Open AccessCoherent beam combining of multi-wavelength lasers based on stochastic parallel gradient descent algorithm
Author(s) -
Xiaolin Wang,
Pu Zhou,
Yanxing Ma,
Haotong Ma,
Xiaojun Xu,
Zejin Liu,
Yuchen Zhao
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.5474
Subject(s) - optics , laser , amplifier , fiber laser , laser power scaling , physics , wavelength , laser beam quality , power (physics) , beam (structure) , brillouin scattering , materials science , optoelectronics , laser beams , cmos , quantum mechanics
Owing to the restriction of the stimulated Brillouin scattering (SBS) and other nonlinear effects, the output power of the single frequency amplifier is ar a level of about hundred watts. Multi-wavelength and non-single frequency seed laser will mitigate the SBS and improve the output power of the fiber laser amplifier. The coherent beam combining of the non-single frequency and/or multi-wavelength laser will greatly increase the total output power of the coherent beam combining as compared with the coherent beam combining of a single frequency laser. Based on the stochastic parallel gradient descent (SPGD) algorithm, coherent combining of four channel four-wavelength lasers is realized. In the close loop state, the mean power of the main-lobe is four times higher than that of the open-loop, approaching 75% of its ideal value. The coherent combining of the multi-wavelength and non-single frequency laser is demonstrated and an approach to the high power coherent beam combining is provided.