Abstract
Abstract Narrow-linewidth and linearly polarized operation at high repetition rate of an all-fiber gain-switched Thulium-doped fiber laser is presented. The laser produces stable 135 ns pulses with maximum average output power of 960 mW at repetition rate of 500 kHz, corresponding to maximum pulse energy of 1.92 μJ and a slope efficiency of 55.1% with respect to 1.55 μm pump power. The center wavelength of 1926.7 nm with a spectral bandwidth of
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