Autler-Townes splitting via frequency upconversion at ultra-low power levels in cold ${}^{87}$Rb atoms using an optical nanofiber

Abstract

The tight confinement of the evanescent light field around the waist of an optical nanofiber makes it a suitable tool for studying nonlinear optics in atomic media. Here, we use an optical nanofiber embedded in a cloud of laser-cooled 87Rb for near-infrared frequency upconversion via a resonant two-photon process. Sub-nW powers of the two-photon beams, at 780 nm and 776 nm, co-propagate through the optical nanofiber and generation of 420 nm photons is observed. A measurement of the Autler-Townes splitting provides a direct measurement of the Rabi frequency of the 780 nm transition. Through this method, dephasings of the system can be studied. In this work, the optical nanofiber is used as an excitation and detection tool simultaneously, and it highlights some of the advantages of using fully fibered systems for nonlinear optics with atoms.

References in corpus (4)

• Cold Atom Physics Using Ultra-Thin Optical Fibers: Light-Induced Dipole Forces and Surface Interactions
• Observation of two-photon absorption at low power levels using tapered optical fibers in rubidium vapor
• Generation and detection of a sub-Poissonian atom number distribution in a one-dimensional optical lattice
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• Ladder-type electromagnetically induced transparency using nanofiber-guided light in a warm atomic vapor
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• Spin selection rule for {\it S} level transitions in atomic rubidium under paraxial and nonparaxial two-photon excitation
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• Light-induced, fictitious magnetic trapping of cold alkali atoms using an optical tweezers-nanofiber hybrid platform
• Observation of effects of inter-atomic interaction on Autler-Townes splitting in cold Rydberg atoms
• Observation of oscillatory Raman gain associated with two-photon Rabi oscillations of nanofiber-coupled atoms