title: Efficient, high-repetition-rate, femtosecond optical parametric oscillator tunable in the red.
abstract: We report efficient generation of tunable femtosecond pulses in the red by internal frequency doubling of an optical parametric oscillator (OPO) based on periodically poled LiNbO3 (PPLN). The OPO, based on a 1-mm-thick PPLN crystal, is synchronously pumped by a femtosecond Ti:sapphire laser at 810 nm, providing signal pulses across 1.33-1.57 microm at a 76 MHz repetition rate. Using a 1-mm-thick crystal of BiB3O6 (BIBO) internal to the OPO cavity, we achieve frequency doubling of signal pulses across 665-785 nm with up to 260 mW of average power for 1.51 W of pump. The high nonlinear gain and phase-matching acceptance in PPLN and BIBO permit convenient tuning across the full range by simple detuning of OPO cavity delay. Intracavity dispersion compensation results in near-transform-limited red pulses with durations down to 140 fs for 185 fs input pump pulses.
authors.affiliation: ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, Barcelona, Spain. adolfo.esteban@icfo.es
authors.forename: A
authors.initials: A
authors.lastname: Esteban-Martin
authors.forename: O
authors.initials: O
authors.lastname: Kokabee
authors.forename: M
authors.initials: M
authors.lastname: Ebrahim-Zadeh
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D008029:Lighting / Q000295:instrumentation*; D009991:Oscillometry / Q000295:instrumentation*