Abstract
We report a high-repetition-rate femtosecond optical parametric oscillator (OPO) for the deep-infrared (deep-IR) based on type-I critical phase-matching in (CSP), pumped directly by a Ti:sapphire laser. Using angle-tuning in the CSP crystal, the OPO can be continuously tuned across 7306–8329 nm () in the deep-IR. It delivers up to 18 mW of idler average power at 7306 nm and beyond 8000 nm at 80.5 MHz repetition rate, with the spectra exhibiting bandwidths of across the tuning range. Moreover, the signal is tunable across 1128–1150 nm in the near-infrared, providing up to 35 mW of average power in pulses at 1150 nm. Both beams exhibit single-peak Gaussian distribution in spatial profile. With an equivalent spectral brightness of , this OPO represents a viable alternative to synchrotron and supercontinuum sources for deep-IR applications in spectroscopy, metrology, and medical diagnostics.
© 2018 Optical Society of America
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