Synchronous upconversion of quantum cascade lasers in AgGaS2

Rasmus L. Pedersen, Peter Tidemand-Lichtenberg, Christian Pedersen*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review


We investigate synchronous upconversion of a pulsed, tunable quantum cascade laser (QCL) in the important 5.4–10.2 µm range, with a 30 kHz, Q-switched, 1064 nm laser. The possibility to accurately control the repetition rate and pulse duration of the QCL results in a good temporal overlap with the Q-switched laser, leading to an upconversion quantum efficiency of 16% in a 10 mm-long AgGaS2 crystal. We investigate the noise properties of the upconversion process in terms of pulse-to-pulse energy stability and timing jitter. For QCL pulses in the 30–70 ns range the upconverted pulse-to-pulse stability is approximately 1.75%. The demonstrated combination of broad tunability and high signal to noise in the system is well-suited for mid-IR spectral analysis of highly absorbing samples.

Original languageEnglish
JournalOptics Letters
Issue number21
Pages (from-to)5622-5625
Publication statusPublished - 2022


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