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 5S_(1/2)→5P_(3/2) transition while another cw laser couples the 5P_(3/2) state to a higher excited state. The ratio of the observed Rabi frequencies for coupling to the 5P_(3/2)→8D_(3/2,5/2) 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.
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