飞秒激光氘团簇库仑爆炸引发核聚变的机理研究

在超强飞秒激光与氘团簇的相互作用中，利用库仑爆炸模型，分析了可以引发核聚变的高能氘核产生的机理，提出了氘离子团簇膨胀尺寸与时间的关系式，计算了多种尺寸的氘团簇库仑爆炸时氘核的动能以及氘团簇的解体时间． 关键词： 飞秒强激光 氘团簇 库仑爆炸 核聚变     

A Two-Photon Femtosecond Laser System for Three-Dimensional Microfabrication and Data Storage

Utilizing the well-focused femtosecond laser with extreme high pulse intensity, we built a two-photon micro-fabrication and data storage system, which was introduced through several functional parts. Based on this homemade system, several three-dimensional microstructures were fabricated by two-photon polymerization, and three-dimensional data storage of six-layers was achieved by two-photon excitation with a photochromic material.     

飞秒脉冲激发的动力学光谱理论——Ⅱ.解离反应的发射光谱

应用飞秒脉冲激发的动力学光谱理论于解离反应体系,在超短脉冲近共振条件下Raman光谱中会出现FL散射.发射光谱的性质可以由相关函数来解释.     

源啁啾飞秒孤子间相互作用的数值研究

对源啁啾飞秒孤子间的相互作用进行了数值研究，结果表明源啁啾飞秒孤子间的相互作用比无源啁啾时更加严重，会在通信系统中造成更大的误码率，研究结果还表明，不等幅传输法在一定程度上可有效地抑制源啁啾飞秒孤子间的相互作用。     

掺杂CdS超微粒的ZrO2薄膜的光学性质

研究了用溶胶凝胶方法制备的CdS超微粒 ZrO2 薄膜的发光特性 ,测量了不同退火温度处理的样品的荧光光谱、荧光激发光谱和荧光衰减曲线的变化 ,通过荧光衰减曲线研究了 14 0 ps左右的CdS的带间跃迁发射和较慢的表面态发射。还测量了这种掺有CdS超微粒的ZrO2 薄膜的飞秒光克尔效应 ,得到三阶非线性光学极化率为4 4× 10 - 1 1 esu和大约 10 0fs的响应时间。结果表明 ,这类材料具有较大的光学非线性和快速的响应时间 ,在高速光开关等方面有潜在的应用前景     

非线性光学及其若干新进展

扼要介绍了非线性光学的基本概念及其最近10年来在飞秒激光，半导体材料，光纤通信和光信息存储等若干方面的研究进展。     

飞秒激光光镊的理论研究

本文从理论角度论证了飞秒激光作为光镊光源的可行性，给出了飞秒激光作用时微粒所受力理论计算公式，并在此基础上给出了对应于不同参数的光镊稳定性图形。我们还进一步分桥了飞秒激光作为光镊光属相对于其他激光的特有性质。     

Relaxation of Dense Electron Plasma Induced by Femtosecond Laser in Dielectric Materials

Electron plasma induced by a focused femtosecond pulse （130 fs, 800 nm） in dielectric materials （Soda Lime glass, K9 glass, and SiO2 crystal） is investigated by pump-probe shadow imaging technology. The relaxation of the electron plasma in the conduction band is discussed. In SiO2 crystals, a fast self-trapping process with a trapping time of 150fs is observed, which is similar to that in fused silica. However, in Soda Lime glass and K9 glass, no self-trapping occurs, and two decay processes are found： one is the energy relaxation process of conduction electrons within several picoseconds, another is an electron-hole recombination process with a timescale of lOOps. The electron collision time T in the conduction band is also measured to be in the order of 1 fs in all of these materials.     

Widely Tunable Femtosecond Soliton Pulse Generation by Using Soliton-Frequency Shift in a Photonic Crystal Fibre

Femtosecond Raman soliton generation, tunable from 800 to 1044nm, has been theoretically investigated for a photonic crystal fibre pumped by a 200-fs pulse. A highly nonlinear photonic crystal fibre with a length of only 57.7cm and a nonlinear coefficient of 0.075 (Wm)^-1 is used to achieved such a broadband. It is found that the spectral bandwidth increases with the input peak power. In particular, it is also found that the output wavelengths of the resulting sub-40 fs Raman solitons can also be tuned effectively by varying the initial pulse chirp. There exists an optimal positive chirp which maximizes the bandwidth, corresponding to the formation of only one long-wavelength Raman soliton.