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Compact CH4 sensor based on difference frequency mixing of diode lasers in quasi-phasematched LiNbO3
D G Lancaster1, R Weidner, D Richter
1Rice Quantum Institute, Rice University, Department of Electrical and Computer Engineering, Houston, TX 77005-1892, USA. davelanc@rice.edu
Optics Communications
|September 7, 2001
Abstract:
A compact, portable and robust room temperature CH4 sensor is reported. By difference frequency mixing a 500 mW alpha-DFB diode laser at 1066 nm and an erbium-doped fiber amplified 1574 nm DFB diode laser in periodically poled lithium niobate up to 7 (mu)W of narrowband radiation at 3.3 microns is generated. Real-time monitoring of CH4 over a 7 day period using direct absorption in an open-path multipass cell (L = 36 m) demonstrates a detection precision of +/- 14 ppb.