Eur. Phys. J. D (2016) 70: 184
https://doi.org/10.1140/epjd/e2016-70038-4

Regular Article

Interaction between the ultrashort pulse and two-level medium beyond the rotating wave approximation

State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou 510275, P.R. China

^a e-mail: cesyxy@mail.sysu.edu.cn

Received: 20 January 2016
Received in final form: 30 March 2016
Published online: 6 September 2016

Abstract

Based on the semiclassical theory of light-matter interactions, the optical Bloch equations describing the interaction between light and two-level medium without the rotating wave approximation are established. By solving this equation set, the rule of the interaction between the ultrashort pulse and two-level medium is investigated. We analyze its physical properties and clarify the applicable condition of the rotating wave approximation in a quantitative way. These results reveal the physical mechanism of the interaction between the ultrashort pulse and two-level medium.