Compact CH4 sensor based on difference frequency mixing of diode lasers in quasi-phasematched LiNbO3

Date

2000

Authors

Lancaster, D.
Weidner, R.
Richter, D.
Tittel, F.
Limpert, J.

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Journal article

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Optics Communications, 2000; 175(4-6):461-468

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D.G. Lancaster, R. Weidner, D. Richter, F.K. Tittel and J. Limpert

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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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Copyright 2000 Elsevier Science B.V. All rights reserved.

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