Scientific Results

Laser-frequency locking to a whispering-gallery-mode cavity by spatial interference of scattered light

Year: 2016

Authors: Zullo R., Giorgini A., Avino S., Malara P., De Natale P., Gagliardi G.

Autors Affiliation: Consiglio Nazionale delle Ricerche, Istituto Nazionale di Ottica (INO), Comprensorio A. Olivetti, Via Campi Flegrei 34, Pozzuoli (Naples), 80078, Italy; Consiglio Nazionale delle Ricerche, Istituto Nazionale di Ottica (INO), Largo E. Fermi 6, Firenze, 50125, Italy

Abstract: We present a simple and effective method for frequency locking a laser source to a free-space-coupled whispering-gallery- mode cavity. The scheme relies on the interference of spatial modes contained in the light scattered by the cavity, where low-and high-order modes are simultaneously excited. A dispersion-shaped signal proportional to the imaginary component of the resonant optical field is simply generated by spatial filtering of the scattered light. Locking of a diode laser to the equatorial modes of a liquid droplet resonator is demonstrated using this scheme, and its performance is compared to the Pound-Drever-Hall technique. This new approach makes laser-frequency locking straightforward and shows a number of advantages, including robustness, low cost, and no need for sophisticated optical and electronic components. (C) 2016 Optical Society of America

Journal/Review: OPTICS LETTERS

Volume: 41 (3)      Pages from: 650  to: 652

More Information: P.O.R.-Campania (“BERSAGLI,” FESR 2007-2013).
KeyWords: Light scattering; Locks (fasteners), Electronic component; Frequency locking; High order mode; Light scattered; Liquid droplets; Pound-Drever-Hall technique; Spatial filterings; Spatial interference; Laser mode locking
DOI: 10.1364/OL.41.000650

Citations: 9
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