Phys. Rev. A 83, 033833 (2011) [5 pages]Enhanced two-photon absorption in a hollow-core photonic-band-gap fiberReceived 1 November 2010; published 30 March 2011 We show that two-photon absorption (TPA) in rubidium atoms can be greatly enhanced by the use of a hollow-core photonic-band-gap fiber. We investigate off-resonant, degenerate Doppler-free TPA on the 5S1/2→5D5/2 transition and observe 1% absorption of a pump beam with a total power of only 1 mW in the fiber. These results are verified by measuring the amount of emitted blue fluorescence and are consistent with the theoretical predictions which indicate that transit-time effects play an important role in determining the two-photon absorption cross section in a confined geometry. ©2011 American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.83.033833
DOI:
10.1103/PhysRevA.83.033833
PACS:
42.62.Fi, 42.50.Gy, 42.81.Qb, 42.65.-k
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