A high-order Stokes light generating device

Abstract

The invention is a high-order Stokes light generating device, which includes two parts: a confocal unstable cavity A and a multi-pass pool B; wherein the confocal unstable cavity A has two symmetrically placed high anti-concave mirrors, resonant The cavity satisfies the confocal unstable cavity condition; the fundamental frequency laser and the first-order Stokes light (denoted as S1) are output from A to the multi-pass cell B through the scraper mirror and the roof mirror; B is filled with a gaseous Raman medium, A concave cavity mirror coated with a high reflection film for the fundamental frequency light and S1 and secondary Stokes light (denoted as S2) is placed on both sides, and is sealed with the multi-pass cell through the flange; the laser and the multi-pass cell entering the multi-pass cell The Raman light continuously oscillates and amplifies between the two cavity mirrors in the multi-pass cell, and the amplified high-order Stokes light is output from the output window of the multi-pass cell. The invention can reduce the generation threshold of high-order Stokes light, and improve the Raman conversion efficiency; by changing the Raman active gas in the Raman pool and the multi-pass pool, the wavelength of the Raman laser can be changed, and the multi-band laser can be switched output.

Description

technical field [0001] The invention is a high-order Stokes light generation device, which adopts the technology of combining the confocal unstable cavity and the multi-pass pool, and is related to the Raman laser technology for realizing laser frequency conversion. The invention adopts the multi-pass pool cavity Internal amplification technology can selectively obtain high-order Stokes light. Background technique [0002] Raman laser scattering technology is an important technical means to realize laser wavelength conversion and expand the output laser band of lasers. Stimulated Raman scattering of Raman media can be used to change the laser wavelength. According to changes in actual conditions, different orders can be obtained. The laser frequency is shifted to obtain Stokes light of different wavelengths. [0003] At present, there are two main methods to realize the Raman laser frequency shift: the first one is to use the external cavity method, that is, the Raman mediu...

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Problems solved by technology

[0003] At present, there are two main methods to realize the Raman laser frequency shift: the first one is to use the external cavity method, that is, the Raman medium is placed outside the laser cavity, and the fundamental frequency laser output by the laser passes through the focusing lens, and when it passes through the Raman medium in a single pass Stimulated Raman scattering is generated to generate Stokes light or anti-Stokes light. In this process, only the power density of the fundamental frequency laser in a small area near the focal point of the focusing lens can reach the stimulated Raman conversion threshold, so the effective area between the laser and the Raman medium is short, the Raman conversion efficiency is not high, and the power requirements for the fundamental frequency laser are also high (generally tens of millijoules are required, and the pulse width is less than ten nanoseconds), And it is generally difficult to obtain high-order Stokes light output;

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