Electromagnetically induced transparency is observed in a mismatched-wavelength cascade system with a room-temperature rubidium vapor cell. A cw probe laser beam monitors the 5<i>S</i><sub>1/2</sub> → 5<i>P</i><sub>3/2</sub> transition while another cw laser couples the 5<i>P</i><sub>3/2</sub> state to a higher excited state. The ratio of the observed Rabi frequencies for coupling to the 5<i>P</i><sub>3/2</sub> → 8<i>D</i><sub>3/2</sub>, <sub>5/2</sub> transitions agrees well with that predicted by use of the transition oscillator strengths. Optical switching is demonstrated with an 80-mW coupling laser beam modulated up to 1 MHz.
© 2001 Optical Society of America
(020.4900) Atomic and molecular physics : Oscillator strengths
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(060.4080) Fiber optics and optical communications : Modulation
(270.1670) Quantum optics : Coherent optical effects
(300.6210) Spectroscopy : Spectroscopy, atomic
Jason Clarke, Hongxin Chen, and William A. van Wijngaarden, "Electromagnetically induced transparency and optical switching in a rubidium cascade system," Appl. Opt. 40, 2047-2051 (2001)