Upconversion detection of long-wave infrared radiation from a quantum cascade laser

Yu-Pei Tseng*, Christian Pedersen, Peter Tidemand-Lichtenberg

*Corresponding author for this work

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Broadly tunable upconversion is demonstrated for long-wave infrared (LWIR) detection. The upconversion system is evaluated by the detection of 50 ns pulses from a narrow linewidth tunable quantum cascade laser (QCL) in the 9.4 to 12 mu m range. The LWIR signal is mixed with a 1064 nm laser beam in a silver gallium sulfide (AgGaS2) crystal, resulting in an upconverted signal in the 956 to 977 nm range, using angle tuning for optimal phase-matching. This allows for efficient, high speed detection using a standard silicon detector. A theoretical model including absorption and diffraction shows qualitative agreement with experimental data. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Original languageEnglish
JournalOptical Materials Express
Issue number5
Pages (from-to)1313-1321
Publication statusPublished - 2018

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