Multi-pass prism coupler having air interlayer

Abstract

The invention discloses a multi-pass prism coupler with an air interlayer. The multi-pass prism coupler comprises a grooving coupling prism, a nonlinear frequency conversion crystal and a heat dissipation metal sheet which are sequentially arranged in the light beam irradiation direction. The non-linear frequency conversion crystal is in a flat plate shape, and the grooving coupling prism and theheat dissipation metal sheet are arranged on the two opposite plate faces of the non-linear frequency conversion crystal respectively. Fundamental frequency light is coupled into the grooved couplingprism and propagates in the crystal at a phase matching angle, and the fundamental frequency light and harmonic waves generated by entering the crystal are coupled and output from the prism after being reflected back and forth on two opposite plate surfaces of the crystal for multiple times. 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, the effective length of the nonlinear frequency conversion crystal is multiplied, and theheat dissipation metal sheet is arranged on the plate surface of the nonlinear frequency conversion crystal, so that the heat accumulation effect of the bonding surface of the prism and the crystal can be effectively reduced; therefore, the overall damage threshold of the coupler is greatly improved, and the conversion efficiency and the output power of the frequency-doubled light are further improved.

Description

technical field [0001] The invention relates to the technical field of nonlinear optical frequency conversion lasers, in particular to a multi-pass prism coupler with an air interlayer. Background technique [0002] The wavelength of deep ultraviolet laser is short, so it has the characteristics of high photon energy, which enables deep ultraviolet laser to show its talents in many fields such as materials, physics, chemistry, biology, and resource environment. KBBF (KBe 2 BO 3 F 2 , potassium fluoroborate) and RBBF (rubidium fluoroborate, RbBe 2 BO 3 F 2 ) are currently the only two nonlinear optical crystals that can directly frequency double the output of deep ultraviolet lasers (below 200 nm). Our country is in the leading position in this field, and invented KBBF crystal and prism coupling technology, which solved the problem that KBBF crystal cannot be cut in the phase matching direction due to the layered structure characteristics, and obtained the patent author...

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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 into the nonlinear frequency conversion crystal propagate at a phase matching angle, so that the beam incident into the The light beam in the crystal realizes total reflection, and by digging grooves on the coupling prism, the light beam can achieve total reflection in the crystal multiple times, which can solve the problem of low frequency doubling efficiency of lasers in the prior art, and improve the efficiency of short-wave ultraviolet or deep ultraviolet light. Laser Frequency Doubling Efficiency

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