Comb-assisted subkilohertz linewidth quantum cascade laser for high-precision mid-infrared spectroscopy

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 achi...

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Bibliographic Details
Published in:Applied physics letters 2013-03, Vol.102 (12)
Main Authors: Galli, I., Siciliani de Cumis, M., Cappelli, F., Bartalini, S., Mazzotti, D., Borri, S., Montori, A., Akikusa, N., Yamanishi, M., Giusfredi, G., Cancio, P., De Natale, P.
Format: Article
Language:English
Subjects:
ABSORPTION SPECTROSCOPY
CARBON DIOXIDE
CONVERSION
FREQUENCY MEASUREMENT
INFRARED SPECTRA
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
KHZ RANGE
LASER RADIATION
LASERS
LINE NARROWING
MODE LOCKING
STABILITY
TEMPERATURE RANGE 0273-0400 K
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Summary: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 2×10−12. This source has allowed the measurement of the absolute frequency of a CO2 molecular transition with an uncertainty of about 1 kHz.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4799284