Method for decreasing thermal capacitance laser medium thermal stress

Abstract

The disclosed method to reduce the thermal stress of thermal-capacity laser medium comprises: during laser emitting, heating the un-pumping area of laser medium to decrease the temperature difference to pumping area and thereby reduce thermal stress.

Description

technical field [0001] The invention belongs to the technical field of solid-state lasers, in particular to a method for reducing thermal stress of a heat capacity laser medium. Background technique [0002] Compared with other types of lasers, solid-state lasers pumped by semiconductor lasers have output characteristics such as multi-wavelength, short-wavelength, tunable, short-pulse, and high repetition rate. They are widely used in defense industry, industrial processing, aerospace, medical and other fields. application prospects. [0003] For a long time, solid-state lasers ( S solid S tate L Aser, referred to as SSL) output power has been restricted by waste heat generated during work, it is difficult to obtain a high average power output. Although the laser diode (LD)-pumped solid-state laser (DPSSL) improves the light-to-light conversion efficiency and effectively reduces the generation of waste heat, most SSL systems still need real-time cooling during operation,...

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Problems solved by technology

However, in the actual working process, due to the existence of pumping area (effective light aperture) and non-pumping area in the laser medium, as well as the uneven distribution of pumping light, it will be inside the medium, especially in the optical aperture The edge of the medium, the thermal stress in the medium is much larger than the thermal stress in the ideal (that is, the aperture = pumping area), which not only affects the improvement of the output power of the laser medium, but also affects the beam quality of the output laser

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