Abstract

A Raman-amplified atomic filter is demonstrated experimentally. With a coupling light detuned from the D2 line of Rb85, a weak signal light can be amplified by a factor of 55, and the bandwidth of the filter’s transmission spectrum is narrowed to 60MHz. Moreover, the transmission wavelength is adjustable by changing the coupling-light frequency. Compared with a conventional dispersive atomic filter, this Raman-amplified atomic filter could be more efficient to suppress background noise in free-space quantum-key distribution or a laser-communication system.

© 2008 Optical Society of America

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