A Coherent Beam Combination Method of Ultrashort Pulse Laser Based on Splicing Locking and Far Field

Abstract

The invention provides an ultrashort pulse laser coherent beam combination method based on splicing locking and a far field. The method comprises the following content: after laser generated by a high-repetition-frequency femtosecond laser source is split, the laser is transmitted through different optical path chains, and finally, passes through a sampling module and a focusing module and realizes beam coherent enhancement superposition at a focus point. The sampling module and the focusing module are formed by splicing a plurality of elements or directly utilizing a whole piece of element, so that inter-beam dynamic errors are not introduced when the beams are transmitted. A monitoring and control system simultaneously collects inter-beam spectrum interference signals and far-field signals independent of each sub-beam and far-field signals synthesized between the sub-beams so as to judge inter-beam relative errors; and the errors are compensated by an error compensation module, thereby realizing coherent beam combination of laser pulses at the focus point and obtaining ultrastrong laser output.

Description

technical field [0001] The invention relates to a method for coherent beam combining of ultrashort pulse lasers, in particular to a method for coherent beam combining of ultrashort pulse lasers based on splicing locking and far field. Background technique [0002] High-energy, ultra-short, and ultra-intensive lasers have important application value in frontier scientific fields such as material science and strong field physics. However, due to the limitations of various nonlinear effects and component damage, the output capability of single-channel lasers is far from satisfying With increasingly high application requirements, coherent beam combining is an important way to improve the output capability of the system. [0003] Coherent beam combining can use fewer laser beams to obtain higher focused power density, but there are many factors that affect the effect of coherent beam combining (such as vibration and optical path misalignment, amplifier thermal distortion, tempera...

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Problems solved by technology

At present, some common technologies such as photocells, oscilloscopes, and streak cameras cannot be used for the detection and control of such high-precision errors.

K. L. Baker et al proposed an interferometric adaptive optics testbed for laserpointing, wave-front control and phasing, OPTICS EXPRESS, 17(19), 2009 based on fiber backhaul laser near the focus, but near the focus It is inconvenient to add detection elements, which not only occupies the target space, but also is not easy to implement. At the same time, this solution is not convenient to increase the control bandwidth

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