Polarized Light Multipass Amplifier Based on Stitched Crystals

Abstract

A polarized light multi-pass amplifier based on a spliced crystal comprises a polaroid, a Faraday polarization apparatus, a first total reflective mirror, a second total reflective mirror, a third total reflective mirror, a fourth total reflective mirror, a spliced crystal, a fifth total reflective mirror, a first 1 / 2 wave plate and a second 1 / 2 wave plate. The light beam polarizing angle of a light beam of the multi-pass amplifier in a transmission and amplification process is 45 degrees, thus the spliced crystal is formed by splicing crystals whose C axes are 45 degrees, difference of polarization states of linearly polarized light is utilized, a two-pass amplifier structure is utilized to realize traditional four-pass amplification, the incident angle alpha when a seed light beam is incident to the crystal is reduced, finally, the area of a seam of the spliced crystal on a light spot projection plane is reduced, and the amplification efficiency is improved. The two 1 / 2 wave plates are placed in a pumping light path, and has no influence on the state of the seed light beam, thereby saving cost, and ensuring the reliability of the amplifier.

Description

technical field [0001] The invention relates to a laser amplifier, in particular to a polarized light multi-pass amplifier based on spliced ​​crystals. Background technique [0002] The Chirped-Pulse-Amplification (CPA) system has higher and higher energy requirements, which makes the crystal (titanium sapphire) diameter larger and larger, and the crystal growth period of a large diameter is long and expensive. Secondly, when the seed pulse is amplified by the crystal, the parasitic oscillation (Parasitic Lasing, PL for short) generated in the crystal greatly consumes the energy storage of the crystal, which seriously affects the spot quality and amplification efficiency of the amplified output pulse, and with the As the crystal aperture increases, parasitic oscillations are more likely to occur. Crystal splicing technology can effectively suppress the generation of parasitic oscillations, and at the same time, it can form crystals with larger apertures, which solves the ab...

AI Technical Summary

Problems solved by technology

If the C-axis of the crystal is used according to the general amplifier method, that is, the polarization state of s or p light, it is necessary to use a wave plate to adjust the polarization state of the seed beam to meet the requirements of the crystal, and the broadband wave plate has a wide bandwidth and high process requirements, so it is not suitable Obtain the high quality products required

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