Nonlinear behavior of the population dynamics of three-level systems in the presence of single photon absorption

Abstract

We numerically investigate the population dynamics in a single photon resonant three-level cascade and non-cascade energy level molecules at 532-nm wavelength. The time-dependent population in the energy levels in the presence of 100 ps (pico-second) and 100 ns (nano-second) laser pulses is described in the form of rate equations. We provide a brief idea of how the optical energy transfer takes place in the light-matter interaction and we also discuss the absorption as a function of pulse width and repetition rate. We also plot the z-scan transmittance curve as a function of number of excitation pulses participating in the absorption.

Analysis of multi-photon absorption: z-scan using ultra-short Gaussian vortex beam

“…In nonlinear light-matter interaction, nonlinear absorption has played a pivotal role in the applications of nonlinear optics since its advent [1][2][3]. Owing to the advent of new nonlinear materials, the prominent applications of the nonlinear absorp tion property of condensed matter are saturable absorption [4][5][6], optical limiting [7][8][9] and nonlinear absorption spectr oscopy [10][11][12]. The last few decades have seen a resurgence of interest in nonlinear absorption due to their wide range of applications in the material world [13,14].…”