啁啾超短激光脉冲对稠密共振介质特性的调控

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 semiclassical theory of lightmatter interaction, the Bloch equations with chirped terms were established in a dense twolevel medium, and an accurate and efficient fourthorder RungeKutta method was applied for solving the equations. After numerical simulation, the interactions between a chirped ultrashort pulse and dense resonant twolevel medium were investigated, and the influences of localfield 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 localfield 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.

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