Splitting of an electromagnetically induced transparency window of rubidium atoms in a static magnetic field

摘要: We study the phenomenon of electromagnetically induced transparency (EIT) $^{87}\mathrm{Rb}$ vapor at temperature $325\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ in a magnetic field. Two linearly polarized orthogonal laser fields act on two dipole-allowed transitions $D1$ line $\ensuremath{\Lambda}$ configuration, respectively. In absence fields, we observe wide EIT window with contrast about 66% while when field is applied, split into three or four narrower subwindows contrasts 32% 16% due to lifting sublevels' degeneracy. The number depends orientation. Our theoretical simulations and analysis are good agreement experimental results.