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

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

Research output: Contribution to journalArticlepeer-review


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 functionality compared to standard point detection methods. We further show that the upconversion detector system can be implemented as a simple replacement of the cryogenic detector. (C) 2014 Optical Society of America
Original languageEnglish
Pages (from-to)5321-5324
JournalOptics Letters
Issue number18
Publication statusPublished - 2014

Subject classification (UKÄ)

  • Atom and Molecular Physics and Optics


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