Observation of Two-Photon Absorption at Low Power Levels Using Tapered Optical Fibers in Rubidium Vapor
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Type of Work4 pages
Citation of Original PublicationS. 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
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.