Abstract

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 1.2W, tunability 34μm, 5cm1 mode-hop-free tuning) has a tuning speed of 100THz/s, which is ideal for rapid and sensitive trace gas detection. Combined with OA-ICOS, a detection limit of 50 parts per trillion by volume (1×1012) of ethane (C2H6) in nitrogen was obtained in 0.25s at 2997cm1, corresponding to a noise equivalent absorption sensitivity of 4.8×1011cm1Hz1/2. The system demonstrates real-time measurements of methane and water in exhaled human breath.

© 2010 Optical Society of America

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