We report on the linewidth narrowing of a room-temperature mid-infrared quantum cascade laser by phase-locking to a difference-frequency-generated radiation referenced to an optical frequency comb synthesizer. A locking bandwidth of 250 kHz, with a residual rms phase-noise of 0.56 rad, has been achieved. The laser linewidth is narrowed by more than 2 orders of magnitude below 1 kHz, and its frequency is stabilized with an absolute traceability of . This source has allowed the measurement of the absolute frequency of a CO2 molecular transition with an uncertainty of about 1 kHz.
Comb-assisted subkilohertz linewidth quantum cascade laser for high-precision mid-infrared spectroscopy
I. Galli, M. Siciliani de Cumis, F. Cappelli, S. Bartalini, D. Mazzotti, S. Borri, A. Montori, N. Akikusa, M. Yamanishi, G. Giusfredi, P. Cancio, P. De Natale; Comb-assisted subkilohertz linewidth quantum cascade laser for high-precision mid-infrared spectroscopy. Appl. Phys. Lett. 25 March 2013; 102 (12): 121117. https://doi.org/10.1063/1.4799284
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