The resonances of coherent population trapping (CPT) excited by a frequency-modulated (FM) field at the Zeeman sublevels during the transition $F_g=2\rightarrow F_e=1$ $D_1$ of the $^{87}$Rb $D_1$-absorption line were studied theoretically. The influence of the nonlinear Zeeman effect on the structure of the observed resonances was considered. The spectra of CPT resonances were calculated for different values of magnetic field induction and compared with the experimental data.
32.70.Jz Line shapes, widths, and shifts
42.50.Gy Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption
32.10.Dk Electric and magnetic moments, polarizabilities
$^1$Faculty of Physics, M.V. Lomonosov Moscow State University, Moscow, 119991, Russia
$^2$International Laser Center, M.V. Lomonosov Moscow State University, Moscow, 119991, Russia
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