A polygonal crystal for solid-state lasers and all-solid-state lasers

Abstract

A polygonal crystal for a solid laser comprises a laser crystal 1 and bonded crystals 2 located at both ends of the laser crystal 1, wherein the laser crystal 1 and the bonded crystals 2 have regularly pentagonal cross sections; the laser crystal 1 uses one of a neodymium-doped yttrium lithium fluoride crystal, a thulium-doped yttrium lithium fluoride crystal, a thulium-holmium-codoped yttrium lithium fluoride crystal, and a holmium-doped yttrium lithium fluoride crystal; the bonded crystals 2 are yttrium lithium fluoride crystals. The polygonal crystal and an all-solid-state laser of the invention use the regularly pentagonal laser crystal and the bonded crystals made of the yttrium lithium fluoride material, suppress the generation of self-oscillation in the crystal to the utmost extentby using side pumping, and realize high-energy high-efficiency laser output.

Description

technical field [0001] The invention relates to a polygonal crystal used for a solid-state laser and an all-solid-state laser, belonging to the technical field of solid-state lasers. Background technique [0002] High-energy and high-efficiency laser diode-pumped all-solid-state lasers are widely used in space lidar, space photoelectric countermeasures, and laser medical treatment. One of the research focuses and hot spots of all-solid-state lasers is how to improve the laser output energy and conversion efficiency. One of the important factors restricting the development of high-energy and high-efficiency all-solid-state lasers is the self-oscillation effect of solid-state gain crystals, which leads to the fact that the output energy cannot be increased after reaching a certain level. Solid gain medium refers to the material that can generate stimulated radiation. Common gain mediums include neodymium doped yttrium aluminum garnet crystal (Nd:YAG), thulium doped yttrium al...

AI Technical Summary

Problems solved by technology

[0004] Due to the center symmetry of the traditional rod-shaped crystal, self-excited oscillation will be formed at the intersection of the center line and the circumference in any cross-section of the crystal. Generally, roughening or polishing coating is selected for the side surface, and the coating process is difficult; Self-excited oscillation will also occur, which limits the increase in output energy. In addition, the slab crystal is not uniformly pumped, and the quality of the laser beam generally generated is poor.

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