Multi-pass prism coupler utilizing total internal reflection angle

Abstract

A multi-pass prism coupler utilizing a total internal reflection angle comprises a first coupling prism, a non-linear frequency conversion crystal and a second coupling prism which are sequentially arranged in the light beam irradiation direction, the non-linear frequency conversion crystal is in a flat plate shape, and the first coupling prism and the second coupling prism are arranged in two opposite plate faces of the non-linear frequency conversion crystal respectively. The nonlinear frequency conversion crystal is used for propagating light beams entering the nonlinear frequency conversion crystal at a phase matching angle, realizing multi-pass total internal reflection between the first reflection region and the second reflection region along a light path, and outputting the light beams through the first coupling prism or the second coupling prism. According to the coupler provided by the embodiment of the invention, the incident light is reflected for multiple times in the nonlinear frequency conversion crystal by utilizing the total internal reflection angle, so that the effective length of the frequency doubling crystal is multiplied, and the conversion efficiency and theoutput power of the frequency doubling light are further improved.

Description

technical field [0001] The invention relates to the technical field of nonlinear optical frequency conversion laser, and more specifically relates to a multi-pass prism coupler utilizing total internal dihedral. Background technique [0002] The wavelength of deep ultraviolet laser (below 200nm) is short, so it has the characteristics of high photon energy, which makes deep ultraviolet laser show its talents in many fields such as materials, physics, chemistry, biology, and environmental protection. Therefore, in order to develop the laser field with shorter wavelengths, researchers are constantly looking for new deep ultraviolet nonlinear optical materials. KBBF (KBe 2 BO 3 f 2 , potassium fluoroboryryllium acid) and RBBF (rubidium fluoroboryryllium acid, RbBe 2 BO 3 f 2 ) are currently the only two nonlinear optical crystals that can directly double frequency to achieve deep ultraviolet laser output. In order to overcome the problem that KBBF crystals cannot perform...

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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