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Coherent beam combining of multi-wavelength lasers based on stochastic parallel gradient descent algorithm

Wang Xiao-Lin Zhou Pu Ma Yan-Xing Ma Hao-Tong Xu Xiao-Jun Liu Ze-Jin Zhao Yi-Jun

Coherent beam combining of multi-wavelength lasers based on stochastic parallel gradient descent algorithm

Wang Xiao-Lin, Zhou Pu, Ma Yan-Xing, Ma Hao-Tong, Xu Xiao-Jun, Liu Ze-Jin, Zhao Yi-Jun
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  • Received Date:  23 October 2009
  • Accepted Date:  12 November 2009
  • Published Online:  05 April 2010

Coherent beam combining of multi-wavelength lasers based on stochastic parallel gradient descent algorithm

  • 1. College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, China

Abstract: 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.

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