High-coherence mid-infrared frequency comb

Year: 2013

Authors: Galli I., Cappelli F., Cancio P., Giusfredi G., Mazzotti D., Bartalini S., De Natale P.

Autors Affiliation: CNR-INO – Istituto Nazionale di Ottica, Largo Enrico Fermi 6, 50125 Firenze FI, Italy and LENS – European Laboratory for Non-Linear Spectroscopy, Via Nello Carrara 1, 50019 Sesto Fiorentino FI, Italy

Abstract: We report on the generation of a frequency comb around 4330 nm with an unprecedented coherence of the single teeth. Generating the comb within a Ti:sapphire laser cavity by a difference-frequency process and using a phase-lock scheme based on direct digital synthesis, we achieve a tooth linewidth of 2.0 kHz in a 1-s timescale (750 Hz in 20 ms). The generated per-tooth power of 1 mu W ranks this comb among the best ever realized in the mid-infrared in terms of power spectral density. (C) 2013 Optical Society of America

Journal/Review: OPTICS EXPRESS

Volume: 21 (23)      Pages from: 28877  to: 28885

More Information: This work was financially supported by Ente Cassa di Risparmio di Firenze, by the Laserlab-Europe Consortium within the ALADIN project framework, by the Extreme Light Infrastructure (ELI) European project and by the Progetto Operativo Nazionale (PON) PON01_01525 Monitoraggio Innovativo per le Coste e l\’Ambiente Marino (MONICA) funded by the Italian Ministry of Education, University and Research (MIUR).
KeyWords: Direct digital control systems; Laser mode locking; Power spectral density, Difference frequency; Direct digital synthesis; Frequency combs; Mid-infrared frequency combs; Midinfrared; Single tooth; Ti: Sapphire laser; Time-scales, Infrared devices; Quantum-cascade laser; Mode-locked laser; MU-M
DOI: 10.1364/OE.21.028877

Citations: 44
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