Two photon absorption and coherent control with broadband down-converted light

Details Two photon absorption and coherent control with broadband down-converted light Two photon absorption and coherent control with broadband down-converted light

2004-01-15

arxiv.org/abs/quant-ph/0401088v1

Phys. Rev. Lett. 93, 023005 (2004)

Physics

Quantum Physics

5 pages, 3 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.93.023005

We experimentally demonstrate two-photon absorption (TPA) with broadband down-converted light (squeezed vacuum). Although incoherent and exhibiting the statistics of a thermal noise, broadband down-converted light can induce TPA with the same sharp temporal behavior as femtosecond pulses, while exhibiting the high spectral resolution of the narrowband pump laser. Using pulse-shaping methods, we coherently control TPA in Rubidium, demonstrating spectral and temporal resolutions that are 3-5 orders of magnitude below the actual bandwidth and temporal duration of the light itself. Such properties can be exploited in various applications such as spread-spectrum optical communications, tomography and nonlinear microscopy.

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