Variable-caliber multi-pass laser amplifier based on direct liquid cooling array distribution gain module

Abstract

The invention discloses a variable-caliber multi-pass laser amplifier based on a direct liquid cooling array distribution gain module. The variable-caliber multi-pass laser amplifier comprises the direct liquid cooling array distribution gain module, a pump light source system and a partition variable-caliber multi-pass amplification light path system. The pump light source system is used for injecting pump light into the gain module, so that the gain module generates laser gain; the partition variable-caliber multi-pass amplification light path system reflects the seed laser input into the amplifier, so that the seed laser passes through the gain module at least twice, and the caliber of the laser before entering the gain module every pass is amplified. According to the invention, the direct liquid cooling array type laser gain module with a large gain aperture is adopted, the crystal heat generation density is low, and effective heat management can be realized; by means of a multi-pass amplification mode with the caliber gradually increased, it is guaranteed that the light passing power density of each pass is consistent, and the laser extraction efficiency can be improved. Multi-pass amplification can be achieved through a single gain module, and the amplifier is small in size, light in weight and high in reliability.

Description

technical field [0001] The invention relates to the technical field of high-energy lasers, in particular to a multi-pass laser amplifier with variable-aperture partitions based on a direct liquid-cooled array distributed gain module. Background technique [0002] High average power all-solid-state lasers play an important role in frontier scientific research, national economy, national security and other fields, and are research hotspots and important directions in the laser field. At present, the United States, Japan, Russia and other technologically developed countries are competing to support the development of high-power all-solid-state lasers in the form of national plans; and one of the major directions of application. [0003] The severe thermal effect caused by the increase of laser power has become the core problem that limits the high average power and high beam quality laser output of all solid-state lasers. The main oscillator power amplifier is an effective wa...

AI Technical Summary

Problems solved by technology

But for such a laser, due to the single-pass side-pump method, the negative index absorption of the gain medium leads to uneven gain of the crystal, and uniform laser amplification cannot be achieved, resulting in low laser amplification efficiency and difficulty in obtaining high beam quality output.

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