title: Pump-seed synchronization for MHz repetition rate, high-power optical parametric chirped pulse amplification.
abstract: We report on an active synchronization between two independent mode-locked lasers using a combined electronic-optical feedback. With this scheme, seed pulses at MHz repetition rate were amplified in a non-collinear optical parametric chirped pulse amplifier (OPCPA). The amplifier was seeded with stretched 1.5 nJ pulses from a femtosecond Ti:Sapphire oscillator, while pumped with the 1 ps, 2.9 µJ frequency-doubled output of an Yb:YAG thin-disk oscillator. The residual timing jitter between the two oscillators was suppressed to 120 fs (RMS), allowing for an efficient and broadband amplification at 11.5 MHz to a pulse energy of 700 nJ and an average power of 8 W. First compression experiment with 240 nJ amplified pulse energy resulted in a pulse duration of ~10 fs.
authors.affiliation: Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany. hanieh.fattahi@mpq.mpg.de
authors.forename: Hanieh
authors.initials: H
authors.lastname: Fattahi
authors.forename: Catherine Yuriko
authors.initials: CY
authors.lastname: Teisset
authors.forename: Oleg
authors.initials: O
authors.lastname: Pronin
authors.forename: Atsushi
authors.initials: A
authors.lastname: Sugita
authors.forename: Roswitha
authors.initials: R
authors.lastname: Graf
authors.forename: Vladimir
authors.initials: V
authors.lastname: Pervak
authors.forename: Xun
authors.initials: X
authors.lastname: Gu
authors.forename: Thomas
authors.initials: T
authors.lastname: Metzger
authors.forename: Zsuzsanna
authors.initials: Z
authors.lastname: Major
authors.forename: Ferenc
authors.initials: F
authors.lastname: Krausz
authors.forename: Alexander
authors.initials: A
authors.lastname: Apolonski
mesh_terms: D000669:Amplifiers, Electronic; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005246:Feedback; D007834:Lasers; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*