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Frequency stabilization of a quantum cascade laser by weak resonant feedback from a Fabry-Perot cavity

Published by National Institute of Standards and Technology | National Institute of Standards and Technology | Catalog Last Checked: August 02, 2025 at 02:29 PM | Dataset Last Updated: May 18, 2021
Data from peer-reviewed publication: G. Zhao et al., Frequency stabilization of a quantum cascade laser by weak resonant feedback from a Fabry-Perot cavity, Optics Letters. Frequency-stabilized mid-infrared lasers are valuable tools for precision molecular spectroscopy. However, their implementation remains limited by complicated stabilization schemes. Here we achieve optical self-locking of a quantum cascade laser to the resonant leak-out field of a highly mode-matched two-mirror cavity. The result is a simple approach to achieving ultra-pure frequencies from high-powered mid-infrared lasers. For short time scales (<0.1 ms), we report a linewidth reduction factor of 3×10^(-6) to a linewidth of 12 Hz. Furthermore, we demonstrate two-photon cavity-enhanced absorption spectroscopy of an N2O overtone transition near a wavelength of 4.53 um.

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  • DOI Access for Frequency stabilization of a quantum cascade laser by weak resonant feedback from a Fabry-Perot cavity

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    Fig. 1: Conceptualization and model for a quantum cascade laser coupled to a Fabry-Perot cavity by weak optical feedback.

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  • SHA256 File for Fig. 1: Conceptualization and model for a quantum cascade laser coupled to a Fabry-Perot cavity by weak optical feedback.

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    Fig. 4: QCL line width analysis - power spectral densities

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  • SHA256 File for Fig. 4: QCL line width analysis - power spectral densities

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    Fig. 5: Two-photon absorption spectroscopy of N2O in the mid-infrared

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  • SHA256 File for Fig. 5: Two-photon absorption spectroscopy of N2O in the mid-infrared

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