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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Ultralow power nonlinear optics in Rb-filled band-gap fibers

Alexander L. Gaeta

Published Jun 1, 2009• 0 citations
Publisher

Abstract

This paper describes recent results on the ultralow nonlinear interactions of Rb atoms in hollow-core photonic- bandgap fibers and show that large optical densities can be generated at room temperature through the process of light-induced atomic desorption.
DOI
10.1109/cleoe-eqec.2009.5196578

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We demonstrate the ability to generate extremely large rubidium densities in uncoated hollow-core photonic band-gap fibers using light-induced atomic desorption. Once the fiber is exposed to Rb vapor for 1-2 weeks, and this atomic source is removed, the fiber yields large desorbable densities for an extended period of time. We show that optical depths greater than e(-1200) can be created within seconds. Our observed Rb densities are several orders of magnitude larger than any previously reported to be generated optically, and allow for the demonstration of a relatively easy-to-use fiber-based vapor cell capable of producing large optical depths without the need for thermal tuning.
We investigate the time dynamics of light-induced desorption of Rb atoms in hollow-core photonic-band-gap fibers and demonstrate all-optical generation of precisely controlled Rb-vapor densities. We also compare the performance of the desorption process in an unmodified fiber with one with an organosilane-coated core, and based on the vapor depletion and recovery behavior, we propose a mechanism to describe the desorption processes. We further demonstrate that high densities of Rb vapor can be generated after the desorption beam is switched off and use it to realize $\ensuremath{\Lambda}$-scheme electromagnetically induced transparency at control powers as low as 80 nW.