EFFECTS OF LASER LINEWIDTH, RABI FREQUENCY AND DETUNINGS ON ELECTROMAGNETICALLY INDUCED TRANSPARENCY IN RB ATOMS

We report the effects of laser linewidth, Rabi frequency and detuning on electromagnetically induced transparency in Doppler broadened rubid ium atoms. With a weak probe laser and a strong coupling laser arrange d in a Doppler-cancellation configuration, Doppler-free absorption red uction was observed. By narrowing linewidths of the two lasers, the ab sorption reduction increased up to 78% and the spectral linewidth of t he transmitted probe beam approached a Rb natural linewidth. Laser lin ewidth effects on the obtained transmission were compared with a theor etical analysis based on a three-level atomic model. Also, we report o n a new structure obtained when the coupling beam is slightly detuned.