锁相频率合成功率源与晶体介质谐振腔匹配网络

论述了锁模激光的调制器晶体谐振腔与锁相频率合成功率源匹配网络的实现，笔者经过深入研究，提出锁模激光的调制器晶体谐振腔非线性特性，并根据定一论断选择新的器件、网络电路，精心调制完成了难于实现的匹配，给出了实际运用的匹配波形图。     

3月龄大鼠不同大动脉光镜和CLSM观察及定量分析

采取常规石蜡切片和HE染色法制成切片标本，在光镜和激光共聚扫描显微镜（CLSM）下测定升主动脉、胸主动脉、腹主动脉和股动脉的管壁中膜厚度、管腔面积、管壁中膜面积、弹性膜层数和弹性膜荧光强度等，结果表明了由升主动脉至股动脉呈现血管壁中膜变薄、管腔缩小、弹性膜荧光强度降低等变化规律。     

激光频率调制光谱法测量甲烷的吸收光谱

采用激光频率调制吸收光谱技术，实现了国内首次用连续可调谐单膜半导体铅盐激光器测量出泥浆气中（经过简单物理处理）的CH4在3325nm附近的吸收光谱，其高分辨率谱线的测量对实际问题的应用有着重要的意义。     

分离型激光启动靶光电探测系统及信号处理电路

介绍了一种用作分离型激光启动靶的光电探测系统及信号处理电路．半导体激光光源经准直、扩束形成激光光幕，再经距光幕一定距离(3—5m)外的具有原向反射特性的微珠玻璃屏反射回来后经球面反射镜的会聚由光电探测器接收．当弹丸飞越光幕后，光电探测系统可以获取弹丸过靶信号，实现对弹丸运动的研究．章给出了56式7．62mm弹丸实测波形．结果表明该系统有效靶区大，使用灵活方便，适用于大口径或弹道散布较大的弹丸速度的测量，也可用做其它设备(如狭缝相机等)的触发信号源．     

应用激光闪光法测量薄膜材料的热扩散率

目的是将用于测量片状试样的热扩散率的激光闪光法推广至测量薄膜试样。应用 1 5纳秒脉冲 Nd:YAG激光及响应时间 0 .9微秒的 (Hg,Cd) Te红外探测器等建立了闪光法热扩散率测量系统 ,并应用此系统对微米量级厚度的不锈钢薄膜进行了测量。同时针对将激光闪光法应用于薄膜时所出现的问题 ,如激光的有限脉冲时间及有限吸收厚度效应 ,测量系统的滞后效应 ,以及增强红外吸收及辐射用表面黑化膜的影响进行了分析并提出了解决方法     

Cu-Mn合金的激光表面快速熔凝

为对 Cu- 2 7.3% Mn合金在超高温度梯度快速定向凝固条件下的组织形成规律和胞晶间距进行研究 ,利用5 k W CW CO2 激光器进行了一系列激光表面重熔实验。实验结果表明 :在快速凝固条件下 ,随着凝固速度的提高 ,Cu- 2 7.3% Mn的组织由低速平界面向胞晶、超细胞晶和不规则组织转变 ;当凝固速度达到 2 12 .6 mm /s时 ,生长达到绝对稳定 ;在所有凝固速度范围内无枝晶组织出现。在激光表面快速熔凝过程中 ,从熔池底部到顶部胞晶间距略有减小 ,且间距的选择具有历史相关性。     

激光原子法同位素分离中三维原子分布函数的计算

在激光同位素分离中 ,激光作用区内原子的密度和速度分布对分离过程有重要影响。目前 ,理论上对这个问题的研究还都限于二维情形。该文根据激光同位素分离装置中激光作用区原子密度较低的特点 ,在忽略原子碰撞的条件下给出了一种计算三维空间内原子速度分布函数的方法。利用该方法对小尺度蒸发实验进行计算所获得的结果在定性和定量上都与实验测量符合的很好。     

Formation of substitutional metallofullerenes by laser ablation of externally doped fullerenes C60M x (M=Sm, Pt, Ni and Rh)

Photofragmentation study of metal fullerides C₆₀M _x (M = Sm, Pt, Ni and Rh) by excimer laser ablation-TOF mass spectrometry shows that metallofullerenes C_2n M and C_2n+1M formed in both the positive and negative ionic modes. The isotopic distributions of the metallofullerenes C_2n M and C_2n+1M are consistent with the calculated spectra based on the natural abundance of isotopes of C and M, confirming the formation of metallofullerenes. The metal atom is supposed to be incorporated into the network of the fullerene cage to replace one carbon atom of the cage forming substitutional metallofullerene. Odd-numbered high carbon clusters are observed in our laser ablation study of all the metal fullerides in the negative ion channel. Evolution of mass spectrum with irradiation laser shots shows that the formation of the substitutionally doped fullerenes is closely related to the production of metal carbide (MC). The structures, as well as formation mechanism, of metallofullerenes C_2n+1M and C_2n M with even and odd numbers of total atoms respectively are discussed based on the structural optimization of the odd-numbered high carbon clusters.     

Correlation of coral fluorescence with nearshore rainfall and runoff in Hainan Island, South China Sea

Under UV-laser excitation, the Porites coral from Longwan bay waters. Hainan Island, could emit yellow-green fluorescence. After fitting the data of the fluorescent intensity (FI) of the coral with the rainfall (RF) in nearshore area of Qionghai. a good relationship between FI and RF was found with a linear formula of RF = 889 — 4.54 FI and a correlation coefficient of 0.78. Based on this formula, the rainfall sequence from 1982 to 1997 has been reconstructed. The peak annual rainfall is usually related to global El nino events. By fitting the data of the fluorescent intensity and the runoff (RO). a quadric formula was obtained as RO = — 0.0279FI —18.59 FI - 950.9 with a correlation coefficient of 0.74. The reconstructed runoff sequence from 1982 to 1997 coincided with the rainfall occurrence. The results indicate that flood and drought incidents in coastal areas of the south China are affected by global change to a great extent.     

准分子激光微细加工

准分子激光对无机和有机材料都有着很好的消融和蚀刻性能 .本文主要描述了准分子激光消融和蚀刻在微细加工方面的应用