Abstract
We demonstrate a tunable narrowband filter based on optical-pumping-induced circular dichroism in rubidium vapor. The filter achieves a peak transmission of 14.6%, a linewidth of , and an out-of-band extinction of . The transmission peak can be tuned within the range of the Doppler linewidth of the line of atomic rubidium at . While other atomic filters work at frequencies far from absorption, the presented technique provides light resonant with atomic media, useful for atom–photon interaction experiments. The technique could readily be extended to other alkali atoms.
© 2009 Optical Society of America
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