摘要
数值研究了氦原子在两束同色圆偏激光场下发射高次谐波以及阿秒脉冲的特点.计算结果表明,当适当调节两束激光场的波长,相位以及时间延迟时,不仅高次谐波谱的平台区域能得到很大的扩展,而且谐波的强度也有较大的增强,形成了一个500 e V的超长平台区.最后,通过适当的叠加谐波平台上的谐波,可获得一系列脉宽为35 as左右的水窗区间阿秒脉冲.
We theoretically investigated the generation of the high -order harmonic and the isolated attosecond pulse when a model He atom was exposed to the single -color two circularly polarized pulses .The results showed that by properly choosing the wavelength , the carrier envelope phase （ CEP） and the delay time of the two laser pulses , not only the harmonic cutoff energy is remarkably enhanced , but also the harmonic yield is enhanced , resulting in a supercontinuum with the bandwidth of 500 eV.Finally, by superposing a properly selected harmon-ics in the supercontinuum region , a series of sub-35 as pulses in the water window region can be obtained .
出处
《原子与分子物理学报》
CAS
CSCD
北大核心
2016年第4期675-680,共6页
Journal of Atomic and Molecular Physics
基金
国家自然科学基金资助的课题(11504151)
辽宁省博士启动基金资助的课题(201501123)
辽宁工业大学教师科研启动基金资助的课题(X201312
X201319)
辽宁省教育厅基金资助的课题(L2014242)
关键词
高次谐波
阿秒脉冲
圆偏振激光场
High-order harmonic generation
Attosecond pulse
Circularly polarized pulse
