title: Ti:sapphire-pumped deep-infrared femtosecond optical parametric oscillator based on CdSiP2.
abstract: We report on a femtosecond optical parametric oscillator (OPO) for the deep-infrared (deep-IR) based on the Kerr-lens-mode-locked Ti:sapphire laser as the pump source. By deploying a novel cascaded intracavity arrangement, comprising a femtosecond OPO based on the nonlinear crystal, CdSiP2, synchronously pumped internal to a MgO:PPLN femtosecond OPO, we have generated broadly tunable radiation across 5958-8117 nm using rapid static cavity delay tuning, with a maximum power of 64 μW at 6791 nm, limited by the absorption in mirror substrates as well as polarization-dependent intracavity losses. The deep-IR idler power exhibits excellent passive stability of better than 1.1% rms over 2 h, with a spectral bandwidth as large as ∼650 nm at ∼6800 nm. The demonstrated concept is generic and can be similarly deployed in other operating time scales and wavelength regions, also using different laser pump sources and nonlinear materials.
authors.forename: V
authors.initials: V
authors.lastname: Ramaiah-Badarla
authors.forename: S
authors.initials: S
authors.lastname: Chaitanya Kumar
authors.forename: A
authors.initials: A
authors.lastname: Esteban-Martin
authors.forename: K
authors.initials: K
authors.lastname: Devi
authors.forename: K T
authors.initials: KT
authors.lastname: Zawilski
authors.forename: P G
authors.initials: PG
authors.lastname: Schunemann
authors.forename: M
authors.initials: M
authors.lastname: Ebrahim-Zadeh