title: High-power femtosecond fiber-feedback optical parametric oscillator based on periodically poled stoichiometric LiTaO3.
abstract: We demonstrate a synchronously pumped high-gain optical parametric oscillator with feedback through a fiber, using a passively mode-locked Yb:YAG thin-disk laser as a pump source. We obtain as much as 19-W average signal power at a wavelength of 1.45 microm in 840-fs pulses and 7.8 W of idler power at 3.57 microm. The repetition rate of the pulses is 56 MHz, and the transverse beam quality of the generated signal is M2 < 1.6.
authors.affiliation: Ultrafast Laser Physics, Swiss Federal Institute of Technology, ETH Hönggerberg-HPT, CH-8093 Zurich, Switzerland.
authors.forename: T
authors.initials: T
authors.lastname: Südmeyer
authors.forename: E
authors.initials: E
authors.lastname: Innerhofer
authors.forename: F
authors.initials: F
authors.lastname: Brunner
authors.forename: R
authors.initials: R
authors.lastname: Paschotta
authors.forename: T
authors.initials: T
authors.lastname: Usami
authors.forename: H
authors.initials: H
authors.lastname: Ito
authors.forename: S
authors.initials: S
authors.lastname: Kurimura
authors.forename: K
authors.initials: K
authors.lastname: Kitamura
authors.forename: D C
authors.initials: DC
authors.lastname: Hanna
authors.forename: U
authors.initials: U
authors.lastname: Keller