Abstract
This study presents the first ever demonstration of self-difference frequency generation (DFG) under random quasi-phase-matching (RQPM) in a polycrystalline Cr:ZnSe gain medium. An RQPM-based self-DFG Cr:ZnSe laser was developed with broad vibronic spectroscopic properties along with a wide phase-matching spectral bandwidth, offering ultrabroad tunability of nanosecond mid-infrared pulses in the 7.6–16 µm spectral range by pumping with a Tm:YAG laser at 2.013 µm. Trace detection of N2O was performed by multi-pass absorption spectroscopy using an electronically tuned self-DFG output, controlled by an acousto-optic tunable filter. The proposed laser source is expected to find applications in the real-time monitoring of volatile organic compounds through differential absorption spectroscopy.
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