中红外激光相位测量及阿秒脉冲的产生

发布时间：2018-01-13 11:11

本文关键词：中红外激光相位测量及阿秒脉冲的产生　出处：《激光技术》2017年02期 　论文类型：期刊论文

【摘要】：为了测量中红外激光相位及获得阿秒脉冲,采用高次谐波截止能量随激光相位改变而变化的方法,进行了中红外激光相位测量及阿秒脉冲输出的研究。引入一束少周期激光场后,组合场相位对谐波发射截止能量的影响要比单独中红外激光场相位对谐波截止能量的影响明显很多。因此,提出了一种利用谐波截止能量与相位角的对应关系测量多周期中红外激光相位的方法。同时理论研究了3束中红外激光场下发射高次谐波及阿秒脉冲的特点。结果表明,适当调节3束激光场的延迟时间和相位角,不仅谐波发射的截止能量得到了延伸,而且单一的量子路径也被选择出来对谐波发射起作用,形成了一个272eV的平台区;通过叠加谐波谱上的谐波,可获得一系列脉宽为34as的X射线光源。该研究对中红外激光相位测量及阿秒脉冲的输出是有帮助的。
[Abstract]:In order to measure the phase of the mid-infrared laser and obtain the attosecond pulse, the high-order harmonic cut-off energy is changed with the change of the laser phase. The phase measurement of mid-infrared laser and the output of attosecond pulse are studied. The effect of the combined field phase on the cut-off energy of harmonic emission is much more obvious than that of the phase of the mid-infrared laser field alone. This paper presents a method of measuring the phase of infrared laser in multi-period by using the corresponding relation between the cut-off energy of harmonics and the phase angle. At the same time, the characteristics of high-order harmonic and attosecond pulses emitted under three beams of mid-infrared laser field are theoretically studied. The fruit shows. By adjusting the delay time and phase angle of three laser fields properly, not only the cut-off energy of harmonic emission is extended, but also a single quantum path is selected to act on harmonic emission. A 272eV platform region is formed. A series of X-ray light sources with a pulse width of 34 as can be obtained by superimposing the harmonics on the harmonic spectrum. This study is helpful for the phase measurement of the mid-infrared laser and the output of the attosecond pulse.
【作者单位】：辽宁工业大学化学与环境工程学院;辽宁工业大学理学院;中国科学院大连化学物理研究所分子反应动力学国家重点实验室;
【基金】：国家自然科学基金资助项目(11504151) 辽宁省博士科研启动基金资助项目(201501123) 辽宁省教育厅基金资助项目(L2014242)
【分类号】：TN24
【正文快照】： 引言超短激光技术的发展,使得人类可以探索尺度越来越小的物理过程。尤其是过去10年内发展起来的阿秒激光技术,极大地拓展了人们对原子、分子运动的认识。例如,利用单个阿秒脉冲观测俄歇电子的产生[1]、原子隧穿电离[2]、分子电离解离过程[3-5]等。高次谐波作为产生单个阿秒脉

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