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

• 来源期刊: 中国物理B（英文版）
• 关键词: nano-second laser pico-second laser nonlinear absorption z-scan
• 年，卷（期）: 2019,（2）
• 页码范围: 268-272
• 页数: 5页
• 语种: 英文
• DOI: 10.1088/1674-1056/28/2/024211

摘要

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.