Experimental observation of electromagnetically induced transparency in a four-level N-type scheme in /sup 87/Rb

Summary form only given. The results on experimental observation of electromagnetically induced transparency (EIT) in a four-level N-type scheme are presented. The experiments were performed on the D/sub 2/ absorption line of /sup 87/Rb. An experimental setup was based on two independent external cavity diode lasers (ECDL). The copropagating orthogonally polarized laser beams were passed through a rubidium cell. The frequency of one of the lasers (laser 1) was fixed and tuned to the center of the Doppler broadened group of transitions 5S/sub 1/2/(F=2)/spl rarr/5P/sub 3/2/(F=1,2,3).