Formation of feedback loop for phase control of a fiber laser array
V.V. Kolosov1,2, M.E. Levitskii3, T.D. Petukhov1, G.V. Simonova4
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
2Tomsk Scientific Center SB RAS, Tomsk, Russia
3AO "NPP "Topaz", Tomsk, Russia
4Institute of Monitoring of Climatic and Ecological Systems of the Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia
Keywords: волоконный лазер, оптические фазированные решетки, когерентное сложение, контур обратной связи, fiber laser, optical phased arrays, coherent combining, feedback loop
Abstract
Methods for phasing of an array of radiation channels for coherent combining of linearly polarized fields of narrowband fiber lasers are considered. The high efficiency of operation of the internal feedback loop based on interference of peripheral sections of radiation (Gaussian beam tails) of the phased channels is demonstrated. This method is easy to implement. It allows scaling the power of optical phased arrays and does not require massive optical elements. Equations for calculation of the optical arrangement for implementation of the feedback loop are presented along with the results of experiment on coherent combining of three beams.
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