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Phys Rev Lett. 2010 Oct 22;105(17):173602. Epub 2010 Oct 19.

Observation of two-photon absorption at low power levels using tapered optical fibers in rubidium vapor.

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  • 1Physics Department, University of Maryland, Baltimore County, Baltimore, 21250, USA.


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.

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