16 March 2016 High peak power ultrafast Cr:ZnSe oscillator and power amplifier
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Abstract
Q-Peak Inc. has developed a Cr:ZnSe based femtosecond oscillator – power amplifier laser operating in the 2.5-μm region. The system generates 1 mJ per pulse at a 1-kHz repetition rate with a pulse duration of 184 fs, corresponding to a peak power of 5 GW. To the best of our knowledge this represents a record power for this spectral region. The highpeak power source utilizes a hybrid laser architecture, combining efficient fiber-laser pumping with solid state crystals. A Tm:fiber laser pumped, SESAM-initiated, Cr:ZnSe femtosecond oscillator provides a seed for chirped pulse amplification. The oscillator outputs 50-fs pulses that are stretched in a grating pulse stretcher and then amplified in a chain consisting of a regenerative amplifier and two stages of linear amplifiers all based on Cr:ZnSe. The pump power for amplification is provided by a Q-switched, high repetition rate, Ho:YLF laser, which in turn, is pumped by a high power Tm:fiber laser. The amplified pulses are compressed by a grating pulse compressor, resulting in 1 W of average power at a 1-kHz repetition rate. This laser system represents the state-of-the-art in short-pulse duration, pulse energy, and beam quality in this IR spectral range.
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Evgeny Slobodchikov, Logan R. Chieffo, Kevin F. Wall, "High peak power ultrafast Cr:ZnSe oscillator and power amplifier", Proc. SPIE 9726, Solid State Lasers XXV: Technology and Devices, 972603 (16 March 2016); doi: 10.1117/12.2212793; https://doi.org/10.1117/12.2212793
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