中国激光, 2010, 37 (5): 1213, 网络出版: 2010-05-11
利用中红外激光产生单个阿秒脉冲的理论研究
Theoretical Study on Single Attosecond Pulse Generated by Midinfrared Intense Laser Pulse
非线性光学 中红外激光 分裂算符 高次谐波 阿秒脉冲 nonlinear optics midinfrared laser fields split-operator high-order harmonic attosecond pulse
摘要
采用中红外(MIR)激光和紫外(UV)场所构成的组合场作为产生阿秒脉冲的驱动光源,利用分裂算符方法求解了一维模型氦原子在强激光场中的含时薛定谔方程,获得了由波长为1400 nm和78 nm形成的组合场驱动氦原子产生的高次谐波谱和阿秒脉冲,并通过调节组合场中两束激光的时间延迟,提高一个电子轨道对谐波的贡献,而抑制另一个电子轨道的贡献,得到的单个阿秒脉冲比红外场和紫外场作为驱动源产生的脉冲更短。
Abstract
We investigate the generation of isolated broadband attosecond pulses for a model of He atom driven by a midinfrared (MIR) laser pulse in combination with a ultraviolet (UV) controlling pulse. By solving the time-dependent Schrdinger equation with split-operator method,the high-order harmonic and attosecond pulse are obtained with MIR and UV pulses,whose wavelengths are 1400 nm and 78 nm respectively. By adjusting the time delay of two lasers,we can enhance the contribution of one electron trajectory and suppress the other electron trajectory. Thus we obtain a shorter isolated attosecond pulse,compared with the pulse produced by the He atom driven by the infrared and ultraviolet fields.
杜小杰, 周效信, 李鹏程. 利用中红外激光产生单个阿秒脉冲的理论研究[J]. 中国激光, 2010, 37(5): 1213. Du Xiaojie, Zhou Xiaoxin, Li Pengcheng. Theoretical Study on Single Attosecond Pulse Generated by Midinfrared Intense Laser Pulse[J]. Chinese Journal of Lasers, 2010, 37(5): 1213.