Journal
OPTICS EXPRESS
Volume 23, Issue 16, Pages 21064-21077Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.021064
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Funding
- German Federal Ministry of Education and Research (BMBF) [13N11787, 13N11789]
- German Research Foundation (DFG)
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We report on an Yb:YAG thin-disk multipass laser amplifier delivering sub-8 ps pulses at a wavelength of 1030 nm with 1420 W of average output power and 4.7 mJ of pulse energy. The amplifier is seeded by a regenerative amplifier delivering 6.5 ps pulses with 300 kHz of repetition rate and an average power of 115 W. The optical efficiency of the multipass amplifier was measured to be 48% and the beam quality factor was better than M-2 = 1.4. Furthermore we report on the external second harmonic generation from 1030 nm to 515 nm using an LBO crystal leading to an output power of 820 W with 2.7 mJ of energy per pulse. This corresponds to a conversion efficiency of 70%. Additionally, 234 W of average power were obtained at the third harmonic with a wavelength of 343 nm. (C) 2015 Optical Society of America
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