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.; Akikusa, N.; Yamanishi, M.; Giusfredi, G.; Cancio, P.; De Natale, P.
March 2013
Applied Physics Letters;3/25/2013, Vol. 102 Issue 12, p121117
Academic Journal
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.


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