2-μm 5-kHz PM DFB-FBG fiber seed laser in ns pulsed Tm-doped fiber amplifier

Coherent nanosecond pulses with high peak powers in the 2μm region are in demand for applications such as LIDAR and atmospheric sensing. In this paper we present a PM pulsed laser based on a MOPA configuration providing up to 50W of peak power. The 2039nm seed laser is a pre-amplified DFB-FBG laser with 10W of output peak power for 50ns pulses over repetition rates from 50kHz to 2MHz. For 4-μs pulses and a repetition rate of 50kHz, our MOPA delivers 28μJ of pulse energy.