Self-injection structure for realizing isotropic medium output linearly polarized single-frequency laser

Abstract

The invention provides a self-injection structure for realizing isotropic medium output linearly polarized single-frequency laser and relates to the self-injection structure of a laser, in particular to a Tm<3+>:YAG (yttrium aluminum garnet) laser which performs end-pumped single-frequency self-injection. 785nm light enters a crystal from an end surface; end pumping is performed; a single longitudinal mode is selected by combining an F-P etalon with a volume grating, wherein the volume grating serves as an output cavity lens; after the light enters a light splitter, the generated laser enters a 1/2 wave plate and a Glan prism to form linearly polarized light; and a small part of light is reflected by a full-reflecting lens through a partial through lens, so that the linearly polarized light is re-injected into the crystal to be continuously oscillated to form a structure of a self-injection linearly polarized single-frequency laser. Due to the design of the whole machine, linearly polarized output in an isotropic crystal is realized by a self-injection method, and the linearly polarized and stable single-frequency laser with high power is obtained. The method is complete and accurate, and is applied to injection frequency locking technology study of a single Tm-doped isotropic medium including Tm<3+>:YAG. The application field includes the fields of optoelectronic countermeasure, laser radar, laser medicine and the like.

Description

technical field [0001] The invention relates to a self-injection structure for obtaining linearly polarized single-frequency laser output, in particular to a self-injection single-frequency Tm 3+ : The structure of YAG laser is suitable for the research of injection frequency locking technology, and its application fields include photoelectric countermeasures, laser radar, laser medical treatment, etc. Background technique [0002] The 2μm band laser produced by thulium-doped lasers is widely used in the fields of photoelectric countermeasures, lidar, and laser medical treatment due to its particular wavelength. First of all, the 2μm band laser can be used as a pumping source to generate 3-5μm and 8-12μm infrared lasers, which can be used for laser infrared directional jamming, which is an optoelectronic countermeasure technology for combating infrared missiles guided by the next generation of infrared staring focal plane detectors . Directional jamming is to concentrate t...

AI Technical Summary

Problems solved by technology

The external injection method is composed of two lasers, a seed laser and a power amplifier, but this method has high requirements on the stability and time synchronization of the two lasers. The self-injection method uses a laser to form a seed cavity and power cavity, so it is superior to the external injection method in terms of stability and synchronization. This is an important innovation and advantage of the present invention. Scholars at home and abroad have mainly focused on the external injection method for the research on seed injection technology, but the use of self-injection There are still many gaps in the research of lasers for seed laser injection, so mastering self-injection technology is more conducive to the research of injection frequency-locking technology, and will occupy a leading position in this research field

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