Fiber laser coherent combining system based on adaptive precision light path adjustment

Abstract

The invention provides a fiber laser coherent combining system based on adaptive precision light path adjustment. In the system, a light beam output by a laser seed source is amplified by a pre-amplification module and then split by a beam splitter module; all the light beams pass through a primary application array, a phase modulator array, a light path rough adjustment device, a primary light path fine adjustment device, a secondary amplification module, a collimator system array and a secondary light path fine adjustment device; then, all the output light beams are combined by a beam combining device; then, the combined light beam enters a synthetic beam processing module, and a part of light is separated out by the synthetic beam processing module and then is fed in a photoelectric detection module; the photoelectric detection module is capable of converting an optical signal into an electric signal which then enters a control system; the control system is capable of processing the electric signal so as to respectively provide a control signal to the phase modulator array, the primary light path fine adjustment device and the secondary light path fine adjustment device, thus locking phases among all the light beams and compensating light paths among all the light beams in an adaptive way. The fiber laser coherent combining system based on adaptive precision light path adjustment can be applied to a multi-laser coherent combining system.

Description

technical field [0001] The invention relates to the field of strong lasers, and is an adaptive precision optical path adjustment system based on a fiber laser coherent combination system. Background technique [0002] Compared with other solid-state lasers / amplifiers, fiber lasers / amplifiers have many advantages such as good beam quality, high conversion efficiency, and convenient thermal management. In recent years, with the emergence of large mode field double-clad (LMA-DC) fibers and the rapid development of semiconductor pumping technology, fiber lasers have developed at an astonishing rate and have been applied to various fields such as industrial processing, medical treatment, and national defense. . However, limited by the thermal effect of the fiber itself, nonlinear effects, pumping technology, mode instability and other factors, there is a limit to the output power of a single fiber laser / amplifier. The active phase-locked coherent combination technology based on...

AI Technical Summary

Problems solved by technology

However, for an actual coherent combining system, the optical path difference between the various beams will continue to change due to factors such as external environmental disturbances, jitter introduced by the water cooling system, and output power fluctuations.

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