Abstract

We report the generation of up to 0.7 mW of narrow-linewidth <60MHz radiation at 3.3 µm by difference frequency mixing of a Nd:YAG-seeded 1.6-W Yb fiber amplifier and a 1.5µm diode-laser-seeded 0.6-W Er/Yb fiber amplifier in periodically poled LiNbO3. A conversion efficiency of 0.09%/W 0.47 mWW-2 cm-1 was achieved. A room-air CH4 spectrum acquired with a compact 80-m multipass cell and a dual-beam spectroscopic configuration indicates an absorption sensitivity of ±2.8×10-5 ±1σ, corresponding to a sub-parts-in- 109 ppb CH4 sensitivity (0.8 ppb).

© 1999 Optical Society of America

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