Journal
ACTA PHYSICA SINICA
Volume 59, Issue 2, Pages 973-979Publisher
CHINESE PHYSICAL SOC
DOI: 10.7498/aps.59.973
Keywords
fiber laser; coherent combining; stochastic parallel gradient descent algorithm; stochastic parallel gradient descent controller
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Funding
- Innovation Foundation for Graduates in National University of Defense Technology, China [B080702]
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Stochastic parallel gradient descent (SPGD) algorithm is one of the effective ways to realize high power fiber laser coherent combining of master oscillator power amplifier. The basic principle of the SPGD algorithm in the coherent combining is introduced, the SPGD phase controller has been designed and manufactured, and the representative experiment results are presented. Theoretical analysis shows that the iteration rate is 200000 per second, the average compensation bandwidth is about 12500 Hz, the minimal phase control error is 1/179 wavelength. Experiment shows that the SPGD controller can perform well in phase locking of two lasers, the average phase residual error is less than 1/25 wavelength when the amplitude of the phase noise is greater than lambda/10, and the frequency is 3 kHz.
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