Absolute frequency measurement of molecular transitions by a direct link to a comb generated around 3-microm.
A 3-microm 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-microm coherent radiation to the nearest comb tooth and tuning the comb mode spacing across the Doppler-broadened absorption profile of a CH(4) ro-vibrational transition.
Consiglio Nazionale delle Ricerche - Istituto Nazionale di Ottica Applicata, and European Laboratory for Nonlinear Spectroscopy (LENS), Comprensorio A.Olivetti, Via Campi Flegrei 34, 80078 Pozzuoli, Naples, Italy. pietro.malara@inoa.it
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P
Malara
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P
Maddaloni
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G
Gagliardi
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P
De Natale
D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005374:Filtration / Q000295:instrumentation* / Q000379:methods; D008962:Models, Theoretical; D015336:Molecular Probe Techniques / Q000295:instrumentation*