Annular-spot chip amplifier

Abstract

The invention provides an annular-spot chip amplifier. By the annular-spot chip amplifier, annular laser beams, with high beam quality and low power, obtained by the aid of an unstable cavity can pass through different aperture areas of a same chip gain medium or chip gain medium sequence conveniently and repeatedly in different beam sizes, equal-flux laser extraction with high laser power density is realized, ASE (amplified spontaneous emission) is suppressed effectively, high optical to optical conversion efficiency is realized, and temperature gradient and temperature to optical distortion caused by non-uniform radial laser on a chip can be further avoided.

Description

technical field [0001] The invention relates to the field of solid-state lasers, in particular to an annular spot thin slice amplifier. Background technique [0002] Laser technology has developed rapidly since the 1960s. At the same time, it has interpenetrated with other high-tech and has been widely used in many fields such as material processing, medical treatment, military affairs, measurement and scientific experiment research. Among them, the laser amplifier with MOPA structure adopts high-beam quality and low-power laser output laser to easily achieve high-beam quality and high-power laser output through one-stage or multi-stage power amplification of the laser amplifier. [0003] At present, in the field of solid-state lasers, extensive and in-depth research and development of amplifiers have been carried out at home and abroad. However, the amplifier gain medium configurations currently used in this field are mainly rod-shaped, slat-shaped or optical fiber. [00...

AI Technical Summary

Problems solved by technology

This requires high requirements on the parameters of the parabola, the angle and curvature of the reflector, and the optical parameters of the thin slice crystal. In addition, only the seed laser with a specific beam far-field divergence angle and a specific beam waist position is injected into the multiple amplification optical path to achieve the above multiple amplification. , and this parameter window is very narrow

Moreover, in the process of multi-pass amplification, the laser off-axis is reflected by the parabola, and the coma aberration will lead to the deformation of the laser spot on the sheet and the obvious deterioration of the quality of the final output laser beam.

Therefore, it is very difficult for this scheme to achieve high beam quality laser amplification.

[0008] Moreover, both of the above two implementations are designed for the enlargement of the solid spot. If the hollow spot that is convenient for the Cassegrain system is injected into the above two multiple amplification systems, or because it is impossible to sequentially image with high quality in the self-reproducing optical element sequence ; or because it cannot form a spot matching the gain area on the sheet after being transformed by the parabolic reflection, it cannot achieve efficient multi-pass amplification

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