Laser regenerative amplifier based on disc gain medium

Abstract

The invention discloses a laser regenerative amplifier based on a disc gain medium. The laser regenerative amplifier comprises a seed light source, an optical fiber coupling collimation module, a regenerative amplification resonant cavity, a pumping module and an optical isolator, wherein the regenerative amplification resonant cavity comprises a first polaroid, a Faraday rotator, a 1 / 2 wave plate, a second polaroid, a Pockels cell, a 1 / 4 wave plate, a first cavity mirror, a third cavity mirror, a fourth cavity mirror, a fifth cavity mirror, a disc gain medium, a seventh cavity mirror and an eighth cavity mirror, the first cavity mirror, the third cavity mirror and the fifth cavity mirror are concave mirrors, and the fourth cavity mirror, the seventh cavity mirror and the eighth cavity mirror are plane mirrors. Seed light oscillates in the regenerative amplification resonant cavity in a reciprocating mode, energy is amplified after the seed light passes through the disc gain medium every time, the lower thermal lens effect is achieved, the amplification efficiency linearization degree and the pulse stability are high, and extremely high light beam quality can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of laser pulse amplification, in particular to a laser regenerative amplifier based on a disk gain medium. Background technique [0002] Due to the increasing demand for laser fine processing, ultrafast (picosecond / femtosecond) lasers are an indispensable tool. At present, ultrafast laser pulses are mainly realized by mode-locking technology. The average power is generally in milliwatts, and the single pulse energy is in the order of nanojoules, which limits its application in the field of industrial processing. In order to obtain a higher power ultrafast laser, it is necessary to amplify the seed laser output from the mode-locked oscillator cavity. At present, there are two methods of ultrafast laser pulses generated by mode-locking technology: traveling wave amplification and regenerative amplification. Traveling wave amplification means that the seed laser passes through the laser gain medium in a single...

AI Technical Summary

Problems solved by technology

The thermal lens effect of the rod-shaped gain medium regenerative amplification resonator is very serious at high power, it is difficult to achieve high average power output and the quality of the laser beam is not high due to the influence of thermal distortion

Although the slab gain medium regenerative amplification resonator can also achieve high power and large single pulse energy amplification, because of the elongated shape of the slab gain medium itself, its output spot is also elongated, and its divergence angle in the XY direction and The beam quality is inconsistent, requiring complex shaping optical path to achieve circular spot output

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