We report on a widely (2.25 THz or ) and rapidly () mode-hop-free (MHF) tunable mid-IR laser source at , consisting of a 5%- 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 band of are presented to illustrate the performance of the mid-IR optical parametric oscillator spectrometer.
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