|
This article is cited in 11 scientific papers (total in 11 papers)
Control of laser radiation parameters
A high-speed, high-efficiency phase controller for coherent beam combining based on SPGD algorithm
Zh. M. Huang, C. L. Liu, J. F. Li, D. Y. Zhang Institute of Fluid Physics, China Academy of Engineering Physics,
China
Abstract:
A phase controller for coherent beam combining (CBC) of fibre lasers has been designed and manufactured based on a stochastic parallel gradient descent (SPGD) algorithm and a field programmable gate array (FPGA). The theoretical analysis shows that the iteration rate is higher than 1.9 MHz, and the average compensation bandwidth of CBC for 5 or 20 channels is 50 kHz or 12.5 kHz, respectively. The tests show that the phase controller ensures reliable phase locking of lasers: When the phases of five lasers are locked by the improved control strategy with a variable gain, the energy encircled in the target is increased by 23 times than that in the single output, the phase control accuracy is better than λ/20, and the combining efficiency is 92%.
Keywords:
coherent optics, fibre laser arrays, beam combining, stochastic parallel gradient descent, phase controller.
Received: 16.05.2013 Revised: 14.10.2013
Citation:
Zh. M. Huang, C. L. Liu, J. F. Li, D. Y. Zhang, “A high-speed, high-efficiency phase controller for coherent beam combining based on SPGD algorithm”, Kvantovaya Elektronika, 44:4 (2014), 301–305 [Quantum Electron., 44:4 (2014), 301–305]
Linking options:
https://www.mathnet.ru/eng/qe15230 https://www.mathnet.ru/eng/qe/v44/i4/p301
|
Statistics & downloads: |
Abstract page: | 198 | Full-text PDF : | 71 | References: | 24 | First page: | 6 |
|