Coherent beam combination system for an optical feedback ring cavity of a pulsed fiber amplifier array

Abstract

The invention relates to a coherent beam combination system for an optical feedback ring cavity of a pulsed fiber amplifier array, which comprises a seed source and is characterized in that the ring cavity is formed by a beam combiner, a chopper, an optical fiber preamplifier, a beam splitter, two or more than two amplifying links, a lens and a feedback optical fiber entering the beam combiner along the direction of a laser outputted by the seed source; the input end of the feedback optical fiber is positioned on a back focus of the lens; the output ends of a plurality of amplifying links in each amplifying link ensure that light beams are outputted in a collimating manner and are not overlapped, and the directions of the light beams and an axis of the lens are coupled into the input end of the feedback optical fiber through the lens in parallel; and the seed source is a continuous laser. The coherent beam combination system has the advantages of simple principle and easiness in adjustment, overcomes the defect that a traditional passive beam combination method can not realize the multi-path high-repetition rate frequency and the phase lock output of a pulse laser with narrow pulse width and improves the brightness outputted by the pulsed fiber amplifier array with narrow pulse width and high peak power.

Description

technical field [0001] The invention relates to an optical fiber amplifier, in particular to a pulsed optical fiber amplifier array optical feedback ring cavity coherent bundle system, which is used to improve the brightness of the pulsed optical fiber amplifier with narrow pulse width and high peak power. Background technique [0002] In the application of high peak power, narrow pulse width pulsed fiber laser and amplifier, people have higher and higher requirements for output laser brightness. In addition to trying to increase the brightness of a single fiber laser or amplifier, the output pulses of multiple pulsed fiber lasers or amplifiers can be superimposed in time and space by using beam-grouping technology to increase the output brightness. The existing spectral beam combining technology has limited improvement in brightness; active coherent beam combining technology is limited by complex phase control technology and nonlinear effects, and it is difficult to realize...

AI Technical Summary

Problems solved by technology

The existing spectral beam combining technology has limited improvement in brightness; active coherent beam combining technology is limited by complex phase control technology and nonlinear effects, and it is difficult to realize multi-channel, high peak power pulse beam combining; other passive coherent technology Limited by the feedback mechanism, it is difficult to achieve pulse bundling with narrow pulse width and high repetition rate

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