光子学报, 2013, 42 (5): 531, 网络出版: 2013-05-22
啁啾超短激光脉冲对稠密共振介质特性的调控
Modulation of Chirped Ultrashort Pulse in Dense and Resonant Medium
啁啾超短激光脉冲 稠密共振介质 光学Bloch方程 局域场效应 Chirped ultrashort pulse Dense and resonant medium Optical Bloch equations Localfield effects
摘要
采用光与物质相互作用的半经典理论,建立了稠密二能级体系中含啁啾相位项的光学Bloch方程,并用高准确度、快速和可靠的四阶龙格库塔法数值求解了该方程.通过数值计算,研究了啁啾超短激光脉冲与稠密共振二能级体系作用下的特性,得到了局域场和啁啾参量对Bloch矢量影响的规律.研究结果表明:局域场修正系数和啁啾参量对Bloch矢量的瞬态相干过程和稳态特性都会产生明显的调制作用,可以通过调节线性啁啾参量和局域场修正系数实现稳定的粒子数布居反转的调控.
Abstract
According to the semiclassical theory of lightmatter interaction, the Bloch equations with chirped terms were established in a dense twolevel medium, and an accurate and efficient fourthorder RungeKutta method was applied for solving the equations. After numerical simulation, the interactions between a chirped ultrashort pulse and dense resonant twolevel medium were investigated, and the influences of localfield effects and chirp on Bloch vectors were gained. The numerical results show that, the evolutions of Bloch vectors and the final state of inversion are strongly modulated by the localfield effects correction coefficient and chirp parameter, which provides a method to achieve stable population inversion of control by adjusting the linear chirp parameter and local field correction coefficient.
李斌, 余向阳, 陈国杰, 陈伟成. 啁啾超短激光脉冲对稠密共振介质特性的调控[J]. 光子学报, 2013, 42(5): 531. LI Bin, YU Xiangyang, CHEN Guojie, CHEN Weicheng. Modulation of Chirped Ultrashort Pulse in Dense and Resonant Medium[J]. ACTA PHOTONICA SINICA, 2013, 42(5): 531.