利用超短脉冲激光和光电子能量微分谱直接测量窄带飞秒超紫外线XUV脉冲的时间结构

介绍用亚皮秒超短激光脉冲直接测量窄带飞秒真空超紫外线(XUV)脉冲时间结构的方法. 可以由XUV激发惰性气体产生、并在与超短脉冲激光的线性极化方向成0°或90°的方向上测量 得到的光电子能量微分谱重建这种时间结构. 谱仪的能量分辨率和所选取的能量间隔大小是 测量及计算的两个重要参数. 上述方法有很宽的时间测量范围和很高的分辨率，可以用于飞 秒计量学和与原子运动有关的超快速动力学过程的研究. 关键词： 超快速测量 超短脉冲激光 超紫外线(XUV)时间结构 光电子能量微分谱

Direct measurement of the temporal structure of narrow bandwidth femtosecond XUV using ultra-short laser via differential photoelectron energy spectrum

A method is introduced to directly measure the temporal structure of femtosecond XUV which has a narrow bandwidth using sub_picosecond duration laser. Calculati on shows that such a temporal structure can be reconstructed from the differenti al photoelectron energy spectrum excited by XUV or x ray, modulated by a laser field and measured at 90° or 0° with respect to the linear laser polarizatio n. The effectiveness and nonlinearity of the method are investigated. Energy res olution and bin(s) are important parameters for measurement and calculation. The method has a broad temporal measurement range and can be used for researches of dynamic processes associated with atomic motions.