Low-noise mid-IR upconversion detector for improved IR-degenerate four-wave mixing gas sensing

Lasse Høgstedt, Jeppe Seidelin Dam, Anna-Lena Sahlberg, Zhongshan Li, Marcus Alden, Christian Pedersen, Peter Tidemand-Lichtenberg

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Abstract

We compare a nonlinear upconversion detector with a conventional cryogenic InSb detector for the detection of coherent infrared light showing near-shot-noise-limited performance in the upconversion system. The InSb detector is limited by dark noise, which results in a 500 times lower signal-to-noise ratio. The two detectors are compared for the detection of a coherent degenerate four-wave mixing (DFWM) signal in the mid-infrared, and applied to measure trace-level acetylene in a gas flow at atmospheric pressure, probing its fundamental rovibrational transitions. In addition to lower noise, the upconversion system provides image information of the signal, thus adding new func- tionality compared to standard point detectionmethods.We further show that the upconversion detectorsystem can be implemented as a simple replacement of the cryogenic detector.
Original languageEnglish
JournalOptics Letters
Volume39
Issue number18
Pages (from-to)5321-5324
ISSN0146-9592
DOIs
Publication statusPublished - 2014

Bibliographical note

This paper was published in Optics Letters and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/ol/abstract.cfm?uri=ol-39-18-5321. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

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