Experimental study of gain-switched high repetition rate pulse fiber laser

A gain-switched high repetition rate pulse all fiber laser pumped by pulsed laser diode is developed. The linear cavity laser with fiber Bragg grating was designed in which directly modulated laser diode was used as the pump source, the double cladding fiber was the gain medium. Stable laser pulse trains were obtained by testing different peak pump power and the cavity length. Under peak pump power of 21 W and pulse duration of 2.5 s at repetition rate of 100 kHz, stable laser pulse trains were obtained at 1.06 m with pulse duration of 247 ns. The values of laser pulse peak power have good consistency, and the long term average power stability is proved to be less than 2%. The sub-pulses on top of the envelope caused by longitudinal mode beating were observed and analyzed. The output power of single stage amplifier is 89.6 W.