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Cavity-ringdown-spectroscopy-based study of high Q resonators in add-drop configuration
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Paper Abstract

An optical resonator like a fiber ring (FR) or a whispering gallery mode (WGM) resonator with two couplers along its loop is referred to be in the add-drop configuration, in analogy with the add-drop multiplexer in telecom networks. Both for practical applications as well as in several fundamental studies involving high-Q resonators, this configuration is of great interest and the assessment of the intrinsic properties of the resonator and of its interaction with the coupling systems is extremely important. We developed an original method able to fully characterize high-Q resonators in an add-drop configuration. The method is based on the study of the two cavity ringdown (CRD) signals, which are produced at the transmission and drop ports by wavelength sweeping a resonance in a time interval comparable with the photon cavity lifetime. All the resonator parameters can be assessed with a single set of simultaneous measurements. We implemented the model describing the two CRD profiles from which a best fit process of the measured profiles allows deducing the key parameters. We successfully validated the model with an experiment based on a FR resonator of known characteristics. Finally, we fully characterized a high-Q, home-made, MgF2 WGM disk resonator in the add-drop configuration, assessing its intrinsic and coupling parameters.

Paper Details

Date Published: 13 March 2019
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Proc. SPIE 10904, Laser Resonators, Microresonators, and Beam Control XXI, 1090416 (13 March 2019); doi: 10.1117/12.2509997
Show Author Affiliations
Gabriele Frigenti, Istituto di Fisica Applicata "Nello Carrara" (Italy)
Univ. degli Studi di Firenze (Italy)
Mojtaba Arjmand, Malek-Ashtar Univ. of Technology (Iran, Islamic Republic of)
Andrea Barucci, Istituto di Fisica Applicata "Nello Carrara" (Italy)
Francesco Baldini, Istituto di Fisica Applicata "Nello Carrara" (Italy)
Simone Berneschi, Istituto di Fisica Applicata "Nello Carrara" (Italy)
Daniele Farnesi, Istituto di Fisica Applicata "Nello Carrara" (Italy)
Giancarlo C. Righini, Museo Storico della Fisica e Ctr. Studi e Ricerche "Enrico Fermi" (Italy)
Stefano Pelli, Istituto di Fisica Applicata "Nello Carrara" (Italy)
Silvia Soria, Istituto di Fisica Applicata "Nello Carrara" (Italy)
Ayda Aray, Malek Ashtar Univ. of Technology (Iran, Islamic Republic of)
Yannick Dumeige, Univ. de Rennes (France)
Patrice Féron, Univ. de Rennes (France)
Gualtiero Nunzi Conti, Istituto di Fisica Applicata "Nello Carrara" (Italy)
Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi” (Italy)


Published in SPIE Proceedings Vol. 10904:
Laser Resonators, Microresonators, and Beam Control XXI
Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko, Editor(s)

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