System for evaluating influence of thermal lens effect on coherent polarization synthesis system synthesis efficiency and method thereof

Abstract

The invention provides a system for evaluating the influence of the thermal lens effect on coherent polarization synthesis system synthesis efficiency and a method thereof. The system comprises N paths of coherent polarization synthesis systems, wherein N=2n and n=1,2,3......; most power of the laser outputted by the N paths of coherent polarization synthesis systems through beam combination is received by a power receiver through a first high reflectivity mirror and a second high reflectivity mirror, and small amount of power is focused by a focusing lens and then injected into a spot analyzer; and the spot analyzer is assembled on an electric control translation stage, the electric control translation stage is connected with a control and data processing system, and the control and dataprocessing system can adjust the position of the electric control translation stage and process the spot size and displacement information so as to obtain the influence of the thermal lens effect on the synthesis efficiency of N paths of coherent polarization synthesis systems. The influence of the external environment on the evaluation result in the conventional evaluation method can be reduced and the problem of limitation of the conventional measurement method for beam size measurement can be overcome.

Description

technical field [0001] The invention belongs to the field of strong laser technology, and in particular relates to a system and a method for evaluating the influence of thermal lens effect on the synthesis efficiency of a coherent polarization synthesis system. Background technique [0002] Coherent polarization synthesis technology, as an important technical means in the field of beam synthesis, has received extensive attention from many units at home and abroad, and has become a research hotspot in the field of intense lasers in recent years. [0003] The high-power coherent polarization combining system is mainly composed of three parts: multi-channel high-power all-solid-state amplifier, phase and optical path control system, transmitting and combining devices (beam expander collimation system, polarization state rotation system, polarization beam combining system, etc.). In a high-power coherent polarization combining system, due to the high power density irradiated on ...

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Problems solved by technology

[0004] Aiming at the influence of thermal lens effect on the coherent polarization synthesis system, the traditional evaluation method mainly relies on the wavefront detection system (such as Hartmann wavefront measuring instrument, four-wave shearing interferometer, etc.), the whole measurement system is expensive and easily affected by the external environment. (such as optical axis adjustment error, background noise, etc.)

In addition, the current commercial wavefront detection system has a small entrance pupil size, which cannot meet the beam measurement with a beam waist diameter of more than 5mm. Additional out-of-focus aberrations that affect measurement results

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