title: Ultrafast thin-disk multipass laser amplifier delivering 1.4 kW (4.7 mJ, 1030 nm) average power converted to 820 W at 515 nm and 234 W at 343 nm.
abstract: 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 M2= 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.
authors.forename: Jan-Philipp
authors.initials: JP
authors.lastname: Negel
authors.forename: André
authors.initials: A
authors.lastname: Loescher
authors.forename: Andreas
authors.initials: A
authors.lastname: Voss
authors.forename: Dominik
authors.initials: D
authors.lastname: Bauer
authors.forename: Dirk
authors.initials: D
authors.lastname: Sutter
authors.forename: Alexander
authors.initials: A
authors.lastname: Killi
authors.forename: Marwan Abdou
authors.initials: MA
authors.lastname: Ahmed
authors.forename: Thomas
authors.initials: T
authors.lastname: Graf