2-micron laser based on half-intracavity optical parametric oscillator containing volume grating

Abstract

A 2-micrometer laser device capable of forming a half-intracavity optical parametric oscillator on the basis of a volume grating sequentially comprises a first plane mirror, a laser crystal, an acousto-optic Q-switch, a second plane mirror, a nonlinear crystal, a third plane mirror and the volume grating; the first plane mirror, the laser crystal, the acousto-optic Q-switch and the third plane mirror form a 1-micrometer laser device; the second plane mirror, the nonlinear crystal and the volume grating form an optical parametric oscillator; a large beam radius side is arranged on a main nodal plane of the laser crystal; the first plane mirror is high in reflectivity to 1-micrometer laser; the second plane mirror is high in reflectivity to 2-micrometer laser and high in transmission to the 1-micrometer laser; the third plane mirror is high in reflectivity to the 1-micrometer laser and high in transmittance to the 2-micrometer laser; the nonlinear crystal is arranged at the position corresponding to the maximum confocal parameter of 1-micrometer laser beams; and the 2-micrometer laser can be partially transmitted through the volume grating and can be partially reflected by the volume grating. The 2-micrometer laser device has the advantages that the 2-micrometer laser with high beam quality and power and narrow line width can be outputted by the 2-micrometer laser device, and the 2-micrometer laser device is simple in structure and low in cost.

Description

[0001] The patent application for the present invention is a divisional application of the Chinese invention patent application with the application number 201310109999.9 and the application date of March 29, 2013. The title of the invention of the original application is "A 2μm Laser Based on a Volume Grating Forming a Semi-cavity Optical Parametric Oscillator". technical field [0002] The invention belongs to the technical field of lasers, in particular to a 2 μm laser which forms a semi-cavity optical parametric oscillator based on volume gratings. Background technique [0003] The 2μm laser source has important application value in the military, and it is an ideal light source for pumping an Optical Parametric Oscillator (OPO, Optical Parametric Oscillator) to generate mid-infrared laser (3-5μm laser). Furthermore, in the fields of medical treatment, remote sensing and material science, 2μm laser sources also have great potential. Therefore, the 2μm laser source has al...

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Problems solved by technology

However, the linewidth of the 2μm laser output by ordinary optical parametric oscillators based on periodically polarized crystals such as PPLN, PPKTP, and PPLT is very wide, generally exceeding 60nm, which exceeds the receiving line of less than 7nm of the phosphorus-germanium-zinc optical parametric oscillator. width

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