Femtosecond deep-infrared optical parametric oscillator pumped directly by a Ti:sapphire laser

Callum O'Donnell; Chaitanya Kumar S.; Kevin T. Zawilski; Peter G. Schunemann; Majid Ebrahim-Zadeh

doi:10.1117/12.2287559

15 February 2018 Femtosecond deep-infrared optical parametric oscillator pumped directly by a Ti:sapphire laser

Callum O'Donnell, Chaitanya Kumar S., Kevin T. Zawilski, Peter G. Schunemann, Majid Ebrahim-Zadeh

Proceedings Volume 10516, Nonlinear Frequency Generation and Conversion: Materials and Devices XVII; 1051610 (2018) https://doi.org/10.1117/12.2287559
Event: SPIE LASE, 2018, San Francisco, California, United States

Abstract

We report a high-repetition-rate femtosecond optical parametric oscillator (OPO) for the deep-infrared (deep-IR) based on the nonlinear optical crystal, CdSiP₂ (CSP), pumped directly by a Ti:sapphire laser, for the first time. By pumping CSP at <1 μm, we have achieved practical output powers at the longest wavelengths generated by any Ti:sapphire-pumped OPO. Using a combination of pump wavelength tuning, type-I critical phase-matching, and cavity delay tuning, we have generated continuously tunable radiation across 6654−8373 nm (1194−1503 cm^-1) at 80.5 MHz repetition rate, providing up to 20 mW of average power at 7314 nm and <7 mW beyond 8000 nm, with idler spectra exhibiting bandwidths of 140−180 nm across the tuning range. Moreover, the near-IR signal is tunable across 1127−1192 nm, providing up to 37 mW of average power at 1150 nm. Signal pulses, characterised using intensity autocorrelation, have durations of ∼260–320 fs, with corresponding time-bandwidth product of ∆υ∆τ∼1. The idler and signal output exhibit a TEM00 spatial profile with single-peak Gaussian distribution. With an equivalent spectral brightness of ∼6.68×10²⁰ photons s^-1 mm^-2 sr^-1 0.1% BW^-1, this OPO represents a viable table-top alternative to synchrotron and supercontinuum sources for deep-IR applications in spectroscopy, metrology and medical diagnostics.

Conference Presentation

Citation Download Citation

Callum O'Donnell, Chaitanya Kumar S., Kevin T. Zawilski, Peter G. Schunemann, and Majid Ebrahim-Zadeh "Femtosecond deep-infrared optical parametric oscillator pumped directly by a Ti:sapphire laser", Proc. SPIE 10516, Nonlinear Frequency Generation and Conversion: Materials and Devices XVII, 1051610 (15 February 2018); https://doi.org/10.1117/12.2287559

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