Zheng Yinghui, Zeng Zhinan, Zou Pu, Zhang Li, Li Xiaofang, Liu Peng, Li Ruxin, Xu Zhizhan
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China.
Phys Rev Lett. 2009 Jul 24;103(4):043904. doi: 10.1103/PhysRevLett.103.043904. Epub 2009 Jul 23.
We propose a scheme to compensate dynamically the intrinsic chirp of the attosecond harmonic pulses. By adding a weak second harmonic laser field to the driving laser field, the chirp compensation can be varied from the negative to the positive continuously by simply adjusting the relative time delay between the two-color pulses. Using this technique, the compensation of the negative chirp in harmonic emission is demonstrated experimentally for the first time and the nearly transform-limited attosecond pulse trains are obtained.
我们提出了一种动态补偿阿秒谐波脉冲固有啁啾的方案。通过在驱动激光场中加入一个弱的二次谐波激光场，只需简单地调整双色脉冲之间的相对时间延迟，就可以使啁啾补偿从负向正连续变化。利用该技术，首次通过实验证明了对谐波发射中负啁啾的补偿，并获得了近乎变换极限的阿秒脉冲序列。
