A Multi-pass Prism Coupler Utilizing Total Internal Dihedral

Abstract

A multi-pass prism coupler utilizing total dihedral angle, comprising a first coupling prism, a nonlinear frequency conversion crystal and a second coupling prism arranged in sequence along the light beam irradiation direction, the nonlinear frequency conversion crystal is flat, and the first coupling prism The prism and the second coupling prism are respectively arranged on two opposite board surfaces of the nonlinear frequency conversion crystal; After the multi-path total internal reflection is realized along the optical path between the two reflection areas, it is output through the first coupling prism or the second coupling prism. The coupler provided by the embodiment of the present invention utilizes the total internal dihedral angle to cause multiple reflections of the incident light in the nonlinear frequency conversion crystal, doubles the effective length of the frequency doubling crystal, and further improves the conversion efficiency and output power of the frequency doubling light.

Description

Technical field [0001] The present invention relates to a nonlinear optical frequency conversion of laser technology, and more particularly relates to a total internal angle of the multi-pass prism coupler. Background technique [0002] Deep ultraviolet laser light (200 nm or less) of the wave length, and thus has a large photon energy characteristics, which is so deep ultraviolet laser mettle materials in many fields, physical, chemical, biological, owned ring. Therefore, to develop more short wave laser field, researchers continue to seek the outer novel deep ultraviolet nonlinear optical material. KBBF (KBe 2 BO 3 Fly 2 , Beryllium, boron, fluorine, potassium) and RBBF (fluoroboric acid, rubidium, beryllium, RbBe 2 BO 3 Fly 2 ) Nonlinear optical crystal is currently the only two that multiply directly DUV laser output. To overcome KBBF crystal properties due to the layered structure, can not be cut to perform phase matching direction harmonics problems, there have been many te...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a coupler. Compared with the prior art, the coupler provided by the embodiment of the present invention can make the beam incident on the crystal The beam inside realizes total reflection, and by setting the reflection area corresponding to the internal reflection point of the nonlinear frequency conversion crystal in contact with the air, the beam can realize multi-pass total reflection in the crystal, which solves the problem of low frequency doubling efficiency of the laser and improves the Frequency Doubling Efficiency of Short Wave UV or Deep UV Laser

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