Abstract

We report on a high-power femtosecond optical parametric oscillator (OPO) at 80 MHz repetition rate, tunable across 6318–7061 nm in the deep-infrared (deep-IR) using pump wavelength tuning. The OPO, based on ${\mathrm{CdSiP}}_2$ (CSP), is synchronously pumped by a commercial Ti:sapphire-pumped femtosecond OPO in the near-IR, enabling rapid static tuning of the CSP OPO with minimal adjustments to its cavity length. The deep-IR CSP OPO provides as much as 32 mW of average idler power at 6808 nm with spectral bandwidth $>1000\mathrm{nm}$ (at $-10\mathrm{dB}$ level) across the tuning range. By implementing intracavity dispersion control, near-transform-limited signal pulses of $\sim 100\mathrm{fs}$ duration with smooth single-peak spectrum are achieved at 1264 nm, corresponding to an idler wavelength at 6440 nm. To the best of our knowledge, this is the first time such practical idler powers in the deep-IR have been generated from a dispersion-compensated CSP femtosecond OPO at sub-100 MHz repetition rate.

© 2016 Optical Society of America

Ti:sapphire-pumped deep-infrared femtosecond optical parametric oscillator based on CdSiP₂

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