Cavity-enhanced polarization rotation measurements for low-disturbance probing of atoms

Year: 2021

Authors: Mazzinghi C., Orenes D.B., Gomez P., Lucivero V.G., Aybar E., Gugnani S., Mitchell M.W.

Autors Affiliation: Barcelona Inst Sci & Technol, ICFO Inst Ciencies Foton, Castelldefels 08860, Barcelona, Spain; ICREA Inst Catalana Recerca & Estudis Avancats, Barcelona 08010, Spain.

Abstract: We propose and demonstrate cavity-enhanced polarization-rotation measurement as a means to detect magnetic effects in transparent media with greater sensitivity at equal optical disturbance to the medium. Using the Jones calculus, we compute the effective polarization rotation effect in a Fabry-Perot cavity containing a magnetic medium, including losses due to enclosure windows or other sources. The results show that when measuring polarization rotation, collecting the transmitted light has advantages in simplicity and linearity relative to collecting the reflected light. We demonstrate the technique by measuring Faraday rotation in a Rb-87 atomic ensemble in the single-pass and cavity-enhanced geometries, and observe enhancement in good agreement with the theoretical predictions. We also demonstrate shot-noise-limited operation of the enhanced rotation scheme in the small-angle regime. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Journal/Review: OPTICS EXPRESS

Volume: 29 (25)      Pages from: 40854  to: 40864

More Information: H2020 Marie Sklodowska-Curie Actions (754510); Horizon 2020 Framework Programme (17FUN03, 665884, 766402, 820393, 820405); Fundacion Mig-Puig; Fundacion Cellex; Agencia de Gestio d’Ajuts Universitaris i de Recerca (2017-SGR-1354); Departament d’Empresa i Coneixement, Generalitat de Catalunya (001-P-001644); Ministerio de Ciencia, Innovacion y Universidades (CEX2019-000910-S, PCI2018-092973, PGC2018-097056-B-I00).
KeyWords: Quantum-nondemolition Measurement; Spin; Times
DOI: 10.1364/OE.438675

ImpactFactor: 3.833
Citations: 2
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