Numerical simulation about orthogonal single frequency dithering technique used in tilt control of fiber laser array

Zhixin Zhang; Dong Zhi; Yanxing Ma; Xiaolin Wang; Pu Zhou; Lei Si

doi:10.1117/12.2262336

13 January 2017 Numerical simulation about orthogonal single frequency dithering technique used in tilt control of fiber laser array

Zhixin Zhang, Dong Zhi, Yanxing Ma, Xiaolin Wang, Pu Zhou, Lei Si

Author Affiliations +

Proceedings Volume 10254, XXI International Symposium on High Power Laser Systems and Applications 2016; 1025405 (2017) https://doi.org/10.1117/12.2262336
Event: XXI International Symposium on High Power Laser Systems and Applications, 2016, Gmunden, Austria

Abstract

Beam combination of fiber laser array is an effective technique contributed to improve the brightness of fiber lasers. In order to realize high-efficiency CBC, challenges like phase distortion (mainly including piston and tilt phase aberrations) should be taken into consideration. Resent years, tilt phase aberrations control has been come true by adaptive fiber optics collimator using the stochastic parallel gradient descent (SPGD) algorithm. However, the convergence rate of tilt control system still cannot satisfy the needs of practical application. In order to increase the tilt control bandwidth, a new idea is put forward that applying the orthogonal single frequency dithering (OSFD) technique into tilt control, and numerical simulation has been completed. A hexagonal laser array with 7 elements has been simulated, and each element has a pair of initial tilt angles in horizontal and vertical direction. The initial tilt angles comply with normal distribution. In the same condition, tilt phase control has been realized through SPGD and OSFD individually, and the convergence steps (defined as the iteration steps that improve the normalized PIB above 0.9) with appropriate parameters are respectively about 20 (SPGD) and 7 (OSFD). Furthermore, tilt phase control of large number hexagonal array is simulated, and the results are as follows: for 19/37 elements, the least convergence steps are about 80/160(SPGD) and 19/55(OSFD). Comparing with SPGD algorithm, it is obvious that the OSFD has higher convergence rate and greater potential for tilt control application in large number coherent fiber laser array.

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Zhixin Zhang, Dong Zhi, Yanxing Ma, Xiaolin Wang, Pu Zhou, and Lei Si "Numerical simulation about orthogonal single frequency dithering technique used in tilt control of fiber laser array", Proc. SPIE 10254, XXI International Symposium on High Power Laser Systems and Applications 2016, 1025405 (13 January 2017); https://doi.org/10.1117/12.2262336

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KEYWORDS

Fiber lasers

Computer simulations

Numerical simulations

Signal detection

Modulation

Optical simulations

Detection and tracking algorithms

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