Lamb-dip-locked quantum cascade laser for comb-referenced IR absolute frequency measurements

Year: 2008

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

Autors Affiliation: INOA, CNR, I-50125 Florence, Italy; European Lab Non Linear Spect, I-50019 Florence, Italy; Univ Florence, Dipartimento Fis, I-50019 Florence, Italy; CNISM Unita Napoli 2, I-81100 Caserta, Italy; Univ Naples 2, Dipartimento Sci Ambientali, I-81100 Caserta, Italy

Abstract: The frequency of a DFB quantum cascade laser (QCL) emitting at 4.3 μm has been long-term stabilized to the Lamb-dip center of a CO2 ro-vibrational transition by means of first-derivative locking to the saturated absorption signal. Thanks to the non-linear sum-frequency generation (SFG) process with a fiber-amplified Nd:YAG laser, the QCL mid-infrared (IR) radiation has been linked to an optical frequency-comb synthesizer (OFCS) and its absolute frequency counted with a kHz-level precision and an overall uncertainty of 75 kHz.

Journal/Review: OPTICS EXPRESS

Volume: 16 (15)      Pages from: 11637  to: 11646

KeyWords: Carbon dioxide; Locks (fasteners); Quantum cascade lasers; Semiconductor lasers, Absolute frequency; Absolute frequency measurements; First derivative; ND : YAG lasers; Optical frequency combs; Saturated absorptions; Sum frequency generation; Vibrational transitions, Neodymium lasers, article; computer aided design; computer simulation; equipment; equipment design; infrared radiation; instrumentation; laser; light; radiation scattering; signal processing; theoretical model, Computer Simulation; Computer-Aided Design; Equipment Design; Equipment Failure Analysis; Infrared Rays; Lasers; Light; Models, Theoretical; Scattering, Radiation; Signal Processing, Computer-Assisted
DOI: 10.1364/OE.16.011637

Citations: 44
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