title: Fiber-feedback optical parametric oscillator for half-harmonic generation of sub-100-fs frequency combs around 2 μm.
abstract: We demonstrate a femtosecond fiber-feedback optical parametric oscillator (OPO) at degeneracy. The OPO cavity comprises an 80-cm-long fiber composed of a combination of normal and anomalous dispersion sections that provide a net intracavity group delay dispersion close to zero. By using a mode-locked, Yb-doped fiber laser as the pump, we achieved half-harmonic generation of 250-MHz, 1.2-nJ nearly transform-limited 97-fs pulses centered at 2090 nm with a total conversion efficiency of 36%.
authors.forename: Kirk A
authors.initials: KA
authors.lastname: Ingold
authors.forename: Alireza
authors.initials: A
authors.lastname: Marandi
authors.forename: Michel J F
authors.initials: MJ
authors.lastname: Digonnet
authors.forename: Robert L
authors.initials: RL
authors.lastname: Byer