Multi-rod symmetrical series connection cavity of solid laser

Abstract

The invention relates to a multi-rod symmetrical series connection cavity of a solid laser, which belongs to the technical field of solid lasers. The output power of a laser is improved by connecting a plurality of crystal rods in a resonant cavity in series in the prior art; however, the series connection quantity of the crystal rods can not be more added in the resonant cavity due to the limit of a parameter of a crystal rod damage threshold value, and the series connection quantity n of the crystal rods is smaller than or equal to 8 commonly. Both ends of the resonant cavity are respectively provided with a total reflecting mirror, and an output coupling mirror is positioned in the middle of the resonant cavity; and two groups of n crystal rods are respectively arranged between the output coupling mirror and the total reflecting mirrors at both ends of the resonant cavity, the n crystal rods in each group are separated and connected in series, and the two groups of crystal rods are symmetrical relative to a laser output axis of the output coupling mirror. When the output coupling mirror adopts a Glan prism group, one fourth lambda+ / -delta lambda wave plates are respectively arranged in the fronts of the total reflecting mirrors at both ends of the resonant cavity. The invention is applied to a solid laser.

Description

technical field [0001] The invention relates to a multi-rod symmetrical series connection cavity of a solid-state laser, which realizes laser output power amplification and belongs to the technical field of solid-state lasers. Background technique [0002] In order to obtain high-power laser, the measure of the prior art closest to the present invention is to connect polycrystalline rods in series in the resonant cavity, the laser output power increases in proportion to the number of rods, and the output beam quality of a single rod remains almost unchanged. A document entitled "Research on the Stability of Double-rod Tandem Nd:YAG Lasers" (Wang Hailin, "Optoelectronics·Laser", Volume 14, No. 2, February 2003) discloses a dual-rod cascaded cavity program, see figure 1 As shown, by pumping two crystal rods connected in series, they are in the particle beam inversion state, and one of the crystal rods will start to oscillate first to generate a laser signal, which is coherent...

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Problems solved by technology

[0003] However, due to the limitation of the crystal rod damage threshold parameter, the number of crystal rods connected in series cannot be increased in the resonator cavity. Usually, the number of crystal rods connected in series is n≤8, see figure 1 As shown, therefore, the measures to increase the laser output power simply by increasing the number of crystal rods connected in series are limited

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