Abstract

The operation of an ultra-narrow bandwidth optical filter based on the 5P_3/2 --> 5D_3/2 excited-state transition in rubidium vapor is reported. The 5D_3/2 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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