Frequency-comb-referenced quantum-cascade laser at 4.4 μm

Year: 2007

Authors: Bartalini S., Cancio P., Giusfredi G., Mazzotti D., De Natale P., Borri S., Galli I., Leveque T., Gianfrani L.

Autors Affiliation: CNR-Istituto Nazionale di Ottica Applicata, Largo E. Fermi 6, Firenze FI, 50125, Italy; European Laboratory for Non-linear Spectroscopy, Via Carrara 1, Sesto Fiorentino FI, 50019, Italy; Dipartimento di Fisica, Università di Firenze, Via Sansone 1, Firenze, FI, 50125, Italy; École Supérieure d’Optique, Institut d’Optique Théorique et Appliquée, Orsay Cedex, 91403, France; Dipartimento di Scienze Ambientali, Seconda Università di Napoli, CNISM-Unità Napoli 2, Via Vivaldi 43, Caserta CE, 81100, Italy

Abstract: We report what we believe to be the first absolute frequency measurement performed using a quantum-cascade laser (QCL) referenced to an optical frequency comb synthesizer (OFCS). A QCL at 4.43 mu m has been used for producing near-infrared radiation at 858 nm by means of sum-frequency generation with a Nd:YAG source in a periodically poled lithium niobate nonlinear crystal. The absolute frequency of the QCL source has been measured by detecting the beat note between the sum frequency and a diode laser at the same wavelength, while both the Nd:YAG and the diode laser were referenced to the OFCS. Doppler-broadened line profiles of (CO2)-C-13 molecular transitions have been recorded with such an absolute frequency reference. (c) 2007 Optical Society of America.

Journal/Review: OPTICS LETTERS

Volume: 32 (8)      Pages from: 988  to: 990

KeyWords: Molecular transitions; Nonlinear crystals; Optical frequency comb synthesizer (OFCS); Quantum-cascade laser (QCL); Sum-frequency generation, Doppler effect; Infrared radiation; Lithium compounds; Optical frequency conversion; Semiconductor lasers; Wavelength, Quantum chemistry
DOI: 10.1364/OL.32.000988

Citations: 56
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