A mode with spontaneous periodic polarization switching of the Yb-doped double-clad fiber laser radiation was experimentally observed. Switching between two mutually orthogonal linear polarizations arose at pump powers exceeding some critical value, and the period of switching decreased as the pump power increased. At the pump power higher than the threshold but lower than the critical value, the Yb-doped fiber laser output radiation was linearly polarized (the degree of polarization was 0.95±0.03).
Department of Optics and Spectroscopy, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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