Investigation of Electromagnetic Field Propagation in Reverse Saturable Absorbers

摘要

We have developed and implemented a numerical technique for the propagation of the electromagnetic field in a five-level reverse saturable absorber medium, which includes the nonlinear Kerr effect and dispersion. The numerical method combines a split step beam propagation method with the Crank- Nicholson method. Our numerical results and calculations enable the prediction of nonlinear absorption using experimentally measurable material parameters such as the absorption cross-sections and decay rates. We also investigated the interplay between the optical pulse properties such as the temporal pulse width, spatial radius, incident energy and the carrier dynamics, and nonlinear absorption of the reverse saturable absorber.