Gain medium plate bar with sandwich structure and its making method

Abstract

A sandwich structure gain medium strip comprises a doping area which is composed of medium material doped with active ion and undoping area composed of medium material, the undoping area is arranged in the middle layer of the strip, the doping area is arranged at the upper and lower surfaces of the strip to clamp the undoping area therein, the thickness of the doping area is less than that of theundoping area and the width / thickness ratio of the sandwich structure gain medium strip is larger than 2; the sandwich structure gain medium strip of the invention can guarantee the higher heat load character of the whole gain medium strip, at the same time the enough rigidity of the strip is sustained and the optical precise manufacturing is facilitated. Besides, as the existence of the undopingarea at the middle layer the clear aperture of the strip is larger than the ultra-thin strip and the operation of the short pulse laser is facilitated.

Description

technical field [0001] The invention relates to solid-state laser technology, in particular to a solid-state gain laser medium applied to high-power slab lasers. Background technique [0002] Laser beams with high average power and high beam quality are widely used. In the military, they can be used as hard-killing laser weapons. In industrial processing, they can be used for metal and non-metal cutting and welding. Existing methods for generating high average power lasers: rod-shaped gain medium, slab-shaped gain medium, and sheet-shaped gain medium. The gain medium is processed into a slab shape, so that the beam is transmitted in a "zigzag" shape in the laser crystal. The design of the pump and cooling structure ensures that there is only one-dimensional heat flow in the gain medium crystal slab, and the thermal effect is compensated by the zigzag optical path. The output power is increased and the beam quality is improved; therefore, solid-state lasers using slab-struct...

AI Technical Summary

Problems solved by technology

The light cross-sectional area of ​​the gain medium slab with this structure is small, which is conducive to continuous operation, but not conducive to short-pulse high-energy laser output

On the other hand, the optical processing of ultra-thin and large-sized gain medium is difficult, which limits the application of this kind of structured laser

At present, the design of active mirror lasers using sheet-like structure gain media also uses ultra-thin structure gain media, whether it is the thin-sheet active mirror laser invented by Adolf.Geissen of the University of Stuttgart, or John.Vetrovec of Boeing The new concept of pressure-adsorption compact active mirrors all need to face the difficulty of ultra-thin crystal processing. More importantly, this structure needs to achieve uniform pumping in two-dimensional directions on the light-transmitting surface of the gain medium, which is also very difficult. technical challenge

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