Coherent beam combination of fiber laser array with multi-dithering

Yanxing, 马阎星 Ma; Xiaolin, 王小林 Wang; Pu, 周朴 Zhou; Haotong, 马浩统 Ma; Haichuan, 赵海川 Zhao; Xiaojun, 许晓军 Xu; Lei, 司磊 Si; Zejin, 刘泽金 Liu; Yijun, 赵伊君 Zhao

doi:10.3788/hplpb20102212.2803

Cited by 3 publications

(1 citation statement)

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“…Several approaches, such as heterodyne detection phase control technique [1][2] , stochastic parallel gradient descent (SPGD) algorithm phase control technique [3][4][5] , single frequency dithering technique [6] , multi-dithering technique [7] and simulated annealing algorithm phase control technique [8] , have been proposed to achieve locking phase. Particular algorithm module is used to stabilize the phase difference between beamlets, and the residual phase error should be controlled within 0.05λ, to insure the coherent efficiency higher than 90% [9] .…”

Section: Introductionmentioning

confidence: 99%

Simulation of phase noise for coherent beam combination

Huang

Tang

et al. 2015

SPIE Proceedings

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Active coherent beam combination has been a hot area of research for several years. Particular algorithm module is used to stabilize the phase difference between beamlets, and make them coherent. The phase noise increases with the raising power of laser output. Under low power condition, we simulate the phase noise of high power laser amplifier by the Arbitrary Function Generators (AFGs), and send them to the phase modulators to destabilize the phase, to test the performance of the phase lock algorithm. The experimental results show the feasibility.

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Section: Introductionmentioning

confidence: 99%

Simulation of phase noise for coherent beam combination

Huang

Tang

et al. 2015

SPIE Proceedings

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All-fiber active coherent combining via a fiber combiner

Li¹,

Zhao²,

Chen³

et al. 2013

Optics Communications

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Methodology of filter-type multi-dithering phase control for quasi parallel light interference

Jinhua¹,

Fei²

2018

Acta Phys. Sin.

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The quasi parallel light interference is one kind of basic ways to use the energy of interference light to interact with matter. Because the phase of each parallel light beam needs to meet the coherent condition, it is required that the phase of each light beam be controlled timely. There are some kinds of phase control methods, such as the heterodyne phase-locking method, the stochastic parallel gradient descent algorithm, the self-referred and self-synchronous phase-locking method the multi-dithering phase-locking method, etc. Among them, the multi-dithering method needs not the referenc light, it is to load multi-frequency sinusoid signals to the phase modulator, and realize the recognition of phase difference and the output of feedback voltage by multiplying circuit and integrating circuit. In view of the shortcomings of the existing methods, a scheme of filter-type multi-dithering phase control for quasi parallel light interference is proposed, in which the phase differences are identified and corrected by the modulation signals and filtering signals of different frequencies. Theoretical analysis of coherent light intensity for the scheme is made. The principle of filter-type multi-dithering phase control method is put forward, and the numerical analysis and simulation experiment for filter-type multi-dithering phase control method are carried out. In the simulation experiment, the fiber interference light path is used to simulate the light intensity of quasi parallel light interference at one point in space, and the change of photoelectric signal indicates the change of interference light intensity. The phase control feedback loop is composed of photoelectric signal amplifying circuit, bandpass filtering circuit, amplitude measuring circuit, direct current amplifying circuit and adder circuit. The results have shown that the phase difference among light beams can be recognized by the method, and the direct current voltage signal that is proportional to the phase difference of signal can be fed to control the phase modulator. The phase difference can be corrected. The control bandwidth is 2.5 kHz, and the output voltage range of phase control is 0.034.45 V. Compared with the classical multi-dithering method, the method of filter-type multi-dithering phase control has some advantages. Each multiplying circuit in the classical method needs a very small amplitude reference signal, which causes the reference signal to have a very small range of values, and the relationship between integral time and modulation period needs considering. The integral time is usually ten times longer than the modulation period, which causes the control bandwidth of the system to decrease. However, the feedback loop of the filter-type multi-dithering phase control method does not require any reference signal, so each signal does not affect each other, and the increase in the number of beams does not have a significant influence on the control bandwidth either. Therefore the filter-type multi-dithering phase control method is a useful phase-control method.

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Coherent beam combination of fiber laser array with multi-dithering

Cited by 3 publications

References 0 publications

Simulation of phase noise for coherent beam combination

Simulation of phase noise for coherent beam combination

All-fiber active coherent combining via a fiber combiner

Methodology of filter-type multi-dithering phase control for quasi parallel light interference

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