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Closed-loop type flowing gas stimulated Raman scattering frequency conversion device

A technology of stimulated Raman scattering and flowing gas, applied in the direction of laser scattering effect, laser, electrical components, etc., can solve the problems of uneven gas density, beam drift, thermal distortion, etc., to improve the frequency conversion effect and stability, The effect of reducing uneven airflow and easy installation and replacement

Pending Publication Date: 2022-03-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the heat generated during the stimulated Raman frequency conversion process is large or the laser repetition rate used is high, the heat generated at the laser focus position may not be able to diffuse out in time, resulting in a decrease in Raman frequency conversion efficiency, beam drift or Undesirable consequences such as thermal distortion, the reasons include the uneven gas density in the Raman cell caused by thermal effects (such as thermal lens effect), or the disordered flow of gas molecules caused by temperature differences to generate local eddies, etc.
As a result, the stimulated Raman scattering frequency conversion device can only work at a lower repetition rate, or cannot be applied to Raman frequency conversion of higher power lasers

Method used

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  • Closed-loop type flowing gas stimulated Raman scattering frequency conversion device
  • Closed-loop type flowing gas stimulated Raman scattering frequency conversion device
  • Closed-loop type flowing gas stimulated Raman scattering frequency conversion device

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1, based on flowing CO 2 Gas stimulated Raman scattering frequency conversion device.

[0029] Such as figure 1 As shown, with CO at a pressure of 10atm 2 The gas is filled into the closed main gas circulation pipeline 1, and the airflow drive device 2 is controlled to drive the high-pressure CO 2 The gas flows clockwise, and the air flow enters the light-transmitting section 102 through the connecting section 104 on one side, is output from the light-passing section 102, and then enters the air-flow driving section 101 from the connecting section 104 on the other side, forming a circular flow. In this embodiment, the gas flow rate is controlled by controlling the speed of the airflow driving device 2 (axial flow fan), so as to adapt to different heat dissipation requirements.

[0030] In this embodiment, the angle α between the first optical window 3 and the second optical window 4 and the vertical direction is 57 degrees, and the symmetrical arrangement ...

Embodiment 2

[0034] Embodiment 2, based on flow N 2 Gas stimulated Raman scattering frequency conversion device.

[0035] Such as figure 1 As shown, put the pressure at 20atm of N 2 The gas is filled into the closed main gas circulation pipeline 1, and the air flow driving device 2 is controlled to drive the high pressure N 2 The gas flows clockwise, and the air flow enters the light-transmitting section 102 through the connecting section 104 on one side, is output from the light-passing section 102, and then enters the air-flow driving section 101 from the connecting section 104 on the other side, forming a circular flow. In this embodiment, the gas flow rate is controlled by controlling the speed of the airflow driving device 2 (axial flow fan), so as to adapt to different cooling requirements.

[0036] In this embodiment, the angle α between the first optical window 3 and the second optical window 4 and the vertical direction is 58 degrees, and the symmetrical arrangement of the firs...

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Abstract

The invention relates to the technical field of Raman laser, in particular to a closed-loop type flowing gas stimulated Raman scattering frequency conversion device which comprises a gas circulation main pipeline, a gas flow driving device, a first optical window and a second optical window, the gas circulation main pipeline is a closed-loop type sealing pipeline, one side of the gas circulation main pipeline is a gas flow driving section, and the other side of the gas circulation main pipeline is a light transmission section; the airflow driving section is provided with an airflow driving device, one end of the gas circulation main pipeline is provided with a first optical window, the other end of the gas circulation main pipeline is provided with a second optical window, and the first optical window, the light passing section and the second optical window are arranged in a line. And the first optical window and the second optical window are symmetrically arranged and are respectively fixed on the gas circulation main pipeline through fixing assemblies. The Raman medium circularly flows, the light passing section in the flowing pipeline is kept in a good laminar flow state, heat dissipation is guaranteed, the conditions of laser light path deflection distortion and the like caused by uneven airflow or eddy current are reduced, and the Raman frequency conversion device can be used for Raman frequency conversion of high-power or high-repetition-frequency laser.

Description

technical field [0001] The invention relates to the technical field of Raman lasers, in particular to a closed-loop flowing gas stimulated Raman scattering frequency conversion device. Background technique [0002] Stimulated Raman scattering technology is a common laser frequency conversion method. Its advantages are simple device design, convenient debugging, and various stimulated Raman media that can be selected. Different Raman media have different spectral shift ranges for pump lasers. For example, a solid can produce a movement of tens of hundreds of wavenumbers, while a gas Raman medium can produce a frequency shift of thousands of wavenumbers. Therefore, the transformation span using Raman frequency conversion is relatively large, and the variable wavelengths are abundant. Currently commonly used Raman media are crystals (such as: diamond, SrWO 4 ), liquid (such as: H 2 O, CS 2 , C 6 h 6 ) and gases (such as: H 2 , CH 4 ), in which the stimulated Raman freque...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/034H01S3/036H01S3/10H01S3/102H01S3/104H01S3/30
CPCH01S3/305H01S3/104H01S3/1026H01S3/10H01S3/036H01S3/034
Inventor 蔡向龙刘金波郭敬为李仲慧
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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