Compact gain-switching linearly polarized high-power Yb pulse fiber laser

A compact gain-switching pumped linearly polarized high-power Yb pulse fiber laser is experimentally demonstrated. The laser was mainly composed of a piece of polarization-maintaining (PM) Yb-doped fiber and a pair of PM FBGs. Three fiber pig-tailed laser diodes (LDs) were applied as the pump source through a (6+1) × 1 fiber coupler and configured in a pulse-working scheme. Stable pulse operation was achieved with repetition rate up to 200 kHz, pulse duration of 120 ns and a spectral FWHM of 0.08 nm. A maximum average laser output power of 21 W was obtained at 200 kHz with respect to the pump power of 30.3 W. The polarization extinction ratio was as good as 15 dB.