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arXiv 0809.2191physics.optics
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利用啁啾laser和静态电场相结合的方法控制高次谐波截止

Control the high-order harmonics cutoff through the combination of chirped laser and static electric field

Yang Xiang, Yueping Niu, Shangqing Gong

摘要:

从理论上研究了啁啾激光脉冲与静电场作用下原子的高次谐波产生。首次在三步模型的基础上进一步探讨了高次谐波截止时间显著延长的物理机制。结果表明,由于组合场的不对称性,截止时间大大延长。如果选择合适的参数,高次谐波截止可达Ip+42Up。此外,可以产生超宽的超连续谱。当相位得到适当补偿时,可以获得孤立的9阿秒脉冲。

英文摘要:

The high harmonic generation from atoms in the combination of chirped laser pulse and static field is theoretically investigated. For the first time, we explore a further physical mechanism of the significant extension of high harmonic generation cutoff based on three-step model. It is shown that the cutoff is substantially extended due to the asymmetry of the combined field. If appropriate parameters are chosen, the cutoff of high harmonic generation can reach Ip+42Up. Furthermore, an ultrabroad super-continuum spectrum can be generated. When the phases are properly compensated for, an isolated 9 attosecond pulse can be obtained.

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