两种方法产生孤立阿秒脉冲的理论研究

Journal of Atomic and Molecular Sciences Pub Date : 2016-02-01 DOI:10.4208/JAMS.101015.111315A

C. Xia, X. Miao

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引用次数: 6

摘要

本文采用分裂算符法和Lewenstein强场近似理论两种方法，从理论上研究了氦原子模型中高次谐波和孤立阿秒脉冲的产生。一个左圆偏振脉冲(800 nm)与一个右圆偏振脉冲(1200 nm)相结合，延时为4 fs。在I0=7×10W/cm的情况下，获得了带宽为215 eV (230 ~ 445 eV)的超连续谱平台。通过在平台区叠加带宽为70 eV的脉冲，可以得到一个持续时间约为56秒的线极化孤立阿秒脉冲。此外，我们还利用Morlet小波变换方法从时频分析的角度阐述了量子路径控制。pac: 32.80.Rm 42.65.Ky

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Theoretical study of isolated attoseond pulse generation with two methods

We theoretically investigated high-order harmonic generation and isolated attosecond pulse generation from a model of helium atom by two methods: numerically solve time dependent Schrodinger equation (TDSE) by splitting-operator method and Lewenstein’s strong field approximation theory. A left circularly polarized pulse (800 nm) is combined to a right circular polarized pulse (1200 nm) with a timedelay of 4 fs. A supercontinuum spectrum plateau with a broad bandwidth of 215 eV (from 230 to 445 eV) is obtained for the case of I0=7×10W/cm. By superposing a bandwidth of 70 eV in the plateau region, an linear polarized isolated attosecond pulse with the duration of about 56 as can be obtained. Moreover, we illustrate the quantum path control in terms of the time-frequency analysis by Morlet wavelet transform method. PACS: 32.80.Rm,42.65.Ky

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Journal of Atomic and Molecular Sciences PHYSICS, ATOMIC, MOLECULAR & CHEMICAL-

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