铜类氖离子能级上粒子数分布

采用等离子体复合抽运x射线激光模型,本文从四能级速率方程出发,计算了铜的类氖离子2p~6、2p~53s、2p~53p能级上的粒子数分布、反转、x激光增益系数与等离子体参数的关系。结果发现:电子温度的上升和自由电子密度的快速衰减都会影响体系粒子数反转的峰值和发生的区域。另外,理论结果也表明:在等离子体过高、过低的密度区域都不可能使3s-3p态能级间发生粒子数反转。     

软X光激光增益实验研究

我们在中国科学院上海光机所的6路钕玻璃激光装置上,取得了复合泵浦类锂Al~(10+)的软X光(10.57nm,15.46nm)辐射的显著受激放大的实验证明.本文报道的软X光激光增益实验是利用6路激光装置中的两束激光合并而成的一束激光完成的.激光经柱面透镜-非球面透镜组合而聚焦到平面铝靶上,焦线长度8mm,宽度约200μm.1064nm激光脉冲由双脉冲构成,单个脉冲的宽度约为250Ps,而两个脉冲的峰值间隔为200ps;激光能量约为20J,聚焦的激光强度约为2.5×10~(12)W/cm~2.实验中使用厚度为1mm的条状平板靶;选择靶的宽度     

超短脉冲强激光场产生高次谐波相位匹配技术的最新研究进展

总结了超短脉冲强激光场高次谐波产生相位匹配技术的最新进展;对高次谐波相位匹配的理论进行了讨论,并对相位匹配技术的应用提出了一些看法.     

中红外强场原子光电离与“水窗”波段高次谐波产生

强场物理是当今物理学研究的重要前沿领域,强光场中原子、分子的电离动力学研究则是强场物理领域的基础与研究热点     

阿秒啁啾的动态补偿

强场高次谐波(HHG)与阿秒脉冲的产生是重要的前沿科学研究领域。阿秒脉冲以前所未有的精度探测超快电子动力学以及可     

The Electron Trajectory in a Relativistic Femtosecond Laser Pulse

In this report, we start from Lagrange equation and analyze theoretically the electron dynamics in electromagnetic field. By solving the relativistic government equations of electron, the trajectories of an electron in plane laser pulse, focused laser pulse have been given for different initial conditions. The electron trajectory is determined by its initial momentum, the amplitude, spot size and polarization of the laser pulse. The optimum initial momentum of the electron for LSS （laser synchrotron source） is obtained. Linear polarized laser is more advantaged than circular polarized laser for generating harmonic radiation.     

等离子体尾波的数值研究

应用一维粒子模拟方法（Ｐａｒｔｉｃｌｅ－ｉｎ－Ｃｅｌ）数值研究了超短超强激光（Ｉλ２＞１０１８Ｗμｍ２／ｃｍ２）和稀薄等离子体相互作用后等离子体尾波的产生及其对电子的加速。结果表明，单束激光和拍波与稀薄等离子体相互作用后，在等离子体中都能激发起尾波，但拍波激发的等离子体尾波的强度和波长较大，同时等离子体中的电子动量也给加速得比较大     

Red Shift and Broadening of Backward Harmonic Radiation from Electron Oscillations Driven by Femtosecond Laser Pulse

The characteristics of backward harmonic radiation due to electron oscillations driven by a linearly polarized fs laser pulse are analysed considering a single electron model. The spectral distributions of the electron＇s backward harmonic radiation are investigated in detail for different parameters of the driver laser pulse. Higher order harmonic radiations are possible for a sufficiently intense driving laser pulse. We have shown that for a realistic pulsed photon beam, the spectrum of the radiation is red shifted as well as broadened because of changes in the longitudinal velocity of the electrons during the laser pulse. These effects are more pronounced at higher laser intensities giving rise to higher order harmonics that eventually leads to a continuous spectrum. Numerical simulations have further shown that by increasing the laser pulse width the broadening of the high harmonic radiations can be controlled.     

双频激光与原子相互作用产生的光电子谱

本文提出一种双频激光与原子相互作用的简单模型,并对由该模型产生的光电子谱进行了计算,分析了光电子峰的结构。