Dynamic generation and manipulation of multi-color coherent hole-burnings

Coherent hole-burning effect in four-level N-style atoms vapors with level transitions was discussed. The absorption spectrum was in detail studied through density operator motion equations, Laplace transformation and quantum regression theorem. In the model two coupling light and one saturated light were adopted to interact. The features of the optical hole-burning were investigated via various adjusting parameters in two optical routing:one was that the two coupling lights co-propagated with the probe light but the saturated light was opposite, and another was that they all propagated on the same direction. And the calculation results were analyzed with the dressed states theory. At most six coherent hole-burning could be simultaneously observed. The depth of the coherent hole-burning could be changed by adjusting the reference parameters and the Rabi frequency of the saturated laser. The positions of the coherent hole-burning could be changed by modulating the Rabi frequency of the probe light. The understanding of the coherent hole-burning was deepened by these reslut.