An optical parametric oscillator (OPO), pumped by a fiber-amplified diode laser, is combined with off-axis integrated cavity output spectroscopy (OA-ICOS). The cw OPO (power , tunability , mode-hop-free tuning) has a tuning speed of , which is ideal for rapid and sensitive trace gas detection. Combined with OA-ICOS, a detection limit of 50 parts per trillion by volume () of ethane () in nitrogen was obtained in at , corresponding to a noise equivalent absorption sensitivity of . The system demonstrates real-time measurements of methane and water in exhaled human breath.
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