Optical response in six-level 85Rb and 87Rb atomic media

In this work, we analytically investigate the optical response including absorption, dispersion, and group index of a six-level atomic system under electromagnetically induced transparency (EIT). A key advantage of this configuration is its ability to simultaneously generate four transparency windows at distinct frequency regions using only two controlling laser fields. The analytical model is applied to both 87Rb and 85Rb atoms in cold and hot conditions, enabling exploration under various experimental environments. The results provide a comprehensive picture of the fundamental optical properties of 87Rb and 85Rb atomic systems with the six-level configuration, offering useful insights for experimental predictions and potential applications.