掺镱双包层高功率光纤激光器输出特性研究

对线形腔掺镱双包层高功率光纤激光器的输出特性进行了研究 ,通过求解速率方程 ,得到了激光器泵浦阈值功率、输出光功率和斜率效率的表达式。分析了光纤长度、腔镜反射率和泵浦波长等因素对激光器阈值功率、输出光功率和斜率效率的影响 ,为高功率光纤激光器的优化设计提供了理论依据     

连续激光引起高空中动态靶材破坏的理论计算

本文在文献[1]和[2]的基础上,考虑动态靶目标是受载结构的影响,综合考虑大气吸收、散射、湍流及热畸变效应对激光传输的影响,计算了连续激光引起高空中动态靶目标的破坏阈值。     

耦合腔激光器的波长调谐与频率调制特性分析

考虑用激光器与调制器直接耦合以及耦合槽的影响，用散射矩阵法及二步等效反射率法，对沟槽耦合腔激光器的波长调谐和频率调制特性的分析表明，数学处理简单，物理图像清晰。     

色心激光器及其发展

色心激光器由于其特殊的调谐范围及单频、窄线宽的工作特点,可作为高分辨率的分光仪的理想窄带光源而用于分子振动一转动跃迁的研究,在光纤通信、超高速现象的研究等方面也有其独特的应用。本文叙述色心的构造及其特点,色心激光器的泵浦及泵浦的最佳化,调谐方式及新调谐范围的进展,单频、窄线宽运行的实现、激光脉冲的压缩等。最后指出色心激光器的发展方向和可能的应用。     

Polarisation behaviour of diode lasers with frequency selective feedback

The paper reviews recent results obtained with diode lasers used in external hybrid cavities with frequency selective feedback. Such cavities attract continuing interest for several reasons. They generate a tunable single laser mode with very low linewidths (usually a few tens of kilohertz). Very wide discrete tunable ranges over 100 nm for Fabry-Perot type and over 200 nm for quantum well lasers are achieved. They can be made to oscillate in a tunable mode having the desired polarization state,TE orTM and, in some cases, simultaneously atTE andTM. This is done by designing a cavity that increases strongly theTM/TE intensity ratio and by using coatings on one laser facet that greatly lower bothTE andTM reflectivities. High-speed polarization switching in the gigahertz range is possible by inserting passive or active polarization selecting elements in the cavity. For all these reasons hybrid external cavities are attractive for applications in optical metrology, spectroscopy and optical communications. Moreover, the external cavity configuration allows the study of physical mechanisms in the laser diode by inducing on purpose phenomena that would have been otherwise impossible to achieve with free-running lasers.     

半导体耦合腔激光器的波长调谐与频率调制特性分析

本文将激光射器与调制器的直接耦合和耦合槽的影响综合考虑，用散射矩阵法及两步等效反射率法，对沟槽耦合腔激光器的波长调谐和频率调制特性进行了分析，数学处理简单，物理图象清晰。     

利用线阵CCD实现宽波段、大视场短脉冲激光波长的远场测量

介绍了一种利用线阵ＣＣＤ实现宽波段、大视场脉冲激光波长及方向远场测量的原理和实验装置；对强烈背景下激光信号的提取与处理方法进行了理论分析和实验研究，给出了系统信噪比与探测器件工作频率的理论公式；最后简要介绍了远场实验和测试结果     

高功率固体激光器

本文详细讨论了设计高平均功率固体激光器的有关问题,包括激光材料性质、棒状和板条状几何结构,聚光器和光学谐振腔等。分析表明,板条状几何结构固体激光器提供了达到千瓦级功率水平同时又保持良好光束质量的可能性。     

The growth of roughness during electrodeposition

Measurements of the growth rate of roughness on a cathode surface can be used to study the physics of cathodic processes. But these growth rates are cell wide variables and they ordinarily depend on what is taking place at the anode as well as at the cathode. Our aim is to derive a simple condition under which the anode makes no contribution to the interpretation of growth rate measurements at the cathode.Our condition stems from the contribution of ion diffusion to the growth rate and it is satisfied for all non-small values of the wave number of a growing disturbance. This, together with the fact that surface tension is the only stabilizing factor and the fact that the surface tension coefficient multiplying the wave number is small, means that the anode ought not to be important for the fastest growing wave numbers.Once the effect of the anode is eliminated, the growth rate at the cathode can be expressed in a formula so simple that pencil and paper calculations are possible and this makes important questions in cell design easy to answer, e.g., is the growth rate diffusion controlled?     

Virtual Fiber Configuration for Dynamic Lightpath Establishment in Large-scaled Optical Networks

Recently, progress has been made in the Generalized Multi-Protocol Label Switching (GMPLS) and Automatic Switched Optical Networks (ASON) standardizations. These technologies realize construction of large-scaled optical networks, interconnections among single-domain Wavelength Division Multiplexing (WDM) networks, and direct communication over multi-domain WDM networks. Meanwhile, it is known that the topology of the Internet exhibits the power-law attribute. Since the topology of the Internet, which is constructed by interconnecting ASs, exhibits the power-law, there is a possibility that large-scale WDM networks, which are constructed by interconnecting WDM networks, will also exhibit the power-law attribute. One of the structural properties of a topology that adheres to the power-law is that most nodes have just a few links, although some have a tremendous number of them. Another property is that the average distance between nodes is smaller than in a mesh-like network. A natural question is how such a structural property performs in WDM networks. In this paper, we first investigate the property of the power-law attribute of physical topologies for WDM networks. We compare the performance of WDM networks with mesh-like and power-law topologies, and show that links connected to high-degree nodes are bottlenecks in power-law topologies. To relax this, we introduce a concept of virtual fiber, which consists of two or more fibers, and propose its configuration method to utilize wavelength resources more effectively. We compare performances of power-law networks with and without our method by computer simulations. The results show that our method reduces the blocking probabilities by more than one order of magnitude.