Abstract:
The level splitting appearing upon cascade excitation of the 5D5/2 and 5D3/2 levels of the 87Rb atom in a magnetooptical trap is studied experimentally. The 5S5/2 and 5P3/2 levels are coupled by a cooling laser field, the Rabi frequency being comparable with the rate of spontaneous decay of the 5P3/2 level. The experimental spectral profiles are compared with a theoretical model.