A simple external optical feedback system has been applied to a distributed feedback quantum cascade laser (DFB QCL) for cavity ring-down spectroscopy (CRDS) and a clear effect of feedback was observed. A long external feedback path length of up to 4m can decrease the QCL linewidth to around 50kHz, which is of the order of the transmission linewidth of our high finesse ring-down cavity. The power spectral density of the transmission signal from high finesse cavity reveals that the noise at frequencies above 20kHz is reduced dramatically.
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This article is part of the Topical Collection on Proceedings of the 10th International Workshop on Application of Lasers and Storage Devices in Atomic Nuclei Research: “Recent Achievements and Future Prospects” (LASER 2016), Poznań, Poland, 16–19 May 2016
Edited by Krassimira Marinova, Magdalena Kowalska and Zdzislaw Błaszczak
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Terabayashi, R., Sonnenschein, V., Tomita, H. et al. Optical feedback in dfb quantum cascade laser for mid-infrared cavity ring-down spectroscopy. Hyperfine Interact 238, 10 (2017). https://doi.org/10.1007/s10751-016-1390-6
- Optical feedback
- Quantum cascade laser
- Cavity ring–down spectroscopy