Observation of Two-Photon Absorption at Low Power Levels Using Tapered Optical Fibers in Rubidium Vapor

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S. M. Hendrickson, M. M. Lai, T. B. Pittman, and J. D. Franson, Observation of Two-Photon Absorption at Low Power Levels Using Tapered Optical Fibers in Rubidium Vapor, Phys. Rev. Lett. 105, 173602 (2010), DOI:https://doi.org/10.1103/PhysRevLett.105.173602

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©2010 The American Physical Society

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Abstract

Nonlinear optical effects can be enhanced in tapered optical fibers with diameters less than the wavelength of the propagating light. Here we report on the observation of two-photon absorption using tapered fibers in rubidium vapor at power levels of less than 150 nW. Transit-time broadening produces two-photon absorption spectra with sharp peaks that are very different from conventional line shapes.