Laser amplifier

Abstract

The invention discloses a laser amplifier which comprises a semiconductor laser, a first optical shaping system, a resonant cavity, a spatial light modulator, a computer and an amplification cavity. The optical shaping system I, the resonant cavity, the spatial light modulator, the computer and the amplification cavity are sequentially arranged at the tail end of the semiconductor laser; the spatial light modulator is controlled by a computer and is used for regulating and controlling the laser mode of the resonant cavity for outputting the seed light; and the semiconductor laser generates pump light, the emitted pump light is transmitted by the optical shaping system I and is sequentially injected into the resonant cavity and the amplification cavity, and amplified laser is output. The device has the characteristics of compact structure, uniform discharge, high pumping efficiency, convenient laser mode change, high mode purity and the like, and can effectively prevent the nonlinear effect of high-power continuous single-mode laser and high-power picosecond and femtosecond laser; and high-power laser output under the conditions of high light beam quality, good atmosphere and optical fiber transmission characteristics and high processing efficiency is realized.

Description

technical field [0001] The invention belongs to the technical field of lasers, and more specifically relates to a laser amplifier. Background technique [0002] With the development of science and technology, gravitational wave detection, laser precision displacement measurement, laser energy industry, laser industrial processing, aerospace and defense fields have an increasing demand for high beam quality, high efficiency and high power laser output in different modes. Based on the above requirements, a novel laser amplifier based on the master-controlled oscillator power amplifier (MOPA) structure of spatial light modulation (SLM) is proposed. [0003] For lasers, the gain medium is the core, which determines the wavelength of the output beam, and has a decisive influence on the power level and beam mode of the laser. The gain medium of high-power laser light source mainly experiences YAG rod-shaped gain medium (difficult to obtain fundamental mode output)—CO 2 The devel...

AI Technical Summary

Problems solved by technology

Although the existing external cavity reshaping methods (such as spiral phase plate, etched glass diffractive optical device and other optical devices) can obtain a single high-order mode, but for a gravitational wave interferometer, the converted basic transverse mode should be composed of a single-frequency, Ultra-stable high-power laser emission, the process is a huge challenge

The mode conversion can also be achieved by introducing the intracavity phase, but an additional phase plate needs to be designed, which is not conducive to changing the laser mode sequence

Even though the SLM modulation technology known as "digital laser" can easily obtain high-order Laguerre high-order modes (LG), it cannot directly obtain high-order LG modes under high-power conditions due to the limitation of laser damage threshold.

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