Microscale whispering-gallery-mode light sources with lattice-confined atoms

Abstract Microlasers, relying on the strong coupling between active particles and optical microcavity, exhibit fundamental differences from conventional lasers, such as multi-threshold/thresholdless behavior and nonclassical photon emission. As light sources, microlasers possess extensive applicatio...

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Autores principales:	Deshui Yu, Frank Vollmer
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/77b58ff2fceb4b4bb24a673be0636d7d
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spelling	oai:doaj.org-article:77b58ff2fceb4b4bb24a673be0636d7d2021-12-02T15:23:17ZMicroscale whispering-gallery-mode light sources with lattice-confined atoms10.1038/s41598-021-93295-52045-2322https://doaj.org/article/77b58ff2fceb4b4bb24a673be0636d7d2021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-93295-5https://doaj.org/toc/2045-2322Abstract Microlasers, relying on the strong coupling between active particles and optical microcavity, exhibit fundamental differences from conventional lasers, such as multi-threshold/thresholdless behavior and nonclassical photon emission. As light sources, microlasers possess extensive applications in precision measurement, quantum information processing, and biochemical sensing. Here we propose a whispering-gallery-mode microlaser scheme, where ultracold alkaline-earth metal atoms, i.e., gain medium, are tightly confined in a two-color evanescent lattice that is in the ring shape and formed around a microsphere. To suppress the influence of the lattice-induced ac Stark shift on the moderately-narrow-linewidth laser transition, the red-detuned trapping beams operate at a magic wavelength while the wavelength of the blue-detuned trapping beam is set close to the other magic wavelength. The tiny mode volume and high quality factor of the microsphere ensure the strong atom-microcavity coupling in the bad-cavity regime. As a result, both saturation photon and critical atom numbers, which characterize the laser performance, are substantially reduced below unity. We explore the lasing action of the coupled system by using the Monte Carlo approach. Our scheme may be potentially generalized to the microlasers based on the forbidden clock transitions, holding the prospect for microscale active optical clocks in precision measurement and frequency metrology.Deshui YuFrank VollmerNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-16 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Deshui Yu Frank Vollmer Microscale whispering-gallery-mode light sources with lattice-confined atoms
description	Abstract Microlasers, relying on the strong coupling between active particles and optical microcavity, exhibit fundamental differences from conventional lasers, such as multi-threshold/thresholdless behavior and nonclassical photon emission. As light sources, microlasers possess extensive applications in precision measurement, quantum information processing, and biochemical sensing. Here we propose a whispering-gallery-mode microlaser scheme, where ultracold alkaline-earth metal atoms, i.e., gain medium, are tightly confined in a two-color evanescent lattice that is in the ring shape and formed around a microsphere. To suppress the influence of the lattice-induced ac Stark shift on the moderately-narrow-linewidth laser transition, the red-detuned trapping beams operate at a magic wavelength while the wavelength of the blue-detuned trapping beam is set close to the other magic wavelength. The tiny mode volume and high quality factor of the microsphere ensure the strong atom-microcavity coupling in the bad-cavity regime. As a result, both saturation photon and critical atom numbers, which characterize the laser performance, are substantially reduced below unity. We explore the lasing action of the coupled system by using the Monte Carlo approach. Our scheme may be potentially generalized to the microlasers based on the forbidden clock transitions, holding the prospect for microscale active optical clocks in precision measurement and frequency metrology.
format	article
author	Deshui Yu Frank Vollmer
author_facet	Deshui Yu Frank Vollmer
author_sort	Deshui Yu
title	Microscale whispering-gallery-mode light sources with lattice-confined atoms
title_short	Microscale whispering-gallery-mode light sources with lattice-confined atoms
title_full	Microscale whispering-gallery-mode light sources with lattice-confined atoms
title_fullStr	Microscale whispering-gallery-mode light sources with lattice-confined atoms
title_full_unstemmed	Microscale whispering-gallery-mode light sources with lattice-confined atoms
title_sort	microscale whispering-gallery-mode light sources with lattice-confined atoms
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/77b58ff2fceb4b4bb24a673be0636d7d
work_keys_str_mv	AT deshuiyu microscalewhisperinggallerymodelightsourceswithlatticeconfinedatoms AT frankvollmer microscalewhisperinggallerymodelightsourceswithlatticeconfinedatoms
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Microscale whispering-gallery-mode light sources with lattice-confined atoms

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