Orthogonally linear polarized lasers(Ⅰ)--principle and devices

Two kinds of orthogonally polarized lasers, i.e. Zeeman dual-frequency lasers and four-frequency ring lasers (laser gyros) have been developed since the invention of lasers, in which circularly polarized lights oscillate. This paper summarizes recent progress of the study on orthogonally linear polarized lasers with the standing wave cavity. Firstly, the expression of producing orthogonally linear polarized lights in standing wave cavity, i.e. laser frequency splitting, is given. Almost all the birefringence effects made in laser cavity are used to produce orthogonally linear polarized lights. The effect includes quartz crystal birefringence effect, calcite birefringence effect,stress (photo-elastic) birefringence effect and electro-optical birefringence effect. Secondly, several physical phenomena of orthogonally linear polarized lasers are discovered such as aberrance of frequency splitting curves caused by optical activity of quartz crystal, order-passing of longitudinal modes with frequency splitting and strong modes competition. Finally, because the traditional Zeeman dual frequency laser cannot output frequency difference larger than 3 MHz, the approaches of obtaining larger frequency difference are studied. The sequential results, several kinds of orthogonally polarized lasers, are described, such as birefringence dual frequency lasers outputting a frequency difference from 40 MHz to hundreds of megahertz, birefringence-Zeeman dual frequency lasers outputting a frequency difference from 1 MHz to hundreds of megahertz, the LD pumped YAG birefringence dual frequency laser outputting frequency difference of several gigahertz, and the lasers whose longitudinal mode spacing is c/4L instead of c/2L.     

半导体单晶硅的离子束蚀刻实验研究

离子束蚀刻是一种有超精细加工能力的微细加工技术,广泛应用于微电子、光子技术、表面科学等领域。硅及其化合物常用来制作大规模集成电路,在其表面蚀刻出具有一定几何布图尺寸的沟槽。其深度、宽度、边壁倾角及槽底形状等直接影响器件的性能。     

药物学领域的电子束辐射技术——一种新型抗结核制剂

为了根除疾病,药物学研究的重点已经从单纯的药物化学领域扩展到化学、生物学、电子学等多学科结合领域.本文介绍了俄罗斯科研人员运用电子束加速器固定技术研制的新型抗结核药物制剂,该制剂改善了原有的抗结核药物的内涵,加强了药物制剂中生物活性物质的作用.     

MeV Pb离子在非晶Si中的射程离散──离子束混合和增强扩散的影响

１．０ＭｅＶ２０８Ｐｂ离子在非晶Ｓｉ中的投影射程ＲＰ和射程偏差ΔＲＰ作为注量和温度二者的函数用背散射法进行测定．注量的变化范围为５×１０１３～７×１０１４ｃｍ－２．注入是在室温和ｔ＝－１２０℃下完成的．由由实验所确定的投影射程，射程偏差与注量或温度无关，并且分别等于２９５和７２．２ｎｍ．与ＴＲＩＭ８６的计算结果相比较，发现ＲＰ的偏离为１８％，而ΔＲＰ的偏离为３６％．ＲＰ和ΔＲＰ二者与注量及温度的无关性，排除了所观察到的与ＴＲＩＭ的矛盾是由于注入期间辐射增强扩散或离子束混合效应而引起的解释。     

异种钢焊接接头过渡层影响因素的研究

本文根据回归正交优化法原理,用电孤焊试验研究了异种钢焊接接头过渡层的影响因素。通过实测与计算,获得过渡层为零时,最佳匹配的焊接规范参数,为消除过渡层的有害影响探讨了新的途径。     

一种在主瓣干扰条件下稳健的自适应波束形成方法

在自适应波束形成技术抑制干扰问题中 ,当存在主瓣干扰时 ,便暴露出两个缺陷 :一是副瓣电平增高 ;二是主波束变形且峰值偏移。提出了一种先在数据域实施干扰相消预处理 ,再进行自适应波束形成的解决方法 ,该方法在抑制主瓣干扰的同时 ,有效地解决了副瓣电平增高、主波束变形及偏移的难题。仿真结果证明了该方法的有效性。     

半导体激光器行波速率方程的研究

考虑了ＩｎＧａＡｓＰ半导体激光器的俄歇效应后，对描述稳态运行的半导体激光器的行波速率方程组进行了修正，求得了隐函形式的解析解，并以此对激光器的一些重要持性进行了讨论。     

激光开槽、埋槽电极硅太阳电池

报道一种新颖的激光开槽、埋槽电极硅太阳电池的结构、工艺流程及其研制结果。在ＡＭ１．５，２５℃，１００ｍＷ／ｃｍ２的条件下，以面积为４５ｃｍ３的３６片硅片研制的硅太阳电池的输出参数的平均值为ＪＳＣ＝３６．１ｍＡ／ｃｍ２，Ｖ∞＝６３３ｍＶ，Ｆ．Ｆ．＝０．７９８，η＝１８．２３％，最后分析了种高性能硅太阳电池的设计特点。     

碗扣式多功能脚手架CO2气体保护自动焊机

采用CO2气体保护焊工艺研制了碗扣式多功能脚手架CO2气体保护自动焊接设备，在零部件尺寸不规范的条件下，利用电、气动机构实现多个工件的同时准确自动装卡及自动焊接，焊缝成形好，质量稳定，提高了生产效率，节约了能源及4／5的劳动力。     

The Nature of Light and Twentieth Century Experimental Physics

In the popular literature of physics the electromagnetic field isoften treated as though it has an intrinsic particle nature. When thetheory is examined carefully, quantum theory only makes the weakerrequirement that the emission and absorption of light are restricted todiscrete amounts of energy. There are very few realizable experiments inoptics for which the classical Maxwell theory and the quantum theorymake a different prediction. I discuss some of these experiments with anemphasis on the distinction between what the experiments tell us aboutthe measurement process, and what they tell us about the nature of thelight field.