20 February 2014 Upconversion enhanced degenerate four-wave mixing in the mid-infrared for sensitive detection of acetylene in gas flows
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Abstract
We present a new background free method for in situ gas detection that combines degenerate four-wave mixing with an infra-red light detector based on parametric frequency upconversion of infra-red light. The system is demonstrated at mid infrared wavelengths for low concentration measurements of acetylene diluted in a N2 gas flow at ambient conditions. It is demonstrated that the system is able to cover more than 100 nm in scanning range and detect concentrations as low as 3 ppm based on the R9e line. A major issue in small signal measurements is scattered light and it is showed how a spatial analysis can be used to reduce this level.
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Lasse Høgstedt, Lasse Høgstedt, Jeppe Seidelin Dam, Jeppe Seidelin Dam, Anna-Lena Sahlberg, Anna-Lena Sahlberg, Zhongshan Li, Zhongshan Li, Marcus Aldén, Marcus Aldén, Christian Pedersen, Christian Pedersen, Peter Tidemand-Lichtenberg, Peter Tidemand-Lichtenberg, } "Upconversion enhanced degenerate four-wave mixing in the mid-infrared for sensitive detection of acetylene in gas flows", Proc. SPIE 8964, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XIII, 89641H (20 February 2014); doi: 10.1117/12.2039243; https://doi.org/10.1117/12.2039243
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