Self Raman yellow light laser of composite cavity structure

Abstract

The invention discloses a self Raman yellow light laser of a composite cavity structure. A laser diode pumping source emits pump light in an absorption belt of a gain medium, the pump light is focused inside the gain medium through a transmitting energy fiber and a coupling lens set, the gain medium absorbs the pump light to form population inversion, and base frequency laser generation is formed under the feedback action of a laser resonant cavity composed of a resonant cavity shared reflector and a laser total reflector; when base frequency laser passes through the gain medium, Raman gains are generated, and after the Raman gains are greater than the cavity loss of a Raman resonant cavity composed of the resonant cavity shared reflector, a beam splitter and a yellow light output mirror, stable Stokes light generation is formed in the Raman resonant cavity; the frequency of Stokes light is doubled in a frequency doubling crystal, and the generated yellow light secondary harmonic wave is output by the yellow light output mirror. The composite cavity structure is adopted, the length of a base frequency laser resonant cavity is largely decreased, and therefore the stable area of the resonant cavity is effectively enlarged, and the effect of improving the output power of the self Raman yellow light laser is achieved by applying higher pumping power.

Description

technical field [0001] The invention relates to the field of lasers, in particular to a self-Raman yellow laser with a composite cavity structure. Background technique [0002] Stimulated Raman scattering (SRS) is one of the important nonlinear optical frequency conversion technologies to expand the wavelength range of laser coherent radiation, especially the frequency doubling of the laser with a wavelength near 1064nm, which is the most easily obtained, after Raman frequency shifting, which can efficiently Generate a wide range of 580-590nm yellow band laser output. High-performance laser gain medium substrates such as yttrium vanadate and gadolinium vanadate have high Raman gain coefficients, so it is possible to realize a self-Raman laser in which a single crystal acts as both a laser gain medium and a Raman gain medium. As a special form of Raman laser, Raman laser has the advantages of compact structure and cost economy because it does not need a separate Raman gain m...

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Problems solved by technology

[0004] The invention provides a self-Raman yellow light laser with a compound cavity structure. The invention solves the limitation of the pump power of the existing self-Raman yellow light laser by the thermal effect and the s

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