Compact CH4 sensor based on difference frequency mixing of diode lasers in quasi-phasematched LiNbO3. |
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| Authors: | D G Lancaster R Weidner D Richter F K Tittel J Limpert |
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| Affiliation: | Rice Quantum Institute, Rice University, Department of Electrical and Computer Engineering, Houston, TX 77005-1892, USA. davelanc@rice.edu |
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| 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. |
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