Abstract
We report a high-peak-power, single-polarized master oscillator power amplification system employing polarization- maintaining Yb-doped rod-type photonic crystal fiber. The MOPA system comprises of a Q-switched microchip laser generating ~630ps pulses at 8.6 kHz repetition-rate and two amplification stages employing double cladding fiber and rod-type PCF respectively. The MOPA system obtains narrow spectral bandwidth, single-polarized pulses of 9W maximum output average power, corresponding to peak power of 1.7MW.
Highlights
High-peak-power, single-polarized laser sources operating in sub-nanosecond regime are widely used in a range of applications including frequency conversion [1], material processing [2] and remote sensing[3]
The master oscillator power amplification (MOPA) system comprises of a Q-switched microchip laser generating ~630ps pulses at 8.6 kHz repetition-rate and two amplification stages employing double cladding fiber and rod-type photonic crystal fiber (PCF) respectively
After pre-amplification, there is average power ~500mW filtered pulses coupled into rod-type PCF
Summary
High-peak-power, single-polarized laser sources operating in sub-nanosecond regime are widely used in a range of applications including frequency conversion [1], material processing [2] and remote sensing[3]. Rare-earthdoped fiber lasers and amplifiers with single-polarization, narrow spectral linewidth, high signal-to-noise ratio and excellent beam quality offer manifest advantages in the applications above. In 2005, Fabio Di Teodoro et al [4] reported a three-stage amplifier generating pulses whose peak power in excess of 4.5MW while pulse duration was 450ps and repetition rateswas 13.4 kHz. In 2010, Shaif-ul Alam et al [5] introduced a single-polarized master oscillator power amplification (MOPA) system with output peak power of 39 kW at 20ps pulse duration 113.8MHz repetition rate. In 2007, a ~ 85ps pulse duration, 105 kHz repetition-rate, 3MW peak power Yb-doped fiber amplifier exhibiting narrow spectrum and diffraction-limited beam quality was reported by O
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