【摘要】 采用光与物质相互作用的半经典理论方案,建立了含啁啾相位项的修正光学Bloch方程,并采用高精度的、快速和可靠的、修正的四阶龙格-库塔法数值求解了该方程。通过数值计算,研究了强啁啾超短激光脉冲与二能级体系的相互作用。研究结果表明,啁啾量、入射脉冲面积、脉冲宽度、失谐量都对粒子布居产生明显的调制作用,论文还研究了激光脉冲各参数对粒子布居的调控规律,由此可以通过调节强啁啾超短激光脉冲的各参数来实现对粒子布居的调控。更多还原

【Abstract】 The modified Bloch equations with chirped terms are established through the semi-classical theory of light-matter interaction. In addition, the above equations are solved by an accurate, efficient and modified fourth-order Runge-Kutta method. We investigate the interactions between a strong chirped ultra-short pulse and a two-level system numerically. The results show that the chirp parameter, incident pulse area, pulse length and detuning have obviously modulatory effect on the population. Furthermore, how the laser pulse parameters affect the population is also studied, which helps us how to manipulate the population by adjusting the strong chirped ultra-short laser pulse parameters.更多还原