The optical properties of matter are the subject of extensive research in modern physics due to their numerous applications in various branches of technology. A particularly interesting field of physics is non-Hermitian photonics, within which the possibility of creating invisible material is theoretically foreseen. To achieve such a state, it is necessary to influence basic physical parameters of the medium through which the light propagates, such as absorption and refractive index. In this thesis, a system for controlling light propagation in hot vapors of rubidium atoms 87Rb, which represents a non-Hermitian dielectric medium, was established. The theoretical background for the description of the spatial change of the refractive index in the material based on the electromagnetically induced transparency in the frequency range far from the atomic transition is presented. Experimental techniques used to create an optically induced lattice on rubidium atoms using a continuous laser are described. Wide frequency ranges were investigated in the vicinity of two transitions of the D2 line where the refractive index changes. In addition, a system for frequency stabilization of the laser using the technique of spectroscopy by transmission of signal modulation was established. This thesis achieved the preconditions for the continuation of experimental research into the possibilities offered by the management of absorption and refractive index in the material.