Abstract

The operation of an ultra-narrow bandwidth optical filter based on the 5P<sub>3/2</sub> --> 5D<sub>3/2</sub> excited-state transition in rubidium vapor is reported. The 5D<sub>3/2</sub> state is excited by a circularly polarized pump beam at 780 nm from a diode laser. The filter displays a single 398-MHz bandwidth at a peak transmission of 9.0%, which is narrower than the Doppler bandwidth. The dependence of peak transmission on the pump intensity and cell temperature is also given.

© 2007 Chinese Optics Letters

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