Piston phase regulation and control system and method of laser coherent array

Abstract

The invention relates to a piston phase regulation and control system and regulation and control method for a laser coherent array. A laser beam splitter equally divides seed laser into N+1 beams of sub-laser, a phase modulator, a laser amplifier, a laser collimator, a half-wave plate and a spectroscope are sequentially arranged on a transmission path of an ith path of sub-laser, and i is equal to1, 2,..., N; 99% of laser energy is transmitted to a first laser beam combiner to be combined and then outputted after being split by an ith spectroscope, and (1% of laser energy is transmitted to asecond laser beam combiner through an (N+i) th half-wave plate to be combined into array laser, then transmitted to a laser beam shrinking device and then incident to a camera; the (N+1) th path of sub-laser serves as reference light to enter the camera, the array laser and the reference light coincide at a target surface of the camera and interfere with each other, the camera outputs the interference image information to an image acquisition and phase control module, and the image acquisition and phase control module controls each phase modulator. The method is advantaged in that the polarization direction and the piston phase of each path of laser of the high-power coherent array can be flexibly regulated and controlled.

Description

technical field [0001] The invention relates to the technical field of optical coherent synthesis, in particular to a laser coherent array and a control method. Background technique [0002] Laser arrays can be widely used in laser communication, lidar and directed energy technology and other fields. The laser coherent array based on the master oscillator power amplification (English name is Master Oscillator Power Amplifier, referred to as MOPA) can realize synthetic aperture emission, increase the system emission aperture, and reduce the laser transmission divergence angle (see patents: CA2278071A1, US10250013B2, CN103513428A, CN106451055B, CN103346470B). If the polarization direction and piston phase of each laser can be flexibly adjusted through optical field regulation, array beams with special transmission characteristics such as vortex beams can also be obtained (see literature: High-power vortex beam generation enabled by aphased beam array fed at the nonfocal-plan...

AI Technical Summary

Problems solved by technology

However, the existing experimental system is difficult to achieve flexible control of the laser polarization direction and piston phase of the high-power coherent array

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