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 2 x 10(-12). This source has allowed the measurement of the absolute frequency of a CO2 molecular transition with an uncertainty of about 1 kHz. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4799284]
Comb-assisted subkilohertz linewidth quantum cascade laser for high-precision mid-infrared spectroscopy
Galli, I;Siciliani de Cumis , M.;Cappelli, F;Bartalini, S;Mazzotti, D;Borri, S;Montori, A;Giusfredi, G;Cancio Pastor, P;De Natale, P
2013
Abstract
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 2 x 10(-12). This source has allowed the measurement of the absolute frequency of a CO2 molecular transition with an uncertainty of about 1 kHz. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4799284]File | Dimensione | Formato | |
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