title: Close to transform-limited, few-cycle 12 µJ pulses at 400 kHz for applications in ultrafast spectroscopy.
abstract: Non-collinear optical parametric amplification has become the leading technology for amplifying few-cycle carrier-envelope phase (CEP) stable pulses to high energy at extreme repetition rates. In this work, a parametric amplifier system devoted to ultrafast photoionization experiments with coincidence detection is reported. The amplifier delivers CEP-stable few-cycle pulses with an average power of 5 W, and operates at repetition rates between 400 and 800 kHz. Close to transform-limited compression of the few-cycle pulses is achieved with minimized spatio-temporal distortions. Potential limitations introduced by spatio-temporal couplings to applications in attosecond science are analyzed. In particular, it is shown that pulse front tilt resulting from non-collinear amplification can considerably reduce the asymmetry in stereo above threshold ionization (stereo-ATI) experiments.
authors.forename: Federico J
authors.initials: FJ
authors.lastname: Furch
authors.forename: Achut
authors.initials: A
authors.lastname: Giree
authors.forename: Felipe
authors.initials: F
authors.lastname: Morales
authors.forename: Alexandria
authors.initials: A
authors.lastname: Anderson
authors.forename: Yicheng
authors.initials: Y
authors.lastname: Wang
authors.forename: Claus Peter
authors.initials: CP
authors.lastname: Schulz
authors.forename: Marc J J
authors.initials: MJ
authors.lastname: Vrakking