Controls for the generation of high-order harmonics and attosecond pulses by an infrared laser field combined with a low-frequency pulse

We investigate high-order harmonic generations by controlling various quantum paths of harmonics in an infrared laser field which combines a low-frequency pulse. Both classical theory and the quantum wavelet transform method are used to understand the physics of harmonics. By adjusting the carrier envelope phase of the fundamental field, the intensities of harmonic spectra increase and the harmonics in the plateau become regular. Attosecond pulses each with a duration of 58 as are obtained directly by compressing the harmonics, and with phase compensation an isolated attosecond pulse less than 30 as can be generated.

并行计算在阿秒动力学领域的应用

当激光场强度很强时,其作用的时间尺度可以达到亚飞秒(也就是阿秒级别,使得无论的实验上还是理论上都能够真实的观测到电子的运动。强激光场作用于原子或分子体系,产生了许多超快动力学现象,这些现象都属于非微扰理论范畴,需要对其在现有的超级计算条件下用精确的数值方法求解含时薛定谔方程。现有的方法计算比较耗时,我们开发了一套处理这类情况的量子波包程序LZH-DICP,对原有的方法进行了优化,运用OpenMP并行工具处理所有矩阵的相关操作,大大节约了CPU时间。