Transformation of light pulse shape by thin plane-parallel layer of absorbing material

Н. И. Инсарова, G. I. Olefir

S Yu Nechaev, Yu. N. Ponomarev

Md. Aminul Islam Talukder, Makoto Tomita

Emad Hubainy

V. A. Yurevich

A numerical analysis is used to formulate the conditions for the manifestation of bistable reflection of a quasimonochromatic light pulse from a thin layer of a resonant medium with nonlinear refraction. The duration of the light pulse is assumed to be less than the phase relaxation time of the nonlinear material. The nonlinearity is due to the existence, in the energy structure of the active atoms, of transitions adjacent to resonances.

James D. Macomber

As a high-intensity monochromatic light pulse passes through a material containing two-level systems, saturable absorption or amplification of the radiation may occur. The resultant ``shaping'' of the intensity-vs-time curve as a function of distance into the sample is the subject of this paper. A theory is developed based on the Einstein rate equations, and pulse-shape functions are derived which depend on the absorption and loss coefficients of the material, the relaxation time of the systems, the input-pulse intensity and width, the initial ``state-of-pump'', and number density of absorbers in the sample.