title: 250 W average power, 100 kHz repetition rate cryogenic Yb:YAG amplifier for OPCPA pumping.
abstract: A cryogenically cooled, bulk Yb:YAG, four-pass amplifier delivering up to 250 W average power at 100 kHz repetition rate is reported. The 2.5 mJ amplified optical pulses show a sub-20 ps duration before temporal compression and a spectrum supporting a transform-limited duration of 3.6 ps. The power instabilities were measured to be <0.5% rms over 30 min at full power, and the spatial intensity profile showed a flat-top distribution and near diffraction-limited beam quality. This compact amplifier is an ideal source for pumping either near-IR or mid-IR optical parametric chirped pulse amplifiers.
authors.forename: L E
authors.initials: LE
authors.lastname: Zapata
authors.forename: F
authors.initials: F
authors.lastname: Reichert
authors.forename: M
authors.initials: M
authors.lastname: Hemmer
authors.forename: F X
authors.initials: FX
authors.lastname: Kärtner