Enhancement of high-order harmonic generation by a two-color field: Influence of propagation effects
Enhancement of high-order harmonic generation by a two-color field: Influence of propagation effects
复制标题
DOI：
10.1103/physreva.74.053412
复制
发表时间：
2006-11
影响因子：
2.9
通讯作者：
K. Schiessl;E. Persson;A. Scrinzi;J. Burgdörfer
中科院分区：
文献类型：
--
作者：
K. Schiessl;E. Persson;A. Scrinzi;J. Burgdörfer
最近计算了单原子对双色激光脉冲的响应，其中较高的频率与靶原子的激发共振，表明光电离和高次谐波产生显著增强[K.石川，Phy. Rev. Lett. 91，043002（2003）]。我们在一个完全量子力学脉冲传播算法的框架内研究了这个问题，并在单活性电子近似下对稀有气体进行了计算。与相应的单色脉冲相比，谐波输出的增强在短的传播长度下保持不变，从而保证了实验实现的可行性。我们还研究了通过双光子跃迁共振的弱第二色，其中也可以观察到谐波产率的显着增强。
Recent calculations of the response of a single atom subjected to a two-color laser pulse with the higher frequency being resonant with an excitation of the target atom revealed a significant enhancement of photoionization as well as high-order harmonic generation [K. Ishikawa, Phy. Rev. Lett. 91, 043002 (2003)]. We investigate the problem in the framework a fully quantum-mechanical pulse propagation algorithm and perform calculations for rare gases in the single-active-electron approximation. The enhancement of harmonic output compared to the corresponding one-color pulse remains intact for short propagation lengths, promising the feasibility of experimental realization. We also study weak second colors resonant via a two-photon transition where significant enhancements in harmonic yields can be observed as well.