Absolute frequency measurement of molecular transitions by a direct link to a comb generated around 3-mu m

Year: 2008

Authors: Malara P., Maddaloni P., Gagliardi G., De Natale P.

Autors Affiliation: CNR – Istituto Nazionale di Ottica Applicata (INOA) and European Laboratory for Non-Linear Spectroscopy (LENS), Comprensorio “A. Olivetti”, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy;
Dipartimento di Scienze Ambientali 2. Università di Napoli, Via Vivaldi 43, 81100 Caserta, Ialy

Abstract: A 3-mu m continuous-wave difference-frequency source is directly referenced to a mid-infrared optical frequency comb synthesizer by measuring their beat-note signal by a fast HgCdTe detector. Absolute frequency metrology of molecular vibration spectra is demonstrated by locking the 3-mu m coherent radiation to the nearest comb tooth and tuning the comb mode spacing across the Doppler-broadened absorption profile of a CH4 ro-vibrational transition. (c) 2008 Optical Society of America.

Journal/Review: OPTICS EXPRESS

Volume: 16 (11)      Pages from: 8242  to: 8249

KeyWords: Doppler effect; Frequency response; Mercury compounds; Vibrational spectra, Frequency comb synthesizer; Molecular vibration spectra; Vibrational transitions, Continuous wave lasers, article; computer aided design; computer simulation; equipment; equipment design; filtration; genetic procedures; instrumentation; methodology; theoretical model, Computer Simulation; Computer-Aided Design; Equipment Design; Equipment Failure Analysis; Filtration; Models, Theoretical; Molecular Probe Techniques
DOI: 10.1364/OE.16.008242

Citations: 49
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