双参数形变谐振子湮没算符高次幂本征态的量子统计性质

研究双参数形变谐振子湮没算符高次幂本征态的量子统计特性. 结果表明, 当k为偶数时它们都可存在N次方压缩; 并且它们均可呈现反聚束效应.     

超声速流体Kelvin-Helmholtz不稳定性速度梯度效应研究

利用加权本质上无振荡（WENO）方法模拟超声速流体Kelvin-Helmholtz（KH）不稳定性,研究速度梯度对KH不稳定性线性增长率和后期非线性演化的影响.模拟发现超声速流体中的速度梯度对KH不稳定性具有较强的致稳作用,给出了包含速度梯度致稳的线性增长率经验公式.数值模拟和经验公式符合得很好.模拟给出了清晰的流场密度等值线,这说明WENO方法模拟超声速流体KH不稳定性具有较好的界面变形捕捉能力.模拟结果表明速度梯度影响KH涡的演化,在给定密度梯度的情况下速度梯度越大KH涡的横向尺度越小. 关键词： Kelvin-Helmholtz不稳定性 超声速流体 速度梯度     

高功率台式激光器原理及应用

简介了台式激光器的发展与CPA技术,分析了高功率台式激光器的性能和价值,并对未来的应用作了展望．     

半椭球形和子弹头形光纤传感探头的耦合特性

 利用光路追踪程序，对于不同光纤参数条件下半椭球形和子弹头形光纤传感探头的耦合特性进行了研究。研究结果表明：对于半椭球形探头，当长短轴之比在1.15和1.3附近时存在一个耦合最佳结构；而对于子弹头形探头，仅变成圆形时为最佳。这两种探头容易制作，半椭球形探头的耦合效率高于子弹头形。     

Effects of Density and Thickness of Interlayer on RT Instability of Interfaces

This work focuses on the characteristics of the Rayleigh-Taylor Instability （RTI） of the interfaces formed by two semi-infinitely distributed fluids and one interlayer. In consideration of the coupling effects between the interfaces, the expression of the growth rate is obtained. The result reveals that the instability growth rate depends on the density and thickness of the interlayer. It is found that /f the interlayer thickness is less than 0.6 times of the disturbing wavelength, the coupling effects should be considered.     

The polarization effect of a laser in multiphoton Compton scattering

The multiphoton Compton scattering in a high-intensity laser beam is studied by using the laser-dressed quantum electrodynamics(QED) method, which is a non-perturbative theory for the interaction between a plane electromagnetic field and a charged particle. In order to analyze in the real experimental condition, a Lorentz transformation for the cross section of this process is derived between the laboratory frame and the initial rest frame of electrons. The energy of the scattered photon is analyzed, as well as the cross sections for different laser intensities and polarizations and different electron velocities. The angular distribution of the emitted photon is investigated in a special velocity of the electron, in which for a fixed number of absorbed photons, the electron energy will not change after the scattering in the lab frame.We obtain the conclusion that higher laser intensities suppress few-laser-photon absorption and enhance more-laser-photon absorption. A comparison between different polarizations is also made, and we find that the linearly polarized laser is more suitable to generate nonlinear Compton scattering.     

基于自相似模型的二维X射线激光等离子体流体力学

从自相似方法出发,建立了简化的二维X射线激光等离子体流体动力学模型. 利用该模型研究了平板靶X射线激光的二维流体力学行为. 研究表明,当激光作用结束后,经过一段时间的演化电子密度和温度沿线聚焦方向逐渐达到平衡,该结果对X射线激光的优化设计具有重要意义. 关键词： X射线激光 二维流体力学计算 自相似方法     

光栅衍射的初步分析

通过三角函数的计算,得到衍射光栅强度分布;并讨论了主极大、极小、次极大和缺级等现象。     

AN ANALYTIC MODEL FOR TRANSIENT COLLISIONAL X-RAY LASERS

A set of similarity equations is derived to describe the hydrodynamics of transient X-ray lasers from slab plasmas generated by combined irradiation of nanosecond and picosecond laser pulses. By separating nanosecond and picosecond laser heating processes into different periods, analytical solutions are obtained for the similarity equations. The calculated results are in agreement with numerical simulations and experimental data.