Laser-frequency locking to a whispering-gallery-mode cavity by spatial interference of scattered light
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 lockingDOI: 10.1364/OL.41.000650Citations: 9data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2019-09-15References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here