超短脉冲谐波截止区量子效应研究  

Quantum Effects on the Cutoff Region of Ultra-short Laser Pulse on High-order Harmonic Generation

作　　者：刘烨[1] 季涛[1] 徐红霞[1] 

机构地区：[1]上海工程技术大学基础教学学院,上海201620

出　　处：《量子光学学报》2011年第3期187-192,共6页Journal of Quantum Optics

基　　金：上海高校选拔培养优秀青年教师科研专项基金(gjd08028)

摘　　要：采用Lewenstein路径积分模型和准经典"三步"模型,计算了不同脉宽的超短脉冲高次谐波波谱。通过比较模型截止频率随载波包络相位的变化关系的差异,对辐射过程中的量子效应进行了研究。结果显示,随脉宽的减小,以上两种模型计算结果出现的偏离增加,谐波辐射中的量子效应愈加明显。当脉宽减小至0.5 T(T为光学周期)时,准经典"三步"模型已不能用以解释Lewenstein模型的计算结果。We study the quantum effects on the high-order harmonic generation of ultra-short laser pulse represented by the disagreement, which are calculated by the Lewenstein model and the ＂ three-step＂ model, of the relationship between the cutoff frequencies of the high-order harmonic generation spectrum and the carrier-envelope phases for ultra-short laser pulses with different pulse durations. The results show that with the ultra-short pulse widths decreasing, the quantum effects appears to be more serious. When the pulse width decreases to 0.5 T （T is the optical cycle）, the ＂three-step＂ model has been unable to give reasonable explanation for the Lewenstein model.

关 键 词：超短脉冲 高次谐波产生 截止频率 量子效应 

分 类 号：O431[机械工程—光学工程]