A Long-Wave Infrared Optical Parametric Oscillator with High Conversion Efficiency

Abstract

The invention discloses a long-wave infrared optical parametric oscillator with the high conversion efficiency. The long-wave infrared optical parametric oscillator comprises a pumping laser device, afirst beam coupling system, a medium-wave infrared optical parametric oscillator with a first nonlinear crystal, a first beam splitter, a laser polarization adjustment system, a second beam couplingsystem, a long-wave infrared optical parametric oscillator provided with a second nonlinear crystal, and a second beam splitter. The pumping laser device generates a pump laser output; the first nonlinear crystal carries out frequency conversion and the medium-wave infrared optical parametric oscillator carries out optical resonant cavity oscillation to realize a medium-wave infrared laser output;and the medium-wave infrared laser is processed by frequency conversion by the second nonlinear crystal and optical resonant cavity oscillation by the long-wave infrared optical parametric oscillator, so that long-wave infrared laser outputting is realized. According to the invention, the medium-wave infrared laser is used as fundamental-frequency light of the long-wave infrared optical parametric oscillator and the medium-wave infrared laser is filtered by the beam splitting effect of the first beam splitter, so that the long-wave infrared laser outputting is realized.

Description

technical field [0001] The invention relates to the technical field of long-wave infrared optical parametric oscillators, in particular to a long-wave infrared optical parametric oscillator with high conversion efficiency. Background technique [0002] Long-wave infrared laser sources are widely used in air pollution detection, photoelectric countermeasures and other fields. At present, the most common and effective way to obtain long-wave infrared laser output is to use zinc-germanium-phosphorus crystals (ZnGeP 2 , referred to as ZGP) Optical Parametric Oscillator (optical parametric oscillator, referred to as OPO) for frequency conversion of laser light in the band near 2μm. In the process of long-wave infrared optical parametric oscillation, a pump photon is converted into a signal photon and an idler photon through nonlinear frequency. The signal light radiation wavelength is 2.5-2.8 μm, and the long-wave infrared laser is idler light, with a wavelength coverage of 7- ...

AI Technical Summary

Problems solved by technology

Since the shorter the wavelength, the higher the energy of a single photon, the signal light with a shorter wavelength occupies most of the pump energy in the process of optical parametric oscillation conversion. At present, the conversion efficiency of long-wave infrared optical parametric oscillators in the 7-10 μm band is generally only about 4%-10%, obviously, the light-to-light conversion efficiency of long-wave infrared lasers needs to be improved urgently

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