17 February 2017 Demonstration of a 1 Joule, 500 W average power picosecond laser
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Abstract
We report the demonstration of a chirped pulse amplification laser system that produces 1.5 J pulses at 0.5 kHz repetition rate and 0.75 kW average power. These pulses are subsequently compressed resulting 1 J, ~5 ps duration pulses at 500 Hz repetition rate. The 8-pass main amplifier consists of two diode-pumped, cryogenic-temperature Yb:YAG active mirrors cooled by a thermally efficient, high capacity cryogenic-cooling system. This amplifier operates with an opticalto- optical efficiency of 37%. The amplified pulses have excellent beam quality with a measured M2 factor of ~ 1.3. Over 30 minutes of continuous operation, we measured a shot-to-shot pulse energy fluctuation of only 0.75% RMS over the nearly 1 million shots fired. This laser was employed to make the first demonstration of a compact, plasma-based EUV/soft x-ray laser operating at a repletion rate of 400 Hz. In this proof-of-principle demonstration, shaped 1 J pulses of picosecond duration were focused onto a rotating molybdenum target at grazing incidence. The resulting plasma is collisionally ionized to the Ni-like ionic stage where a large, transient population inversion results in production of bright λ = 18.9 nm laser pulses.
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Brendan A. Reagan, Brendan A. Reagan, Cory M. Baumgarten, Cory M. Baumgarten, Michael A. Pedicone, Michael A. Pedicone, Herman Bravo, Herman Bravo, Liang Yin, Liang Yin, Hanchen Wang, Hanchen Wang, Carmen S. Menoni, Carmen S. Menoni, Jorge J. Rocca, Jorge J. Rocca, } "Demonstration of a 1 Joule, 500 W average power picosecond laser", Proc. SPIE 10082, Solid State Lasers XXVI: Technology and Devices, 1008219 (17 February 2017); doi: 10.1117/12.2254225; https://doi.org/10.1117/12.2254225
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