Observation of electromagnetically induced absorption in ⁸⁷Rb D₂ line in strong transverse magnetic field

We have studied electromagnetically induced absorption in the rubidium-87 D₂ line using pump−probe spectroscopy. The experiment was done in the presence of an external transverse magnetic field with low pump intensity. Two cases viz. pump beam polarization parallel and perpendicular with respect to the orientation of the applied magnetic field were investigated (probe beam polarization was perpendicular to probe beam). We observed two well-resolved N-type systems for pump beam polarization parallel to the external magnetic field. For perpendicular orientation, N-type systems became superimposed, and well-resolved N-type systems were not obtained. The observations made have been explained by the effect of optical pumping. The calculated spectra were found to be in good agreement with experimental observation. The Lande-g factor of the ground state and the excited state have been experimentally evaluated and found to be in good agreement with theoretical values up to 43 G. (paper)