Dual-mode switchable output mid-infrared light parametric oscillator

Abstract

The invention discloses a dual-mode switchable output mid-infrared optical parametric oscillator, belongs to the technical field of a laser, and solves a problem of a single output mode of an existingmid-infrared band light parametric oscillator. The dual-mode switchable output mid-infrared light parametric oscillator comprises a pump light coupling system and a T-shaped inner cavity pumping typelight parametric oscillator. The pump light coupling system is composed of a pump source doped with Tm<3+>, a pump light half-wave plate, a polarizing beam splitter, a first focusing assembly, a second focusing assembly, a first pump light total reflection mirror and a second pump light total reflection mirror. The T-shaped inner cavity pumping type light parametric oscillator is composed of a first fundamental frequency light total reflection mirror, a second fundamental frequency light total reflection mirror, a first gain medium, a second gain medium, a first intra-cavity lens, a second intra-cavity lens, a second dichroic mirror, a first dichroic mirror, an acousto-optic Q switch, a fundamental frequency light half-wave plate, a parametric light total reflection mirror, a nonlinear crystal and an output mirror. The invention is used for the dual-mode switchable output mid-infrared light parametric oscillator.

Description

technical field

[0001] The invention belongs to the field of laser technology. Background technique

[0002] 3μm~14μm belongs to the mid-infrared band in the spectrum, covering multiple atmospheric transparent windows and being in the "fingerprint identification area" of many gas molecules. Environmental protection and other fields have important application value. At present, the device that can realize the full coverage of laser in this band is mainly the optical parametric oscillator (OPO). Laser output, because the generation of the laser does not depend on the energy level transition of the doped ions in the gain medium, the OPO technology can be used to develop a mid-infrared laser source with high flexibility and various working modes, which can meet the laser parameters of this band in different fields different needs.

[0003] The output characteristics of the optical parametric oscillator mainly depend on the nonlinear crystal and its pump source. At present, th...

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