Electromagnetically induced transparency using a vapor cell and a laser-cooled sample of cesium atoms

Electromagnetically induced transparency (EIT) was observed in a mismatched-wavelength cascade system using a room temperature vapor cell and laser-cooled atoms. A cw probe laser beam monitored the cesium 6S1/2→6P3/2 transition while another cw laser coupled the 6P3/2 state to a higher excited state. The ratio of the observed Rabi frequencies for coupling to the 6P3/2→(11--13)D3/2,5/2 transitions agreed closely with that predicted using the transition oscillator strengths. A comparison of the EIT signals obtained using cold atoms and the vapor cell is made.