Comparison of optical properties between ladder and lambda-type EIT medium with Er~(3+) ion concentration in Er~(3+):YAG crystal

摘要

The effect of Er~(3+) doped ion concentration on optical properties of two type three-level schemes in 35 nm Er~(3+):YAG (yttrium aluminum garnet) crystal is studied. It is found that intensity threshold of optical bistability and multistability can be changed by Er~(3+) doped ion concentration. Moreover, switching from optical multistability to optical bistability can be done differently by Er~(3+) concentration in two types of three-level schemes. The steady-state and transient behaviors of absorption, dispersion and group index of weak probe field in two schemes are also discussed. In this study, we will report an initial study on optical properties in Er~(3+):YAG crystal and propose a basis for selecting the suitable concentration to carry out experimental investigations in the future.