Abstract

We report on a widely (2.25 THz or $75{\mathrm{cm}}^{-1}$) and rapidly ($4.5\mathrm{THz}/\mathrm{s}$) mode-hop-free (MHF) tunable mid-IR laser source at $\sim 3.3\mathrm{\mu m}$, consisting of a 5%-$\mathrm{MgO}\text{:}{\mathrm{LiNbO}}_3$ singly resonant optical parametric oscillator (SRO) pumped by an automated broadly MHF tunable extended-cavity diode laser (ECDL). The broad and rapid MHF tuning capability of the ECDL is readily transferred to the SRO idler wave owing to the quasi-noncritical pump spectral acceptance bandwidth of the quasi-phase-matching. Fast and broadband high-resolution Doppler spectroscopy measurements of the ${\nu }_3$ band of ${\mathrm{CH}}_4$ are presented to illustrate the performance of the mid-IR optical parametric oscillator spectrometer.

© 2013 Optical Society of America

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