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

Year: 2013

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.

Autors Affiliation: CNR-INO-Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125 Firenze, FI, Italy; LENS-European Laboratory for Non-Linear Spectroscopy, Via Carrara 1, 50019 Sesto Fiorentino, FI, Italy; CNR-IFN-Istituto di Fotonica e Nanotecnologie, Via Amendola 173, 70126 Bari, BA, Italy; Development Bureau Laser Device RD Group, Hamamatsu Photonics KK, Shizuoka 434-8601, Japan; Central Research Laboratories, Hamamatsu Photonics KK, Shizuoka 434-8601, Japan

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 × 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

Journal/Review: APPLIED PHYSICS LETTERS

Volume: 102 (12)      Pages from: 121117  to: 121117

More Information: This work was financially supported by Ente Cassa di Risparmio di Firenze, by the Extreme Light Infrastructure (ELI) European project, by the Laserlab-Europe Consortium in the ALADIN project framework, and by the Progetto Operativo Nazionale (PON) PON01_01525 Monitoraggio Innovativo per le Coste e l\’Ambiente Marino (MONICA) funded by Italian Ministry of Education, University and Research (MIUR).
KeyWords: Absolute frequency; Linewidth narrowing; Locking bandwidth; Mid-infrared quantum cascade; Mid-infrared spectroscopy; Molecular transitions; Optical frequency combs; Orders of magnitude, Carbon dioxide; Infrared devices; Infrared spectroscopy; Linewidth; Quantum cascade lasers; Uncertainty analysis, Laser mode locking
DOI: 10.1063/1.4799284

Citations: 60
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