High-order Stokes light generation device

Abstract

The invention discloses a higher-order Stokes light generation device, comprising a confocal unsteady cavity A and a multi-thread pool B. The confocal unsteady cavity A has two high reflection concave cavity mirrors which are positioned symmetrically; a resonant cavity satisfies the condition of the confocal unsteady cavity; base frequency laser and a first stage Stokes light (marked as S1) passes through a scraper mirror A and a ridge mirror and is outputted to a multi-thread pool B; a gas Raman medium is filled in the B, the concave surface cavity mirrors are placed on two side, on which high reflection films reflecting base frequency light, S1 and second stage Stokes light (marked as S2) are plated, and the two concave surface cavity mirrors are sealed with the multi-thread pool through a flange; the laser and the Raman light which enter the multi-thread pool are constantly oscillated and amplified between two cavity mirrors in the multi-thread pool; and the amplified high order Stokes light is outputted from a multi-thread pool output window. The high-order Stokes light generation device can reduce the high order Stokes light generation threshold, improves the Raman conversion efficiency, can change the Raman laser wave length through changing the Raman pool and the Raman active gas in the multi-thread pool, can change the Raman laser length, and can realize the switchable output of the multi-wave-band laser.

Description

Technical field [0001] The present invention is a high-order Stokes light generating device, which adopts the technology of combining the confocal unstable cavity and the multi-pass cell, and is related to the Raman laser technology for realizing laser frequency conversion. The present invention adopts the multi-pass cell 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 the laser wavelength conversion and expand the laser output laser band. The stimulated Raman scattering using Raman medium can realize the change of the laser wavelength. According to the actual conditions, different orders can be obtained. The frequency of the laser is shifted to obtain Stokes light of different wavelengths. [0003] At present, there are two main methods to achieve Raman laser frequency shift: The first is to use the external cavity method, that is, to...

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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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