the air flow rate so as to adapt to different heat dissipation requirements, and the first flow guiding balance pipe 3 and the second flow guiding balance pipe 10 respectively communicate the air circulation main pipeline 1 with the first light guiding arm 4 and the second light guiding arm 8, so as to ensure that the compression of two sides of the first isolation optical window 6 is consistent and the compression of two sides of the second isolation optical window 7 is consistent.
In this embodiment, the first isolation optical window 6 and the second isolation optical window 7 are both fused silica plates with thickness of 2mm, and the included angle α between the first isolation optical window and the second isolation optical window is 58 degrees and symmetrically arranged to compensate for the deflection of light caused by the laser transmitted through the isolation windows, the laser input cavity mirror 5 is a fused silica planoconvex lens, the diameter is d=25mm, the focal length is 0.8m, both sides are plated with 532nm antireflection film and 607nm high reflection film, the laser output cavity mirror 9 is a fused silica plane mirror, both sides are plated with 532nm antireflection film and 607nm antireflection film, and the distance between the laser input cavity mirror 5 and the laser output cavity mirror 9 is 1.55m.
This embodiment employs Nd to output electro-optic Q: YAG pulse laser is used as pumping laser source, the output wavelength is 532nm, the pulse width is 10ns, the laser single pulse energy is 0.6J, the laser work repetition frequency is adjustable, the maximum is 30Hz, when in use, 532nm pulse laser is incident into the first light guide arm 4 through the laser input cavity mirror 5, and is sequentially transmitted into the second light guide arm 8 after passing through the first isolation optical window 6, the light transmission section 102 and the second isolation optical window 7, and then is output through the laser output cavity mirror 9, wherein 532nm laser is focused in the center of the light transmission section 102 after passing through the laser input cavity mirror 5 and is in high-voltage N with the focus area 2 The stimulated Raman scattering occurs, the 607nm stimulated Raman scattering light is generated, and the stimulated Raman laser light and the rest 532nm pump light are emitted through the laser output cavity mirror 9.
When the air flow driving device 2 does not rotate, the high pressure N in the air circulation main pipeline 1 2 When the repetition frequency of the laser is 2Hz, the embodiment can work normally and stably, the laser Raman conversion efficiency is not reduced along with time, and the output Raman laser beam is not dithered or deformed. When the repetition frequency of the laser is 3Hz, the embodiment can work normally and stably, the laser Raman conversion efficiency is not reduced with time, but the output Raman laser beam is slightly dithered and deformed. When the repetition frequency of the laser is 5Hz, the laser Raman conversion efficiency is reduced along with time, the output Raman laser beam has obvious jitter, and the stimulated Raman laser spot also has obvious deformation. When the laser repetition frequency increases again, the stimulated raman laser is severely degraded or even rendered inoperable within a few seconds.
When the airflow driving device 2 rotates, the repetition frequency of stable operation can be obviously improved, for example, when the wind speed is 2m/s, the laser Raman conversion efficiency is not reduced with time when the laser repetition frequency is 5Hz, the output Raman laser beam is not dithered or deformed, and when the laser repetition frequency is 10Hz, the laser Raman conversion efficiency is not reduced with time, and the output Raman laser beam is slightly dithered and deformed; when the wind speed is 5m/s, the laser Raman conversion efficiency is not reduced with time when the laser repetition frequency is 15Hz, the output Raman laser beam is free from jitter or deformation, and when the laser repetition frequency is 30Hz, the laser Raman conversion efficiency is not reduced with time, and the output Raman laser beam is slightly jittered and deformed.
Claims (7)
1. A flowing gas stimulated Raman scattering frequency conversion device is characterized in that: including gas circulation main line (1), air current drive arrangement (2), first light guide arm (4) and second light guide arm (8), gas circulation main line (1) is airtight pipeline and one side is air current drive section (101), opposite side is logical light section (102), air current drive section (101) are equipped with air current drive arrangement (2), logical light section (102) one end and first light guide arm (4) coaxial coupling, the other end and second light guide arm (8) coaxial coupling, first light guide arm (4) keep away from logical light section (102) one end is equipped with laser input chamber mirror (5), connects logical light section (102) one end is equipped with first isolation optical window (6), second light guide arm (8) are connected logical light section (102) one end is equipped with second isolation optical window (7), keep away from logical light section (102) one end is equipped with laser output cavity mirror (9), first isolation optical window (6) and second isolation optical window (7) symmetry set up and outside main slope all be equipped with first light guide arm (4) and first light guide arm (10) balanced pipe (4) of other end intercommunication.
2. The flowing gas stimulated raman scattering variable frequency device of claim 1, wherein: the gas circulation main pipeline (1) comprises a gas flow driving section (101), a light passing section (102), a bent pipe section (103) and a connecting section (104), wherein the end part of the gas flow driving section (101) and the end part of the light passing section (102) are respectively connected with the corresponding end part of the corresponding side connecting section (104) through the bent pipe section (103).
3. The flowing gas stimulated raman scattering variable frequency device of claim 2, wherein: the first flow guide balance pipe (3) is far away from one end of the first light guide arm (4) and is connected with a bent pipe section (103) adjacent to the same side, and the second flow guide balance pipe (10) is far away from one end of the second light guide arm (8) and is connected with a bent pipe section (103) adjacent to the same side.
4. The flowing gas stimulated raman scattering variable frequency device of claim 1, wherein: the included angle between the first isolation optical window (6) and the vertical direction and the included angle between the second isolation optical window (7) and the vertical direction are alpha, and the alpha is 50-65 degrees.
5. The flowing gas stimulated raman scattering variable frequency device of claim 1 or 4, wherein: the first isolation optical window (6) and the second isolation optical window (7) are thin optical elements with the thickness of less than 3 mm.
6. The flowing gas stimulated raman scattering variable frequency device of claim 1, wherein: the laser input cavity mirror (5) is a focusing lens, the two sides of the laser input cavity mirror are plated with a pumping laser antireflection film and a Raman laser high-reflection film, and the two sides of the laser output cavity mirror (9) are plated with a pumping laser antireflection film and a Raman laser antireflection film.
7. The flowing gas stimulated raman scattering variable frequency device of claim 6, wherein: the focal length of the laser input cavity mirror (5) is f, the distance between the laser input cavity mirror (5) and the laser output cavity mirror (9) is L, and f and L are more than or equal to 0.45L and less than or equal to 0.6L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010959346.XA CN114188801B (en) | 2020-09-14 | 2020-09-14 | Flowing gas stimulated Raman scattering frequency conversion device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010959346.XA CN114188801B (en) | 2020-09-14 | 2020-09-14 | Flowing gas stimulated Raman scattering frequency conversion device |
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| Publication Number | Publication Date |
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| CN114188801A CN114188801A (en) | 2022-03-15 |
| CN114188801B true CN114188801B (en) | 2023-11-17 |
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| CN202010959346.XA Active CN114188801B (en) | 2020-09-14 | 2020-09-14 | Flowing gas stimulated Raman scattering frequency conversion device |
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| CN109185750A (en) * | 2018-09-13 | 2019-01-11 | 湖南华特光电科技有限公司 | A kind of Projecting Lamp |
| CN110600987A (en) * | 2018-06-13 | 2019-12-20 | 中国科学院大连化学物理研究所 | Fan type gas circulation high repetition frequency Raman cell |
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| JPH06326379A (en) * | 1993-05-14 | 1994-11-25 | Matsushita Electric Ind Co Ltd | Gas laser oscillator |
| CN101222111A (en) * | 2007-12-11 | 2008-07-16 | 中国科学院长春光学精密机械与物理研究所 | Ring-shaped channel type laser cavity |
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