Asymmetric flowing gas stimulated Raman scattering frequency conversion device

Abstract

The invention relates to the technical field of Raman laser, in particular to an asymmetric flowing gas stimulated Raman scattering frequency conversion device, which is characterized in that a gas circulation main pipeline is a closed pipeline, one side of the gas circulation main pipeline is a gas flow driving section, the other side of the gas circulation main pipeline is a light transmission section, and the gas flow driving section is provided with a gas flow driving device; one end of the light-passing section is coaxially connected with the input light guide arm, the other end of the light-passing section is coaxially connected with the output light guide arm, a laser input cavity mirror is arranged at the end, located outside the light-passing section, of the input light guide arm, and an input isolation optical window is arranged at the end, located inside the light-passing section, of the input light guide arm. An output isolation optical window inclining outwards is arranged at the end, connected with the light passing section, of the output light guide arm, a laser output cavity mirror is arranged at the end, away from the light passing section, of the output light guide arm, and a flow guide balance pipe is arranged at one end of the gas circulation main pipeline and communicated with the output light guide arm. The Raman medium circularly flows, the light passing section is kept in a good laminar flow state, heat dissipation is guaranteed, the conditions of deflection distortion and the like of a laser light path are reduced, and the 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 an asymmetric 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...

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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

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