一种新型偏振分光棱镜的设计和应用

一种新型的偏振分光棱镜结构,实现了将偏振态相互垂直的光以不同的角度输入后合为一 束的功能,尤其能与双光纤准直器配合使用。通过计算说明二者角度可相互匹配,并分析了在准直器的角度加工出现小的偏差时,通过微量调节输入光束的方向能予以补偿。实验将该棱镜用于偏振光合束器和光学环行器等无源器件中取得了良好效果。     

采用偏振分不棱镜的光桥式补偿技术

介绍了一种使用偏振分光棱镜的新型光桥式补偿技术，研究了棱镜消光比变化引起的误差。使用该补偿结构的光纤压力传感器实际应用于石油化工门油罐储量计量，其现场运行长期稳定性优于０．２％。     

双频激光干涉仪固定棱镜及活动棱镜的合理安装

本文分析了用双频激光干涉仪对仪器（机床）进行位置检测时，干涉仪固定棱镜（参考棱镜）及活动棱镜的安装合理与否对测量结果的影响。     

采用偏振分光棱镜的光桥式补偿技术

介绍了一种使用偏振分光棱镜的新型光桥式补偿技术。研究了棱镜消光比变化引起的误差。使用该补偿结构的光纤压力传感器已实际应用于石油化工部门油罐储量计量，其现场运行长期稳定性优于０．２％。     

PVA／HEC偏光膜的制备与偏光性能研究

研究了采用聚乙烯醇，羟乙基纤维素为主体材料，内含碘化钾，或者碘化锂，用过氧化氢氧化制备ＰＶＡ／ＨＥＣ偏光膜。实验结果表明，选择４．８０ｇＰＶＡ．０．２０ｇＨＥＣ中含有５ｍｍｏｌＫＩ的基膜，用５％Ｈ２Ｏ２水溶液氧化５ｓ，经拉伸，干燥，可制备柔韧性能好的ＰＶＡ／ＨＥＣ偏光膜。根据实验结果，提出了新法ＰＶＡ／ＨＥＣ膜与Ｉ２形成络合物的机理模型。     

双频激光干涉仪固定棱镜及活动棱镜的合理安装

本文分析了用双频激光干涉仪对仪器（机床）进行位置精度检测时，干涉仪固定棱镜（参考棱镜）及活动棱镜的安装合理与否对测量结果的影响。     

聚乙烯醇偏光膜的制备与评价

采用流延法制备出聚乙烯醇偏光膜．并用紫外可见分光光度仅对含碘及碘、镍、钴偏光膜的光学性能进行了研究．结果表明,偏光膜中加入镍、钴后．偏光膜的单片透光率增加,单片偏光系数及组合偏光率增加．垂直组合时,泄漏光的波峰值左移．     

波片和偏振片对外差干涉仪非线性的影响

为了减小外差干涉仪的非线性误差,必须明确波片和偏振片对非线性误差的影响机理。通过理论分析和试验发现,波片和偏振片位于偏振分光镜之前和之后对非线性的影响是不同的。如果把有误差的波片和偏振片放置在偏振分光镜前面,其误差将100%地引入非线性。如果将相同的这些光学元件安装在干涉仪里面,有可能影响非线性,但通常在高阶误差范围内。     

The Impact of Carbon Nanotube Length and Diameter on their Global Alignment by Dead-End Filtration

Dead-end filtration has proven to effectively prepare macroscopically (3.8 cm²) aligned thin films from solutionbased single-wall carbon nanotubes (SWCNTs). However, to make this technique broadly applicable, the role of SWCNT length and diameter must be understood. To date, most groups report the alignment of unsorted, large diameter (≈1.4 nm) SWCNTs, but systematic studies on their small diameter are rare (≈0.78 nm). In this work, films with an area of A = 3.81 cm² and a thickness of ≈40 nm are prepared from length-sorted fractions comprising of small and large diameter SWCNTs, respectively. The alignment is characterized by cross-polarized microscopy, scanning electron microscopy, absorption and Raman spectroscopy. For the longest fractions (L_avg = 952 nm ± 431 nm, Δ = 1.58 and L_avg = 667 nm ± 246 nm, Δ = 1.55), the 2D order parameter, S2D, values of ≈0.6 and ≈0.76 are reported for the small and large diameter SWCNTs over an area of A = 625 µm², respectively. A comparison of Derjaguin, Landau, Verwey, and Overbeek (DLVO) theory calculations with the aligned domain size is then used to propose a law identifying the required length of a carbon nanotube with a given diameter and zeta potential.     

光学偏振玻璃及其应用

近年来光学偏振玻璃器件在光显示、光通信等领域的应用越来越多，人们越来越关注偏振玻璃的特殊性能和制备工艺。文章详细介绍了光学偏振玻璃的发展历程，系统分析了光学偏振玻璃的偏光原理和偏振性能，介绍了偏振玻璃的制备和应用并讨论了偏振玻璃的发展前景。     

以半导体激光器为光源的准直研究

对半导体激光器的准直装置、温度变化对准直精度的影响、温度控制方法作了论述。试验表明,采用半导体激光器作准直光源,准直的稳定性可达到1×10~(-6)。     

Thermal conductivity of Nd3+ and Yb3+ doped laser materials measured by using the thermal lens technique

Thermal conductivity measurements in various well-known Yb³⁺ and Nd³⁺ doped laser materials are performed by using an all-optical pump–probe approach based on the pump-induced thermal lens phenomenon. The derived values agree well with the existing data and open the way to more extensive and more complete investigations.     

Radial Alignment of Carbon Nanotubes via Dead-End Filtration

Dead-end filtration is a facile method to globally align single wall carbon nanotubes (SWCNTs) in large area films with a 2D order parameter, S_2D, approaching unity. Uniaxial alignment has been achieved using pristine and hot-embossed membranes but more sophisticated geometries have yet to be investigated. In this work, three different patterns with radial symmetry and an area of 3.8 cm² are created. Two of these patterns are replicated by the filtered SWCNTs and S_2D values of ≈0.85 are obtained. Each of the radially aligned SWCNT films is characterized by scanning cross-polarized microscopy in reflectance and laser imaging in transmittance with linear, radial, and azimuthal polarized light fields. The former is used to define a novel indicator akin to the 2D order parameter using Malu's law, yielding 0.82 for the respective film. The films are then transferred to a flexible printed circuit board and terminal two-probe electrical measurements are conducted to explore the potential of those new alignment geometries.     

别汉棱镜的旋像精度分析和装校方法

本文详细讨论了别汉棱镜组的装校误差对光轴偏折的作用,分析了三轴装配误差对像点运动精度的影响,并给出了装配及检测别汉棱镜系统的一种有效方法。     

施密特屋脊棱镜的角度误差分析及加工工艺方法

本文对施密特屋脊棱镜角度误差之间的关系进行了详细分析,并对两种工艺方法进行了比较,给出了提高这种棱镜加工效率的方法。