高能COIL偏振态的实验研究

 通过两块楔镜补充衰减和中性衰减片相结合的能量衰减方法,测得了功率密度为20 W/mm² COIL的偏振态。采用角反射器作为稳定腔折返装置,提高了激光能量分布的均匀性。激光光束分别以45°的入射角入射到两块楔镜上,被楔镜反射后,垂直通过中性衰减片,最后进入偏振态测试仪。实验结果表明：在腔内没有任何偏振选择器件和不加外部电磁场的情况下,采用折叠式稳定腔的横流双模块氧碘化学激光光束呈现部分偏振性质,而且在出光过程中偏振度逐渐降低。     

三棱镜最小偏向角法测波长实验研究

根据三棱镜对光的色散原理,提出了用分光计观测原子光谱并用最小偏向角对各谱线进行标记,比较光谱的位置,从而用内插法测得了未知谱线的波长。实验结果表明：使用三棱镜最小偏向角尺度分析法测定波长有其可操作性和一定的应用意义。     

精确测量棱镜材料折射率的改进方法

介绍一种测量棱镜材料折射率的简单方法———垂直入射法,该法原理和测量过程简单,有较高的测量精确度,利用这种方法来测量棱镜材料的折射率,所测结果与已知折射率非常近似,具体误差不超过0.015%.     

棱镜转动定理

棱镜成像是静态问题，转动棱镜的成像方位变化属动态问题。反射棱镜绕某轴旋转，其特征方向就绕同一根轴转至新的方位，利用与的简单关系，比较特征方向处于新、旧两种方位时的棱镜成像，同时得到了棱镜调整计算的显式简单公式和“棱镜转动定理”。     

颗粒尺寸对砂岩集料压蒸膨胀行为的影响

为研究和改进中国压蒸法检测砂岩类集料碱活性的适应性,以混凝土棱柱体法为基准,采用中国压蒸法研究了9种国内外砂岩类集料的碱活性,同时研究了集料颗粒粒径对砂浆试体压蒸膨胀行为影响.结果表明:中国压蒸法不能准确评定某些砂岩集料的碱活性且砂浆试体膨胀结果与混凝土中的膨胀结果相关性较差;颗粒粒径0.16～0.63 mm不是最敏感粒级;采用粒级1.25～2.50 mm、试体尺寸20 mm×20 mm×80 mm,在150 ℃、1 mol/L NaOH溶液中压蒸30 h可以大大改善中国压蒸法对砂岩类集料的适应性.     

Synthesis and Crystal Structure of 1,2-Bis-（p-nitrophenylsulfonamido）-4,5-dinitrobenzene

The title compound, 1,2-bis-(p-nitro-phenylsulfonamido)-4,5-dinitrobenzene, was synthesized and characterized by elemental analysis, IR and 1H NMR. A pale yellow prism crystal of C23H26N8O13S2 (Mr = 686.64) was obtained in DMF solution and determined by single-crystal X-ray diffraction method. It crystallizes in triclinic system, space group P1 with a = 10.346(4), b = 12.210(5), c = 12.976(5) , α = 108.220(8), β = 99.482(4), γ = 95.490(4)°, V = 1516.7(10) 3, Z = 2, Dc = 1.504 g/cm3, F(000) = 712, μ = 0.254, Mr = 686.64, the final R = 0.0561 and wR = 0.1487. One sulfonamido group of the title compound is deprotoned and forms N(3)=C(13). The crystal involves N,N-dimethylamine from the decomposition of DMF and the proton is transferred to N,N- dimethylamine. It is a strong proof for the characterization of deprotoned recognition compound by X-ray single-crystal structure.     

辅助棱镜对半荫视场的影响

在掠入射法测定液体折射率实验中，增加辅助棱镜可提高半荫视场的清晰度，从而提高测量精度．本文讨论了增加不同形状的辅助棱镜后对半荫视场的影响．     

偏光分束镜分束角的不对称性研究

文中给出了渥拉斯顿棱镜分束角的不对称性,并对通过调整胶合介质层来消除可调分束角棱镜的不对称性进行了分析。     

Design of a laser pointer

A laser pointer has been designed using a red diode laser (670 nm). The optics of the pointer consists of a four element collimating lens, two prism compressor and a two lens reversed Galilean afocal. The beam diameter of the laser pointer is 4.2 mm.     

Theoretical analysis on the change of Marple–Hess prism''s transmittance with incident angle

In order to study the change of Marple–Hess prism's transmittance with the incident angle, all parameters related to the prism are put in a mathematical model of three coaxials system. Using Fresnel formula and multiple-beam interference theory to study the interference's effect on the transmittance in detail, we deduce a precise transmittance formula. Through the theoretical calculation, the change of transmittance with azimuth angle and plane incident angle is periodical. The frequency and amplitude of the transmittance's fluctuation will increase with increase of plane incident angle's absolute value.