Abstract
The results on experimental observation of electromagnetically induced transparency (EIT) in four-level N-type scheme are presented [1] The experiments were performed on the D2 absorption line of 87Rb 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 5S1/2(F=2)→5P3/2(F=1,2,3) The absorption of emission of the laser 1 was measured The frequency of the second laser (laser 2) was scanned across the Doppler broadened transition 5S1/2(F=1)→5P3/2(F=0,l,2) In this conditions we observed a conventional single EIT resonance (Fig 1a) in the two photon Raman-type schemes 5s1/2(f=2)↔ 5P3/2(F=l)↔ 5S1/2(F=2) and 5S1/2(F=l)↔5P3/2(F=2)↔ 5s1/2(f=2) for two velocity groups of atoms
© 2000 IEEE
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