新型光学塑料——EA光学塑料

新型光学塑料—EA光学塑料系采用合成双酚A环氧丙烯酸双酯,再与苯乙烯共聚固化成型制成的一种光学塑料材料。它的光学性能优越R_D=1.5836,v=32,内应力是现有塑料中最小的,成像分辨率是现有光学塑料中最好的,可以做成像透镜材料。该项成果为光学塑料增添了一个新品种。     

光学塑料的应用

<正> 照相机光学成象系统应用的塑料有聚甲基丙烯酸甲酯、聚碳酸酯和聚苯乙烯-丙烯腈的共聚物。但只限于用在简单价廉的照相机上。高质量照相机的光学成象器,由于考虑到温度严重影响光学性质,所以,仍使用传统的光学玻璃。不过,即使是昂贵的光学取景器现在也     

塑料光学元件及其应用

本文简要地叙述了塑料光学元件的发展,它的特性、制造方法以及它的应用。     

光学塑料

光学塑料是一种非晶体有机高聚化合物。它具有一定的光学、机械和化学特性,能满足光学零件的要求,可制成各种光学零件,着色以后能制成各种滤光片。第二次世界大战期间,光学塑料制成的光学零件已应用于望远镜、瞄准镜、照相机和放大镜中。那时塑料本身的性能差,加工还缺乏经验,产品质量低,一般不为人们所重视,认为塑     

光学塑料的发展与应用

简述光学塑料的发展与应用,介绍光学塑料的品种及性能,塑料透镜的种类和对材料的要求,对今后的发展动向和技术关键进行了探讨。     

分子光学及其应用前景

随着原子光学的快速发展，一门新兴的有关研究中性分子与电场、磁场和光场等物质相互作用及其冷却、囚禁、操控与应用的学科——“分子光学”正在逐步形成．文章首先就分子光学的学术内涵及其研究内容作一简单类比与讨论；其次，就冷分子束的产生与超冷分子样品的实验制备、超冷分子物理与光谱学、非线性与量子分子光学的研究及其最新进展进行简要综述．最后，就分子光学的应用前景进行了展望．     

用于眼镜片的几种光学塑料

本文介绍制造眼镜片用的几种光学塑料,对其主要特性进行了比较,并对今后的发展提出了建议。     

Measuring the refractometric characteristics of optical plastics

Ten types of American, Japanese, and German optical plastic (OP) materials are examined. The principal OPs are analysed: polymethyl methacrylate, polystyrene, polycarbonate, and styrene acrylonitrile. Refractive indices are measured and calculated for the principal and some new applicable OPs, namely NAS-21 Novacor, CTE-Richardson, Zeonex E48R, Optorez 1330 and Bayer for wavelengths from 435.8 to 1052 nm. A theoretical examination was made for computer modelling of OPs indices using Cauchy's dispersion formula. The dispersion coefficients and Abbe constants are calculated. The OPs indices computed for numerous laser wavelengths 442–1060 nm are presented. A more effective device and technology for the measurement of refractive index of OPs is realized with an accuracy of ±0.001.     

光学塑料元件低压注射成型技术的应用

光学塑料元件低压注射成型技术是相对于传统注射技术的一大改进。它包括压缩注射成型、低压高速成型、注入气体注射成型和降低模内压力成型。它的主要优点是降低压力、降低能源消耗、降低成本、提高工效、提高光学塑料元件质量。这对于我国光学塑料非球面的开发极有好处     

Three-dimensional pictures of industrial scenes applying an optical radar

For small scale ranging, a light beam, modulated with a wavelength typical for radio waves, is a suitable means of scanning. The ranging beam can be focussed to illuminate only a small spot. The diffuse reflection on the spot ensures that an echo appears. By applying phase comparison techniques to the ranging and echo beam the optical path length and thus the height of the illuminated surface element can be determined. By systematically deflecting the beam and thereby scanning the scene, a discrete height map is obtained. The realisation of such a small scale ‘optical radar’ is described, the main elements of which are a semiconductor diode laser for emission, an avalanche photo diode for detection, and a two-dimensional beam deflection mechanics for scanning. The typical performance is taking a picture of a volume of about 0·5 m × 0·5 m × 0·5 m within 1s, consisting of about 64 000 pixels.     

The early-stage diagnosis of albinic embryos by applying optical coherence tomography

Albinism is a kind of congenital disease of abnormal metabolism. Poecilia reticulata (guppy fish) is chosen as the model to study the development of albinic embryos as it is albinic, ovoviviparous and with short life period. This study proposed an imaging method for penetrative embryo investigation using optical coherence tomography. By imaging through guppy mother’s reproduction purse, we found the embryo’s eyes were the early-developed albinism features. As human’s ocular albinism typically appear at about four weeks old, it is the time to determine if an embryo will grow into an albino.     

利用全息法在偶氮聚合物薄膜中记录涡旋光场

利用全息技术在偶氮聚合物薄膜中记录了拓扑荷数q=–1,1,2,4的涡旋光场,并将记录的原始叉形光栅与计算全息光栅进行对比,对不同拓扑荷数涡旋光的记录速率和偶氮材料的可重复擦写性能进行了测试;记录完成后,将复现涡旋光与高斯光束干涉,并与原始涡旋光和原始叉形光栅对比,分析了记录质量.实验结果表明:高阶涡旋光场的全息叉形光栅...     

A supersymmetric Vista for quantum cosmology

A brief overview on the subject of Supersymmetric Quantum Cosmology (SQC) is presented here. Different approaches are described, all of them being inspired by the search of a square root of (quantum) General Relativity. Some new ideas in the form of a list of (still!) open problems and an extensive bibliography are included.