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
(020.4180) Atomic and molecular physics : Multiphoton processes
(120.2440) Instrumentation, measurement, and metrology : Filters
(300.2530) Spectroscopy : Fluorescence, laser-induced
(300.6210) Spectroscopy : Spectroscopy, atomic
Zhusong He, Yundong Zhang, Shuangqiang Liu, and Ping Yuan, "Transmission characteristics of an excited-state induced dispersion optical filter of rubidium at 775.9 nm," Chin. Opt. Lett. 5, 252-254 (2007)