Fundamental frequency light seed injected narrow linewidth inner cavity Raman laser

Abstract

The invention discloses a fundamental frequency light seed injected narrow linewidth inner cavity Raman laser. A laser gain medium absorbs pumping light to form population inversion so as to generate laser gain, and thus 1064nm fundamental frequency laser oscillation formed under positive feedback effect of a laser resonant cavity composed of a resonant cavity reflecting mirror, a resonant cavity folded mirror and an output mirror; a fundamental frequency light seed source emits 1064nm single frequency seed light which enters the laser resonant cavity after passing through the isolator and being focused by a seed light coupling lens and reflected by a beam splitter; the single frequency seed light is effectively coupled into the laser resonant cavity to achieve seed injection; when 1064 fundamental frequency laser passes through a laser gain medium and a Raman gain medium, Raman gain is generated, when the Raman gain is larger than loss of the Stokes resonant cavity composed of the resonant cavity reflecting mirror, the resonant cavity folded mirror and the output mirror, stimulated Raman scattering occurs, and stable 1176nm Stokes light oscillation is formed in the Stokes resonant cavity.

Description

technical field [0001] The invention relates to the field of lasers, in particular to a narrow-linewidth intracavity Raman laser injected with fundamental-frequency light seeds. Background technique [0002] Stimulated Raman scattering (SRS) is one of the important nonlinear optical frequency conversion technologies. Raman lasers based on SRS have the characteristics of automatic phase matching and beam cleanup, and it is easy to obtain high beam quality The stable output is used in ultraviolet, visible light, near-infrared to mid-infrared light sources. In particular, intracavity Raman lasers, including self-Raman lasers, have the advantages of simple and compact structure and low cost. They are research hotspots in the field of laser technology in recent years and are widely used. [0003] The intracavity Raman laser in the prior art has the problem of broadening the fundamental frequency light spectrum and affecting the conversion efficiency of SRS under the high power o...

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Problems solved by technology

[0008] The invention provides a narrow-linewidth intracavity Raman laser injected with fundamental-frequency optical seeds. The invention solves the problem of the effective Raman gain coefficient g caused by widening of the fundamental-frequency light width under the high power of the existing intracavity Raman laser. eff Decrease, the problem that affects the conversion efficiency of Raman lasers, see the following description for details:

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