飞秒超短脉冲激光加热金属平面靶

从能流分析出发,对飞秒超短脉冲激光与金属平面靶相互作用的机制进行了理论研究,对其中主要物理过程的能流损耗作了详尽的分析,并根据一维,双温热扩散模型推导了自由电子温度随时间变化的函数关系.并从理论上推导了超短脉冲近似假设成立的脉宽范围和在此条件下自由电子所能达到的最高温度表达式.     

Spectroscopic and lasing characteristics of 1,3,5,7-tetramethyl-8-ethyl-pyrromethene-BF2 complex

The basic optical properties of the newly synthesized pyrromethene-BF2 derivative (Compound 1) were investigated systematically by its ultraviolet to visible (UV-visible) absorption, fluorescence and triplettriplet absorption. Its lasing characteristics were measured on a dye laser system pumped by a continuous wave Ar ion laser. The results suggest that, compared with the typical pyrromethene-BF2 dye such as P546, Compound 1 possesses stronger fluorescence and lower triplet-triplet absorption over its fluorescence spectral region. Excellent laser properties were also observed for Compound 1. It outperforms the commercially available benchmark laser dye rhodamine 6G in laser wavelength tuning range, which proves that Compound 1 is probably a potential candidate to be developed as the all-solid-state laser material.     

Sub-picosecond chirped laser pulse-induced airflow and water condensation in a cloud chamber

Sub-picosecond chirped laser pulse-induced airflow and water condensation were investigated in a cloud chamber.The results indicate that the positively chirped sub-picosecond laser pulses generate a more uniform intensity distribution inside the plasma column, leading to a weaker airflow and an elliptic-shaped snow pile. The negatively chirped sub-picosecond laser pulses generate a spark-like intensity distribution inside the plasma column, which produces a wider range of airflow and a round snow pile. The amount of snow weight and the concentration of NO_3~- are found to be dependent on the intensity distribution inside the plasma column. The visibly stronger plasma column generates much more snow and a higher concentration of NO_3~-. These experimental results provide a reference for sub-picosecond laser-induced water condensation in realistic atmospheric conditions.     

激光等离子体相互作用中的受激布里渊散射

本文的研究表明,在亚毫微秒脉宽的高强度激光等离子体相互作用中,如入射激光包含有明显的预脉冲,则能从激光的后向反射率的剧增、后向反激光光谱的红移并加宽、离子总动能与快离子发射的明显减少以及大角度散射激光的增强等方面,自洽地证实受激布里渊散射的发生。 关键词：     

稠环芳烃有机物的三阶非线性光学性能研究

采用Ｎｄ：ＹＡＧ皮秒锁模脉冲激光λ＝５３２．０ｎｍ,运用３Ｄ前向简并四波混频（ＤＦＷＭ）的方法,测量了稠环芳烃中的１．２．５．６二苯并蒽（Ｃ２２Ｈ１４）,１．２．８．９．二苯并五苯（Ｃ３０Ｈ１８）的三阶非线性极化率Ｘ＾（３）,非线性折射系数ｎ２以及三阶非线性的时间响应。发现该类材料具有较大的非线性效应,文中分析了非线性形成机制以及相关的影响因素。     

一种新的亚酞菁的共振三阶非线性光学性质

用简并四波混频技术研究了一种新的亚酞菁(三新戊氧基溴硼亚酞菁)的三阶非线性光学性质.测得纯固体三新戊氧基溴硼亚酞菁的三阶非线性极化率χ(3)pure和分子二阶超极化率〈γ〉分别为69×10-10esu和30×10-31esu.χ(3)pure的响应时间为20ps.并对这些结果进行了讨论     

类钠铜离子的激发自电离

在扭曲波库仑玻恩交换近似下计算了类钠铜离子２ｐ^６３ｓ＋ｅ^-→２ｐ⁵３ｓ３ｌ＋ｅ^-（ｌ＝０，１，２）的内壳层激发截面．结合单组态近似和组态相互作用两种情况下计算的自电离分支比，计算了上述组态的激发自电离截面．结果表明，在入射电子能量为１０９０ｅＶ时，组态相互作用使２ｐ⁵３ｓ３ｄ总的激发自电离截面增大至单组态近似的近两倍；而使２ｐ⁵３ｓ²组态的激发自电离截面减小为单组态近似的３６％；２ｐ⁵３ｓ３ｐ组态的激发自电离截面只是略有下降 关键词：     

激光拍频波加速器的参数选择

本文研究了激光拍频波加速器中的三波相互作用过程。结果表明:适当地选择参数σ=ω_p/(ω₁-ω₂)以及β=ω₂/ω₁(ω_p,ω₁,ω₂分别为等离子体频率及两束激光频率),即可用较弱的激光造成很强的拍频等离子体波,并使注入等离子体的电子获得显著的能量增益。 关键词：     

低频激光场中二能级原子的高次谐波

在外场频率远远低于能级跃迁频率的情况下，推导出了二能级原子在低频激光场作用下的诱导极化所满足的运动方程，并通过在弱场和超强场两种情况下对该方程的解析求解，得到了在这两种相应情况下产生于二能级原子的高次谐波的特性. 关键词：     

人血清白蛋白与3-氨甲基吡啶相互作用的拉曼光谱研究

测量人血清白蛋白和一种新型仿生配基3-氨甲基吡啶与人血清白蛋白复合物的拉曼光谱。Raman光谱表明3-氨甲基吡啶与人血清白蛋白结合导致人血清白蛋白的构象及其结构的变化。人血清白蛋白的主链构象主要是α-螺旋结构,3-氨甲基吡啶结合不改变其二级结构,但二硫键的构象产生改变,唯一的色氨酸残基外环境由亲水变为疏水,酪氨酸所处的外环境也发生改变。