Flat-gain broadband neodymium glass amplifier based on birefringence filtering and gain method

Abstract

The invention discloses a flat-gain broadband neodymium glass amplifier based on birefringence filtering. The flat-gain broadband neodymium glass amplifier comprises a polarization controller, a birefringence filtering spectrum equalizer and a neodymium glass amplifier. The polarization controller is composed of a quarter wave plate and a half-wave plate which are successively arranged in an optical path. The birefringence filtering spectrum equalizer is composed of a polarizer, a phase delayer and a polarization analyzer, wherein the polarizer, the phase delayer and the polarization analyzer are successively arranged in the optical path. The polarization passing direction of the polarizer is same with that of the polarization analyzer. The phase delayer is fixed on a rotating adjusting frame. The neodymium glass amplifier comprises neodymium glass and a pumping light source. According to the flat-gain broadband neodymium glass amplifier, the neodymium glass broadband laser amplifier with the flat gain is constructed based on the birefringence filtering spectrum equalizer and the neodymium glass amplifier. Particularly, spectrum transmittance is adjusted by means of birefringence spectrum filtering technology; counter compensation is performed on the gain spectrum of a traditional neodymium glass amplifier; and finally a flat gain spectral line in a relatively wide spectrum range is realized.

Description

technical field [0001] The invention belongs to the field of neodymium glass amplifiers, and more specifically relates to a birefringence filter-based gain flat broadband neodymium glass amplifier and a gain method, which can level the gain spectrum of the neodymium glass amplifier within the 20nm spectral range. Background technique [0002] High-power laser technology is widely used in a variety of large-scale laser devices. The output pulse energy of these large-scale high-power laser devices can reach more than 2MJ. It has important application value in high energy density physics, inertial confinement nuclear fusion and other fields. At present, the technical route of high-power laser amplification based on neodymium glass amplifiers has been relatively mature. In large-scale high-power laser devices in various countries, neodymium glass has been widely used as a laser amplifier. [0003] However, current Nd-glass amplifier configurations are mainly concerned with the a...

AI Technical Summary

Problems solved by technology

Chirped pulse laser amplification technology requires a complex front-end system to generate chirped pulses as the signal light of the amplification system; hybrid glass amplifiers need to introduce new neodymium glass (such as silicate glass) as the amplifier, which greatly increases the power of the amplification system. complexity and cost

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