Infrared laser in self-optical parametric oscillation of double-cavity composite unsteady cavity mode selection pump

Abstract

An infrared laser in a self-optical parametric oscillation of double-cavity composite unsteady cavity mode selection pump relates to the laser field. A problem that the infrared laser in a self-optical parameter based on an Nd: MgO: PPLN crystal considers matching of high power and high beam quality base frequency light self-pump and a focusing parameter during a self-optical parameter oscillation process is solved. The laser comprises two laser diode pump sources, two energy transfer fibers, four focusing lenses, two 45 degree beam splitter mirrors, a parameter-oscillation-cavity totally-reflective mirror, a parameter oscillation cavity output mirror, the Nd: MgO: PPLN crystal, a temperature controller and an acousto-optic Q switch. Through adopting a double-cavity composite structure of a base-frequency optical resonant cavity and a parametric optical oscillation cavity, integration compactness is considered and simultaneously the two cavities completely work separately so that cavity-type structure parameter designs of the two cavities do not interfere with each other. Large base mode high beam quality base frequency optical pump can be realized, oscillation parameter light and base frequency light focusing parameters are highly matched, and energy conversion efficiency is high.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to a self-optical parametric oscillation mid-infrared laser with dual-cavity compound unstable cavity mode-selective pumping. Background technique [0002] The 3-5μm mid-infrared band laser covers the most important transmission window of the atmosphere. This band of laser has great application prospects in environmental protection, medical treatment, national defense and other fields, and is an important branch of laser technology research. Optical parametric oscillation (OPO) is one of the important nonlinear frequency conversion technologies to expand the laser output wavelength. It has become the most widely used technical means to obtain mid-infrared laser. However, since these crystals only have a single frequency conversion function, a gain crystal doped with rare earth ions is also required to provide fundamental frequency pump light. In contrast, doping rare earth ions int...

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Problems solved by technology

[0004] In order to solve the problem of how the self-optical parametric mid-infrared laser based on Nd:MgO:PPLN crystal can take into account the high-power, high-beam-quality self-pumping of fundamental frequency light and the matching of focusing parameters during the self-optical parametric oscillation process, the present invention provides a dual-cavity composite Self-optical parametric oscillation mid-infrared laser with cavity-stabilized mode-selective pumping

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