短脉冲泵浦类锂铝离子X射线激光模拟

建立了适合描述短脉冲激光泵浦类Ｌｉ离子产生Ｘ射线激光的简化流体和原子动力学模型。短脉冲激光泵浦纤维靶产生等离子体的电子密度、电子温度、电离态分布等和驱动激光功率密度、脉宽及纤维靶半径相联系。研究了类Ｌｉ铝离子４ｆ－３ｄ跃迁激光增益系数随时间的演化过程，以及峰值增益和泵浦激光功率、脉宽及纤维靶半径之间的关系。     

Plasma Approach for Generating Ultra-Intense Single Attosecond Pulse

In our previous work, a plasma approach for single attosecond pulse (AP) generation was proposed. A few-cycle relativistic circularly polarized laser pulse will induce a single drastic oscillation of plasma boundary, from which high-order harmonics and furthermore an ultra-intense single AP can be generated naturally after it is reflected. Analytical model and simulations both demonstrate that the process is mostly efficient as the pulse duration is close to the plasma responding time. The effects of plasma density ramp are analyzed here, suggesting that the proposal is still quite efficient with appropriate density gradient in the ramp. At last, a combined approach is employed to obtain single AP with 30 fs incident laser. The relatively large-duration pulse is firstly shortened by a density dropping thin foil, and then reflected from an overdense plasma target. One-dimensional simulation shows that a 600 as single light pulse is generated with peak intensity of 3×10^20 W/cm^2.     

超强超快激光物理与前沿应用

超强超快激光的出现与迅速发展开辟了原子分子物理、强场物理、等离子体物理等学科的诸多前沿方向,促进了物质科学、生命科学和信息能源等领域的创新发展。以超强超快激光的强度为尺标,首先介绍强激光驱动的非线性原子分子物理,其次是更高光强下的超强激光与相对论等离子体物理,最后概述强场超快的交叉前沿应用。在每个领域的学科发展背景下,重点概述中国科学院上海光学精密机械研究所强场激光物理国家重点实验室长期深耕超强超快激光物理与前沿应用取得的系列进展与成果,主要包括小型化粒子加速与辐射、极端强场效应、高次谐波与阿秒物理、空气成丝与空气激光、超快激光加工、微纳激光技术等。     

Demonstration of X-ray Thomson Scattering on Shenguang-Ⅱ Laser Facility

X-ray Thomson scattering technique for diagnosing dense plasma was demonstrated on Shenguang-Ⅱ laser facility. Laser plasma x-ray source of titanium He-a lines (-4.75 keV), generated by laser beam (1.5 kJ/527 nm/2 ns) heated titanium thin foil, was used as x-ray probe beam. The x-ray probe was then scattered by cold CH foam column of 1 g/cm^3 density. The scattered radiation at 90° was diffracted by polyethylene terephthalate (PET) crystal and recorded on x-ray charge-coupled device. Well-defined scattering spectra were obtained with good signal to noise ratio.     

相对论效应产生的高次谐波

用单电子模型研究了相对论效应，特别是相对论坐标变换所引起的高次谐波，得到了谐波产生和激光强度的关系，还得到了谱分布和观测角的关系，特别给出了谱线强度分布的周期和观测角的关系。这一效应可以定性解释相对论强激光和固体靶相互作用所产生的高次谐波     

类锂硅软X射线激光模拟

类锂硅软Ｘ射线激光模拟沈百飞，王晓芳，徐至展，腾华国，张文琦（中国科学院上海光机所，上海２０１８００）周忠源，潘守甫（吉林大学原子与分子物理研究所，长春１３００２３）类锂离子方案是软ｘ射线激光复合泵浦机制的一个非常重要的方案，复合机制具有所需泵渝光功...     

利用类锂离子4f－3d跃迁与4d－3p跃迁强度比测等离子体的电子密度的实验研究

利用类锂离子４ｆ－３ｄ跃迁与４ｄ－３ｐ跃迁强度比测等离子体的电子密度的实验研究李儒新，沈百飞，王晓方，陆培详，韩申生，范品忠，张正泉，徐至展（中国科学院上海光机所，上海２０１８００）等离子体的电子密度的测量一直是等离子体基本参数测量最重要的内容之一，...     

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.     

基于激光引导的静电激波产生单能重离子束

惯性约束聚变的快点火方案、癌症治疗等这些重要的应用均需要单能的离子柬.近来通过激光与等离子体相互作用加速产生高能离子已经成为一个研究热点,因其造价和占用空间都远小于传统加速器.同前已经提出了很多种加速机制,其中靶后鞘层加速较为成熟,实验上已经利用强度为3×1020 w·cm-2的激光产生出最高能量为58 MeV的质子束,也有利用微结构靶产生能散度约为20%的质子束.本文研究的足另一种重要的加速机制,激波加速.