Lee D G, Kim J H, Hong K H, Nam C H
Department of Physics and Coherent X-ray Research Center, Korea Advanced Institute of Science and Technology, Taejon 305-701, Korea.
Phys Rev Lett. 2001 Dec 10;87(24):243902. doi: 10.1103/PhysRevLett.87.243902.
High-order harmonics were coherently controlled using chirped femtosecond laser pulses for the production of sharp and strong harmonics. As the laser intensity was increased above the saturation intensity for optical-field ionization, the laser chirp needed to suppress harmonic chirp in the plateau region changed from positive to negative. We showed that the modification of a laser chirp condition in a rapidly ionizing medium should be included for the proper coherent control of high-order harmonics, necessitating the integral treatment of the interaction between atoms and a driving laser pulse.
利用啁啾飞秒激光脉冲对高次谐波进行相干控制，以产生尖锐且强烈的谐波。当激光强度增加到高于光场电离的饱和强度时，在平台区抑制谐波啁啾所需的激光啁啾从正变为负。我们表明，为了对高次谐波进行适当的相干控制，应考虑在快速电离介质中激光啁啾条件的改变，这需要对原子与驱动激光脉冲之间的相互作用进行整体处理。
