Modeling and measuring the quality factor of whispering gallery mode resonators

Year: 2018

Authors: Savchenkov A.A., Borri S., Siciliani de Cumis M., Matsko A.B., De Natale P., Maleki L.

Autors Affiliation: OEwaves Inc, 465 Halstead St,Suite 140, Pasadena, CA 91107 USA; INO, CNR, Largo E Fermi 6, I-50125 Florence, FI, Italy; Ist Nazl Fis Nucl, Sez Firenze, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy; ASI, I-75100 Matera, MT, Italy.

Abstract: In this paper, we study an experimental method of evaluation of efficiency of an evanescent field coupling of light to a dielectric whispering gallery mode resonator. We show that change of the relative contrast of the observable optical resonance provides an accurate and complete information about the loaded as well as unloaded bandwidth of the resonator mode. We introduce a model of the coupling that allows for an interpolation of the resonator quality factor using experimental data taken without usage of a frequency tunable narrow line laser, a fast photodiode, as well as a frequency reference. The method is also immune to imperfect geometrical mode matching frequently occurring in a realistic system. We validate this model experimentally at both 1.5 and 4.5 mu M.

Journal/Review: APPLIED PHYSICS B-LASERS AND OPTICS

Volume: 124 (9)      Pages from: 171-1  to: 171-7

More Information: The authors acknowledge financial support from Extreme Light Infrastructure (ELI) European project, from INFN under the SUPREMO project, from Ente Cassa di Risparmio di Firenze under the COSMO project.
KeyWords: Bandwidth; Evanescent fields; Optical resonators; Quantum optics, Complete information; Evanescent-field coupling; Experimental methods; Frequency reference; Optical resonance; Realistic systems; Resonator quality; Whispering gallery mode resonator, Whispering gallery modes
DOI: 10.1007/s00340-018-7033-7

Citations: 15
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