Highly efficient high-harmonic generation in an orthogonally polarized two-color laser field
Highly efficient high-harmonic generation in an orthogonally polarized two-color laser field
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DOI：
10.1103/physrevlett.94.243901
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发表时间：
2005-06-24
影响因子：
8.6
通讯作者：
Nam, CH
中科院分区：
文献类型：
--
作者：
Kim, IJ;Kim, CM;Nam, CH
利用飞秒钛宝石激光器的基频和二次谐波组成的双色激光场，在氦气中实现了高效的高次谐波输出。在施加高强度二次谐波的情况下，正交极化双色场中产生的谐波比基场中产生的谐波强2个数量级以上，甚至比平行偏振情况下的强。在21.6 nm处获得了高达5×10(-5)的38次谐波转换效率。通过分析电子在双色场中的行为，推断了这种增强的物理来源。
Highly efficient high-harmonic generation was achieved in helium using a two-color laser field that consisted of the fundamental and the second harmonic fields of a femtosecond Ti:sapphire laser. By applying a high intensity second harmonic, the harmonics generated in the orthogonally polarized two-color field were stronger than those obtained in the fundamental field by more than 2 orders of magnitude, and even stronger than those of the parallel polarization case. A conversion efficiency as high as 5x10(-5) was obtained for the 38th harmonic at 21.6 nm. The physical origin of this enhancement was deduced by analyzing the electron behavior in the two-color field.