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Frontiers in Optics

Thermo-Optic Tuning of Whispering Gallery Modes in Microspheres to the 85Rb Cooling Transition in a Vapor Cell

Amy Watkins, Jonathan M. Ward, Síle Nic Chormaic

Published Jan 1, 2010• 0 citations
Publisher

Abstract

We demonstrate a method for tuning whispering gallery modes in microspheres to the cooling transition of 85Rb in vacuum. The ability of this device as a sensitive atom-optic sensing tool is presented for bio-sensing applications.
DOI
10.1364/fio.2010.fthaa5

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We present experimental results on an all-optical, thermally-assisted technique for broad range tuning of microsphere cavity resonance modes to arbitrary probe wavelengths. An erbium:ytterbium co-doped phosphate glass (Schott IOG-2) microsphere is pumped at 978 nm via the supporting stem and the heat generated by absorption of the pump light expands the cavity and changes the refractive index. This is a robust tuning method that decouples the pump from the probe and allows fine tuning of the microsphere's whispering gallery modes. Pump/probe experiments were performed to demonstrate thermo-optical tuning to specific probe wavelengths, including the 5 S 1/2 F= 3 to 5 P 3/2 F'= 4 laser cooling transition of rubidium-85. This is of particular interest for cavity quantum electrodynamics (QED)-type experiments, while the broad tuning range achievable is useful for integrated photonic devices, including sensors and modulators.
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