Laser coherent array distributed phase control system and control method

Abstract

The invention relates to a laser coherent array distributed phase control system and control method. The system comprises a laser coherent array output module and a distributed phase control module, wherein the distributed phase control module comprises a lenslet array, a plurality of secondary phase modulators, a plurality of optical fiber couplers, an optical fiber end cap, a plurality of photoelectric detectors, a primary phase control system and a secondary phase control system; a two-stage phase controller can effectively control wavefront information of array laser, and real-time control over the coherent combination effect of the array laser is achieved; and the optical fiber couplers perform pairwise coupling detection on the phase information of the array light beams without performing unified detection on the phase information of the whole array light beams, so that the phase control bandwidth of the system is improved. The laser coherent array distributed phase control system has the all-fiber feature, the pressure in the aspect of thermal management is reduced, and the compactness and operability of the system structure are improved.

Description

technical field [0001] The present application relates to the field of optical coherent combining technology, in particular to a laser coherent array distributed phase control system and control method. Background technique [0002] The fiber 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 patent: CA2278071A1, CN103513428A , CN106451055B, CN103346470B, CN110729628B), are widely used in active imaging and detection, directed energy and laser communication and other fields. [0003] figure 1 It is a structural schematic diagram of a coherent array phase control system in the prior art. The system includes a laser coherent array output module and a phase control module, wherein the laser array output module mainly includes a laser seed source 101,...

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Problems solved by technology

[0004] Since the energy of the central main lobe of the array beam far-field coherent synthesis is used as the evaluation function, such as Figure 1 shows that the phase control algorithm iteration time is approximately proportional to the power of one-half of the number of arrays, and as the number of arrays The increase of the algorithm iteration time will severely limit the phase control rate, reduce the phase control bandwidth, and then reduce the coherent combination effect; at the same time, using this kind of spatial optical path structure for phase control requires not only the spatial optical path adjuster 108 to adjust each laser optical distance, it is also necessary to use a laser beam combiner 109 to narrow the beams of the array and focus them on the same pinhole detector. Too many devices increase the weight and volume of the system, which not only reduces the compactness of the system structure, but also increases the Practical pressures such as thermal management in high power applications

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