Resonance measurements techniques of optical whispering gallery mode mini-disc resonators for microwave photonics applications

Patrice Salzenstein; Michal Jelínek; Yanne K. Chembo; Maxim Pogurmiskiy; Hervé Tavernier; Kirill Volyanskiy; Kien Phan Huy; Mathieu Chauvet; Laurent Larger; Václav Kubecek

doi:10.1117/12.886380

18 May 2011 Resonance measurements techniques of optical whispering gallery mode mini-disc resonators for microwave photonics applications

Patrice Salzenstein, Michal Jelínek, Yanne K. Chembo, Maxim Pogurmiskiy, Hervé Tavernier, Kirill Volyanskiy, Kien Phan Huy, Mathieu Chauvet, Laurent Larger, Václav Kubecek

Author Affiliations +

Proceedings Volume 8071, Nonlinear Optics and Applications V; 807104 (2011) https://doi.org/10.1117/12.886380
Event: SPIE Optics + Optoelectronics, 2011, Prague, Czech Republic

Abstract

The aim of this work is to compare advantages and disadvantages of different techniques for coupling a mini-discoptical- resonator to determine quality factor of its resonance. Optical fiber coupled to a resonator consists in a mini disc with whispering gallery modes at its circumference. We choose to work with three materials and design compact miniresonators. Fused silica is found to be suitable for these applications thanks to its hardness in the range 6-7 and the behavior to mechanical shocks, despite its sensitivity to water pollution. With its tetragonal crystal and a good behavior with risk of water pollution, Calcium fluoride is a good candidate despite sensitivity to mechanical shocks. Magnesium fluoride is the third material used. As a critical step, taper coupling is set with a 20nm resolution positioning system. Miniresonator is excited from a system equipped with a tunable laser diode with a tunability from 1490 to 1640 nm and a linewidth narrower than 300kHz. Light is coupled into the microsphere either from glass or fiber prism or with fiber taper via evanescent field. We have also used a single frequency 660nm laser diode with a linewidth narrower than 100kHz which can be tuned about 10pm to test a single resonant peak. Both sources are used with either a tapered fiber or a filed fiber. Resonance is observed and quality factor of the resonators is found to be in the range of 10⁸.

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Patrice Salzenstein, Michal Jelínek, Yanne K. Chembo, Maxim Pogurmiskiy, Hervé Tavernier, Kirill Volyanskiy, Kien Phan Huy, Mathieu Chauvet, Laurent Larger, and Václav Kubecek "Resonance measurements techniques of optical whispering gallery mode mini-disc resonators for microwave photonics applications", Proc. SPIE 8071, Nonlinear Optics and Applications V, 807104 (18 May 2011); https://doi.org/10.1117/12.886380

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KEYWORDS

Resonators

Silica

Semiconductor lasers

Diodes

Fiber couplers

Optical fibers

Magnesium fluoride

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