Compact narrow bandwidth, linearly polarized burst-mode fiber amplifier with high burst energy of 1 mJ

Abstract

We demonstrate a burst-mode operation of a compact high-power, narrow spectral bandwidth, linearly polarized picosecond fiber amplifier with a specially designed modulation mode. A home-made electronic driver was used to directly modulate a distributed Bragg reflector seed source laser in burst-mode operation with single-pulse duration of 200 ps. The intraburst pulse spacing and number of pulses within each burst could be simply adjusted by setting the electronic driver of the seed source as well as a frequency multiplier component, which was composed of cascaded 3dB fiber output couplers. The pulse-multiplied seed was amplified by a compact three-stage amplifier chain. High-power narrow spectral bandwidth linearly polarized laser emission was generated with average output power up to 100 W under pump power of 148 W. The slope efficiency was computed to be about 64.3% and the energy of each pulse burst was scaled to 1 mJ with a repetition rate of 100 kHz.