Laser multi-pass amplifier based on tandem connection of two discs

Abstract

The invention discloses a laser multi-pass amplifier based on tandem connection of two discs. The laser multi-pass amplifier based on tandem connection of the two discs comprises a first parabolic reflector, a second parabolic reflector, a third parabolic reflector, a fourth parabolic reflector, a first disc laser crystal and a second disk laser crystal, wherein the first parabolic reflector, the second parabolic reflector, the third parabolic reflector and the fourth parabolic reflector are arranged coaxially in sequence, the first parabolic reflector and the second parabolic reflector are arranged in a conjugated mode, and the third parabolic reflector and the fourth parabolic reflector are arranged in a conjugated mode; the surface of the first parabolic reflector is provided with a pumping light incident hole and a seed laser incident hole, and the center of the first parabolic reflector is hollowed out for containing the first disc laser crystal; the center of the fourth parabolic reflector is hollowed out for containing the second disc laser crystal; the center of the second parabolic reflector and the center of the third parabolic reflector are hollowed out. Through the laser multi-pass amplifier based on tandem connection of the two discs, the optical length of the disc laser crystals can be extended, the spontaneous radiation effect of laser is restrained, the power of output laser is increased, and the equivalent thickness of the disc laser crystals is increased; consequently, the pumping frequency of the disc laser crystals is increased, the absorption efficiency of the pumping light is improved, and the power of the output laser is further improved.

Description

technical field [0001] The invention belongs to the field of laser technology, and more specifically relates to a laser multi-pass amplifier based on double-disc serial connection. Background technique [0002] Disk solid-state laser is a high-end high-power solid-state laser. The essential difference between it and traditional solid-state lasers lies in the shape of the laser working material. Disk lasers will not use traditional rod-shaped crystals but disk crystals. The thickness of the disk laser crystal is 0.2mm ~ 0.4mm. The pump light is incident from the front of the crystal. Since the pumping light will generate a lot of heat during the pumping process of the disk laser crystal, it is necessary to cool the crystal, otherwise the crystal will It is easy to crack; cooling is usually realized on the back of the crystal. Since the disc crystal is very thin and has a large diameter-to-thickness ratio, the cooling effect of the disc crystal is good, which is conducive to o...

AI Technical Summary

Problems solved by technology

[0005] First, the pump light multi-pass transmission scheme of the symmetrical conjugated double parabolic mirrors The pump cavity is only composed of two parabolic mirrors and a disc laser crystal, the absorption efficiency of the pump light is too low, resulting The number of energy-level particles is too small to achieve high-power laser output

[0006] Second, the existence of the correction mirror in the pump light multi-pass transmission scheme of the symmetrical conjugate double parabolic mirror will increase the spontaneous emission effect of the laser, consume too many upper-level particles, and reduce the efficiency of the entire system and output laser power of

[0007] Third, when the implementation of dual-channel pumping is adopted, the unabsorbed pump light will eventually exit from the corresponding incident hole, which may burn the pump light generator

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