Adjusting key parameters in SPGD algorithm for adaptive optics systems

He Xi; Pan Xudong; Yong Songlin; Zhang Shengshuai; Tian Junlin

doi:10.3788/HPLPB20132510.2527

Volume 25 Issue 10

Sep. 2013

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Article Navigation > High Power Laser and Particle Beams > 2013 > 25(10): 2527-2530

Zhou Xiaosong, Shen Huahai, Peng Shuming, et al. Thermal desorption behavior of ion-implanted helium from erbium and scandium films[J]. High Power Laser and Particle Beams, 2012, 24: 1169-1172. doi: 10.3788/HPLPB20122405.1169

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He Xi, Pan Xudong, Yong Songlin, et al. Adjusting key parameters in SPGD algorithm for adaptive optics systems[J]. High Power Laser and Particle Beams, 2013, 25: 2527-2530. doi: 10.3788/HPLPB20132510.2527

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Adjusting key parameters in SPGD algorithm for adaptive optics systems

doi: 10.3788/HPLPB20132510.2527

1.
Key Laboratory of Science and Technology on High Energy Laser,CAEP,P.O.Box 919-1013,Mianyang 621900,China; 2.Institute of Applied Electronics,CAEP,P.O.Box 919-1013,Mianyang 621900,China

Received Date: 2013-05-31
Rev Recd Date: 2013-07-22
Publish Date: 2013-09-22

Abstract

Abstract

The theory about stochastic parallel gradient descent(SPGD) algorithm and the use of SPGD algorithm for coherent beam combination are introduced. For solving the difficulty for adjusting the key parameters in SPGD algorithm, a new method of combining the hardware and software is proposed, which can online collect and analyze the experimental data and automatically adjust the key parameters in SPGD in real time. Experiments of 4 fiber-laser coherent beam combination are developed, in which different adjusting methods are compared. The results show that using new methods can efficiently achieve the value of the gain coefficient and the stochastic perturbation amplitude in SPGD algorithm. The experiments are profitable. The new method proposed in the paper is novel and effective, which can also guide the coherent beam combining experiments in the future.
- stochastic parallel gradient descent,
- coherent beam combination,
- gain coefficient,
- stochastic perturbation amplitude,
- real time adaption,
- fiber laser

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