24 January 2011 Narrow linewidth quantum cascade lasers as ultra-sensitive probes of molecules
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Abstract
Recently, we have demonstrated that the "intrinsic" linewidth of Quantum Cascade Lasers (QCLs) can go beyond the radiative lifetime of the upper level. This represents the first demonstration of a sub-radiative linewidth for any laser. The intrinsic linewidth of a QCL can be as narrow as hundreds Hz, paving new ways for ultra-sensitive and precise harnessing and detection of molecules. We are working towards full exploitation of such intrinsic properties by designing appropriate phase-lock loops and enhancement-cavities for interaction with molecules. Combination with optical-frequency-comb-synthesizers and appropriate spectroscopic techniques, like saturated-cavity-ring-down-SCAR or polarization spectroscopy can provide unprecedented sensitivity and frequency accuracy for molecular detection.
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Saverio Bartalini, Simone Borri, Pablo Cancio Pastor, Iacopo Galli, Giovanni Giusfredi, Davide Mazzotti, Paolo De Natale, "Narrow linewidth quantum cascade lasers as ultra-sensitive probes of molecules", Proc. SPIE 7945, Quantum Sensing and Nanophotonic Devices VIII, 794505 (24 January 2011); doi: 10.1117/12.871401; https://doi.org/10.1117/12.871401
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