CN116149107A - Partition laminar flow gas stimulated Raman scattering frequency conversion device - Google Patents

Partition laminar flow gas stimulated Raman scattering frequency conversion device Download PDF

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Publication number
CN116149107A
CN116149107A CN202111401743.6A CN202111401743A CN116149107A CN 116149107 A CN116149107 A CN 116149107A CN 202111401743 A CN202111401743 A CN 202111401743A CN 116149107 A CN116149107 A CN 116149107A
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optical window
gas
flow
laser
raman
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刘金波
郭敬为
蔡向龙
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Dalian Institute of Chemical Physics of CAS
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Dalian Institute of Chemical Physics of CAS
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/3501—Constructional details or arrangements of non-linear optical devices, e.g. shape of non-linear crystals
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Lasers (AREA)

Abstract

The invention belongs to the technical field of Raman lasers, and relates to a zoned laminar flow gas stimulated Raman scattering frequency conversion device. The device comprises a closed gas circulation pipeline shell, a gas flow layering baffle, a first optical window and a second optical window; the upper end of the closed gas circulation pipeline shell is provided with an air flow input port, and the lower end of the closed gas circulation pipeline shell is provided with an air flow output port; the left side and the right side of the closed gas circulation pipeline shell are respectively provided with a first optical window and a second optical window in parallel, and a group of airflow layering baffles are arranged in the closed gas circulation pipeline shell; the air flow layering baffle plate divides the inside of the closed air circulation pipeline shell into a plurality of groups of parallel and relatively independent small pipelines. The device of the invention ensures that the light-transmitting section in the Raman medium circulation flow pipeline maintains a better laminar flow state, reduces the deflection distortion and the like of the optical paths of the pumping laser and the Raman laser caused by uneven airflow or turbulence while ensuring effective heat dissipation, and ensures that the stimulated Raman frequency conversion device can be used for Raman frequency conversion of high-power or higher-repetition-frequency laser.

Description

Partition laminar flow gas stimulated Raman scattering frequency conversion device
Technical Field
The invention belongs to the technical field of Raman lasers, and particularly relates to a zoned laminar flow gas stimulated Raman scattering frequency conversion device, which is a device for stably generating Raman lasers at high repetition frequency by utilizing a laminar flow gas Raman medium in a sealed Raman 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 tens 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 ) Gas (e.g.: h 2 ，CH 4 ) The method comprises the steps of carrying out a first treatment on the surface of the The stimulated Raman produced by the gas Raman medium has large 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 relatively high or the repetition frequency of the laser used is relatively high, 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 effects 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 turbulence generated by the disordered flow of gas molecules caused by the temperature difference, and the like. 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.
To solve this problem, the prior art adopts a method of flowing and radiating raman medium, but considering the influence of flowing medium on the light beam propagation, the flow field is required to be laminar so as to reduce or even eliminate the degradation (such as optical distortion, jitter, etc.) of the quality of the light beam by the fluid. The gas stimulated Raman frequency conversion device generally adopts a Raman tube, a laser light path generally propagates along the axial direction of the Raman tube, and when airflow also flows along the axial direction, a longer laser and flow field acting area exists, so that light beam distortion caused by uneven flow field is easy to occur; in contrast, the cross flow mode, namely the mode that the laser beam and the air flow direction are crossed, can effectively reduce the influence of the effect due to the short action area of the laser beam and the flow field; however, the cross flow mode generally has larger volume scale of the optical cavity, and in addition, if the laminar flow condition is to be met, the flow speed of the air flow needs to be obviously reduced, so that the heat exchange capability is reduced.
Disclosure of Invention
In order to solve the technical problems, the invention provides the stimulated Raman scattering frequency conversion device based on the zoned cross-flow gas circulation Raman pool, which is characterized in that by arranging the airflow layering baffle and the optical window, the laser passing part in the Raman medium circulation flow pipeline is kept in a better laminar state, no or only a very small amount of turbulence is generated, the pump laser and the Raman laser are enabled to pass through the gas laminar region while effective heat dissipation is ensured, and the optical path deflection distortion and the like caused by uneven airflow or turbulence are reduced, so that the stimulated Raman frequency conversion device can be used for Raman frequency conversion of high-power laser with higher repetition frequency. The invention improves the frequency conversion effect and stability of the Raman frequency conversion device in the high-power laser field, and expands the application range of the stimulated Raman scattering frequency conversion technology.
In order to achieve the above object, the technical scheme of the present invention is as follows:
the invention provides a zoned cross-flow gas stimulated Raman scattering frequency conversion device, which comprises a closed gas circulation pipeline shell, a gas flow layering baffle, a first optical window and a second optical window; the upper end of the closed gas circulation pipeline shell is provided with an air flow input port, and the lower end of the closed gas circulation pipeline shell is provided with an air flow output port; the left side and the right side of the closed gas circulation pipeline shell are respectively provided with a first optical window and a second optical window in parallel, and a group of airflow layering baffles are arranged in the closed gas circulation pipeline shell; the air flow layering baffle plate divides the inside of the closed air circulation pipeline shell into a plurality of groups of parallel and relatively independent small pipelines; the part of the airflow layering baffle, which is parallel to the first optical window and the second optical window, is a transparent optical window.
The first optical window and the second optical window are plane optical windows, and are plated with pumping laser and Raman laser antireflection films.
The thickness of the airflow layering baffle is less than 3mm, the pipeline is divided into a plurality of small pipelines, and the inner walls of the small pipelines in each group are smooth and have no burrs or bulges so as to keep the internal gas flow field uniform.
The invention also provides a using method of the stimulated Raman scattering frequency conversion device, which comprises the following steps:
(1) Filling gas into the stimulated Raman scattering frequency conversion device, controlling the gas to flow from top to bottom, enabling the gas flow to enter each small pipeline after passing through the gas flow layering baffle plate, enabling the gas flow in the small pipeline to be laminar, and outputting the gas flow from each small pipeline;
(2) The included angles between the central line of the pumping laser beam and the normals of the first optical window and the second optical window are alpha, and alpha is the Brewster angle; the Raman laser generated by the pump laser in the high-pressure Raman medium is transmitted coaxially with the pump laser.
The velocity v of the gas flow in the small pipe is related to the small pipe width d and the reynolds number re=pvd/μ <3000, more preferably the reynolds number re=pvd/μ <2500 of the gas flow in the small pipe, where ρ is the gas density and μ is the gas viscosity.
The pump laser is p polarized light.
In the step (1), the air flow is driven to flow in the pipeline by an axial flow fan and an air pump.
The beneficial effects of the invention are as follows:
the invention divides the closed gas circulation pipeline into a plurality of groups of small gas circulation pipelines by using the layered baffle plate with the optical windows, so that the light transmission section in the Raman medium circulation flow pipeline keeps a better laminar flow state, the linearly polarized pump laser beam passes through each optical window at the Brewster angle, the interface loss is reduced, the effective heat dissipation is ensured, and meanwhile, the light path deflection distortion of the pump laser and the Raman laser caused by uneven airflow or turbulence is reduced, so that the stimulated Raman frequency conversion device can be used for Raman frequency conversion of high-power or higher-repetition-frequency laser;
the invention reduces the influence of the thermal effect on the stimulated Raman frequency conversion efficiency, simultaneously gives consideration to the uniformity of the flow field, reduces the degradation of the light beam quality caused by the uneven flow field, and is beneficial to improving the stimulated Raman conversion efficiency and the light beam quality;
the invention improves the frequency conversion effect and stability of the Raman frequency conversion device in the high-power laser field, and expands the application range of the stimulated Raman scattering frequency conversion technology.
Drawings
FIG. 1 is a schematic structural diagram of a flowing gas stimulated Raman scattering frequency conversion device;
wherein: 1. the device comprises a closed gas circulation pipeline shell, 2 airflow layering baffles, 3-1, a first optical window, 3-2 and a second optical window.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to fig. 1 and the embodiment. The invention designs the flowing gas stimulated Raman scattering frequency conversion device for dissipating heat by using circulating air flow, which aims at solving the problem of light distortion or conversion efficiency reduction in the high-repetition frequency stimulated Raman scattering process, and ensures effective heat dissipation and reduces the deflection distortion of the optical paths of pumping laser and Raman laser caused by uneven air flow or turbulence by properly designing the light-passing section in the pipeline. A few examples are briefly described as follows:
a zoned cross-flow gas stimulated Raman scattering frequency conversion device is shown in figure 1, and comprises a closed gas circulation pipeline shell 1, a gas flow layering baffle 2, a first optical window 3-1 and a second optical window 3-2; the upper end of the closed gas circulation pipeline shell 1 is provided with an air flow input port, and the lower end is provided with an air flow output port; the left side and the right side of the closed gas circulation pipeline shell 1 are respectively provided with a first optical window 3-1 and a second optical window 3-2 in parallel, and a group of airflow layering baffles 2 are arranged in the closed gas circulation pipeline shell 1; the air flow layering baffle plate 2 divides the inside of the closed air circulation pipeline shell 1 into a plurality of groups of parallel and relatively independent small pipelines; the part of the airflow layering baffle 2 parallel to the first optical window 3-1 and the second optical window 3-2 is a transparent optical window.
The first optical window 3-1 and the second optical window 3-2 are plane optical windows, and are plated with pumping laser and Raman laser antireflection films.
The thickness of the airflow layering baffle plate 2 is less than 3mm, the pipeline is divided into a plurality of small pipelines, and the inner walls of the small pipelines of each group are smooth and have no burrs or bulges so as to keep the internal gas flow field uniform.
Example 1 flow CO based 2 Stimulated raman scattering frequency conversion device of gas:
the specific method comprises the following steps: CO at a pressure of 10atm 2 The gas is filled into the zoned cross flow gas stimulated Raman scattering frequency conversion device, and the fan is controlled to drive high-pressure CO 2 The air flows from top to bottom, the air flows respectively enter each small pipeline after entering the air flow layering baffle area, then are output from each small pipeline, and return to the air flow driving section again through the high-pressure hose, and the air flow speed is controlled by controlling the rotating speed of the fan so as to adapt to different heat dissipation requirements;
adopting Nd with Q modulation by output electro-optic: YAG pulse laser is used as pumping laser source, the output wavelength is 1064nm, the pulse width is 10ns, the laser single pulse energy is 1J, the laser work repetition frequency is adjustable, and the maximum is 20Hz. The 1064nm pulse laser is input into the stimulated Raman scattering frequency conversion device through the first optical window 3-1, sequentially passes through the first optical window 3-1, the optical window of the airflow layering baffle 2 and the second optical window 3-2 and then is output, and the included angles between the central line of the pumping laser beam and the normals of the first optical window 3-1 and the second optical window 3-2 are alpha, wherein alpha is 57 degrees.
When the fan does not work, high-pressure CO in the stimulated Raman scattering frequency conversion device 2 When the repetition frequency of the laser is 1Hz, the stimulated Raman scattering device can work normally and stably, the laser Raman conversion efficiency is not reduced with time, and the output Raman laser beam is free from jitter or deformation. When the repetition frequency of the laser is 2Hz, the stimulated Raman scattering device can work normally and stably, the laser Raman conversion efficiency is not reduced with time, but the output Raman laser beam slightly shakes and deforms; when the repetition frequency of the laser is 4HIn z, 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 repetition frequency of the laser increases again, the stimulated raman laser is severely degraded or even rendered inoperable within a few seconds.
When the fan starts to work, because the air flow in each small pipeline is always in a flowing state, heat generated by the stimulated Raman effect can be taken away in time, so that the repetition frequency of the stimulated Raman scattering device can be obviously improved, when the repetition frequency of a laser is 5Hz, the laser Raman conversion efficiency is not reduced with time, the output Raman laser beam is not dithered or deformed, and when the repetition frequency of the laser is 10Hz, the laser Raman conversion efficiency is not reduced with time, and weak dithering and deformation of the output Raman laser beam occur; when the wind speed is 12m/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.
Example 2 flow N-based 2 Stimulated raman scattering frequency conversion device of gas:
the specific method comprises the following steps: n with pressure of 30atm 2 The gas is filled into the zoned cross flow gas stimulated Raman scattering frequency conversion device, and the fan is controlled to drive high-voltage N 2 The air flows from top to bottom, the air flows respectively enter each small pipeline after entering the baffle area, then are output from each small pipeline and return to the air flow driving section again through the high-pressure hose, and the air flow speed is controlled by controlling the rotating speed of the fan so as to adapt to different heat dissipation requirements;
adopting Nd with Q modulation by output electro-optic: YAG pulse laser is used as pumping laser source, the output wavelength is 1064nm, the pulse width is 10ns, the laser single pulse energy is 1J, the laser work repetition frequency is adjustable, and the maximum is 20Hz. The 1064nm pulse laser is input into the stimulated Raman scattering frequency conversion device through the first optical window 3-1, sequentially passes through the first optical window 3-1, the airflow layering baffle 2 and the second optical window 3-2 and then is output, the included angles between the central line of the pumping laser beam and the normals of the first optical window 3-1 and the second optical window 3-2 are alpha, alpha is 56 degrees, and the adopted optical windows are JGS1 quartz.
When the fan does not work, high-voltage N in stimulated Raman scattering frequency conversion device 2 When the repetition frequency of the laser is 1Hz, the stimulated Raman scattering device can work normally and stably, the laser Raman conversion efficiency is not reduced with time, and the output Raman laser beam is free from jitter or deformation. When the repetition frequency of the laser is 2Hz, the stimulated Raman scattering device can work normally and stably, the laser Raman conversion efficiency is not reduced with time, but the output Raman laser beam slightly shakes and deforms; 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 repetition frequency of the laser increases again, the stimulated raman laser is severely degraded or even rendered inoperable within a few seconds.
When the fan starts to work, because the air flow in each small pipeline is always in a flowing state, heat generated by the stimulated Raman effect can be taken away in time, so that the repetition frequency of the stimulated Raman scattering device can be obviously improved, when the repetition frequency of a laser is 5Hz, the laser Raman conversion efficiency is not reduced with time, the output Raman laser beam is not dithered or deformed, and when the repetition frequency of the laser is 10Hz, the laser Raman conversion efficiency is not reduced with time, and weak dithering and deformation of the output Raman laser beam occur; when the wind speed is 12m/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 30Hz, the laser Raman conversion efficiency is not reduced with time, and the output Raman laser beam is slightly jittered and deformed.

Claims (8)

1. The zoned cross-flow gas stimulated Raman scattering frequency conversion device is characterized by comprising a closed gas circulation pipeline shell (1), an air flow layering baffle (2), a first optical window (3-1) and a second optical window (3-2); the upper end of the closed gas circulation pipeline shell (1) is provided with an air flow input port, and the lower end of the closed gas circulation pipeline shell is provided with an air flow output port; the left side and the right side of the closed gas circulation pipeline shell (1) are respectively provided with a first optical window (3-1) and a second optical window (3-2) in parallel, and a group of airflow layering baffles (2) are arranged in the closed gas circulation pipeline shell (1); the air flow layering baffle (2) divides the inside of the closed air circulation pipeline shell (1) into a plurality of groups of parallel and relatively independent small pipelines; the part of the airflow layering baffle plate (2) parallel to the first optical window (3-1) and the second optical window (3-2) is a transparent optical window.
2. The stimulated raman scattering frequency conversion device according to claim 1, wherein the first optical window (3-1) and the second optical window (3-2) are planar optical windows, and are coated with pumping laser and a raman laser antireflection film.
3. The stimulated raman scattering frequency conversion device according to claim 1, characterized in that the thickness of the gas flow stratification baffle (2) is <3mm.
4. A method of using the stimulated raman scattering frequency conversion apparatus of any one of claims 1 to 3, comprising the steps of:
(1) Filling gas into the stimulated Raman scattering frequency conversion device, controlling the gas to flow from top to bottom, enabling the gas flow to enter each small pipeline after passing through the gas flow layering baffle (2) so that the gas flow in the small pipeline is laminar, and outputting the gas flow from each small pipeline;
(2) The included angles between the central line of the pumping laser beam and the normals of the first optical window and the second optical window are alpha, and alpha is the Brewster angle; the Raman laser generated by the pump laser in the high-pressure Raman medium is transmitted coaxially with the pump laser.
5. The method of claim 4, wherein the velocity v of the gas flow in the small pipe is related to the small pipe width d, and the reynolds number Re = pvd/μ <3000, where ρ is the gas density and μ is the gas viscosity.
6. The method of claim 5, wherein the reynolds number Re = pvd/μ <2500 for the gas flow in the small pipe, where ρ is the gas density and μ is the gas viscosity.
7. Use according to claim 4, characterized in that the pump laser is p-polarized light.
8. The method of claim 4, wherein the air flow in step (1) is driven to flow in the pipeline by an axial flow fan or an air pump.
CN202111401743.6A 2021-11-19 2021-11-19 Partition laminar flow gas stimulated Raman scattering frequency conversion device Pending CN116149107A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118190829A (en) * 2024-05-17 2024-06-14 西安科技大学 Photothermal spectrum trace gas detection device and method based on tuning fork resonance

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118190829A (en) * 2024-05-17 2024-06-14 西安科技大学 Photothermal spectrum trace gas detection device and method based on tuning fork resonance

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