Multi-pass total reflection laser amplification module

Abstract

A multi-pass total reflection laser amplification module includes a cuoid laser gain medium, an optical fiber coupling semiconductor pumping source, a seed source and a planar dichroscope. The multi-pass total reflection laser amplification module has advantages that the amplification module is small in size and the transmission optical path lengths of seed laser and pumping laser in the gain medium are comparatively large, so that the pumping light can be absorbed completely; the mode matching of the pumping light and the seed laser is comparatively good, so that the seed laser can be amplified completely and light-light conversion efficiency is high; at the same time; the thickness of the strip gain medium is small and the cooling area is large, so that the temperature gradient in the strip thickness direction is reduced. The multi-pass total reflection laser amplification module facilitates the realization of output of laser with high power and high optical quality.

Description

technical field [0001] The invention relates to laser amplification, in particular to a multi-pass total reflection laser amplification module. Background technique [0002] Miniaturized laser devices are widely used in aviation and space exploration. Laser devices must not only meet miniaturization, but also achieve high power and high beam quality output. However, it is difficult for a single oscillation-level laser to meet these two requirements at the same time. For this reason, the main oscillation and multi-stage amplification are usually used to obtain a laser with high power, high energy and high beam quality. [0003] The structure of a laser amplifier device usually includes three main parts: seed laser, pump light and gain medium. The output power of the seed laser is low, but the beam quality is very good, close to the diffraction limit. The amplification gain medium can be divided into dye, gas, crystal, ceramic and glass according to the type of gain medium; ...

AI Technical Summary

Problems solved by technology

However, due to their own physical and chemical properties, the gain medium is rarely suitable for lasers with high power, high beam quality and miniaturization using traditional slab, rod and fiber structures.

Alternatively, other multipass amplifiers such as figure 2 As shown, refer to the scheme of CN101877454B), because it is a system composed of multiple lenses, which increases the complexity and instability of the system, and there are two kinds of lasers passing through the seed laser at the incident surface and the exit surface at the same time, the seed laser The size is limited; the total reflection amplification module such as image 3 The scheme shown (see CN102916327A) can only be applied to cube modules, and the shape of the slab amplification medium cannot be selected according to the actual crystal shape, and the seed laser has energy loss on the exit surface during use

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