查询词典 gratings

A grating function and a groove function are introduced to determine the structure of a concave grating. Basic ideas for the design of a flat-field concave grating with three stigmatic points are proposed. As a proof of the usefulness of these design approaches, image conditions of the grating with three stigmatic points are developed which concise with other published results and they are more general than those obtained from holographic gratings.

采用与分析三维光栅相类似的级数展开法给出了二维集成凹面光栅的球差、彗差的计算方法，计算中用光栅函数和槽面函数来描述具有任意形状和任意变化周期的光栅，提出了一种具有三个无像差点的平面场型凹面光栅的设计方法，利用该方法推导了三点无像差光栅的成像条件，与文献中用其它方法获得的结果相一致，该结果与全息光栅的成像条件相比，更具一般性。

The fabrication of transmission gratings with the grating constant of 2.5μm and 5μm is studied in ZK6 and LaF2 glasses at the machining speed of 400μm/s by using femtoscond laser with the peak intensity of 2.7×10~(13)W/cm~2, and the diffraction patterns of the grating are presented with a semiconductors laser at 650 nm.

在加工速度为400μm/s、激光的峰值功率密度为2.7×10~(13)W/cm~2时，在ZK6玻璃和LaF2玻璃内制备出光栅常数为2.5μm和5μm的透射式衍射光栅，并在650nm的半导体激光照射下获得了光栅的衍射图样。

Beginning with wave equation, the paper has deduced the propagation of gauss pulses in single mode fiber and fiber grating transmission compensation. The characteristics of cascaded phase-shift gratings are discussed by numerical simulations of coupled-mode theory and T-matrix method. The experimental works and measurement results are shown in this paper. On the other hand, we have introduced the basic theory of EDFA and figured out the characteristics for EDFA at different conditions by numerical simulation. Some experimental results for EDFA are also presented here. In this article, you can find the influence on Optical Fiber Amplifier by Gain Tilt, especially, the negative effect on CSO in CATV transmission system.

论文首先从波动方程入手，对高斯脉冲在单模光纤中的传播演化及光纤光栅透射补偿进行了详细的研究；较系统地介绍了光纤光栅的耦合模理论，并将传输矩阵计算法用于计算级连相移光纤光栅的光学特性；重点介绍了作者在光纤光栅刻制及特性测量方面所做的一些实验研究工作；较系统介绍了EDFA的基本理论，计算出各种条件下EDFA的光学特性，并进行了一些实验研究；综合分析光纤放大器对光纤传输系统的影响，特别分析了光纤放大器增益不平坦对光纤CATV系统中CSO恶化的原因及其解决方法，并研究了光纤布拉格光栅在稳定980nm泵浦源输出功率和输出波长方面的应用；结合一个基于光纤光栅和光纤放大器的光纤用户接入网方案，对光纤用户接入网的若干问题进行了理论与初步的实验研究。

The method is applied to study the diffraction characteristics of dielectric gratings with rectangular and trapezoid shapes.

给出了光栅单元截面为矩形和梯形的算例。

High and low ventilators covered internally with double fine brass wire gauze of nominal aperture size not greater than 0.65mm and externally with non-corrodible metal gratings/louvers to be provided to the store.

该仓须具备高低通风气窗，窗内安装双层幼铜线网，网眼不得超逾0.65毫米，窗外则安装抗腐蚀铁枝格栅或百叶窗板。

This dissertation concentrates on the application of symmetry in the design of Dammann gratings for controlling of the zero order's intensity and higher order's intensities.

本论文将镜像对称结构引入达曼光栅，设计出反转对称型达曼光栅，并对多值位相达曼光栅进行了理论设计，其主要内容如下： 1。

The indicator element (2) is designed as a waveguide panel, wherein light beams propagate with total reflection and get outcoupled therefrom with a diffractive outcoupling system (2u), such as a grating structure or the like, which is configured as an indicator pattern, for producing an indicator pattern (2a) activable in the indicator element (2) by the action of light, such that divergent recesses and/or grooves of various sizes and/or shapes constitute divergent local gratings of various sizes and/or shapes, such as multi-shaped and/or binary pixels and/or units, the filling factor, shape, profile and/or size thereof being optimized in such a way that the diffraction efficiency is a function of place.

把指示元件(2)设计成波导板，其中光束以全反射方式传播并且从那里通过构造成指示图案的衍射外耦合系统(2u)、如光栅结构等得到外耦合，用于在指示元件(2)中产生可由光作用激活的指示图案(2a)，使得各种尺寸和/或形状的分散的凹口和/或槽纹构成各种尺寸和/或形状的发散的局部光栅、诸如多形状的和/或二元像素和/或单像素的，所述局部光栅的填充系数、形状、轮廓和/或尺寸可以以这样的方式优化，使得衍射效率是位置的函数。

The strain gradient, the fiber Bragg grating's reflection and the short wavelength loss decide the two stopbands. Because of having no extra loss result from coupler and no high cost result from circuitor, the band pass filter formed by single chirped fiber grating have many good characters such as little insert loss its insert loss is the fiber splice loss, small volume, low cost and excellent property, moreover there is no report about fabricating filter by using this method, thus we will apply national invent paten about the method of fabrication fiber band pass filter using single chirped fiber grating. According to the parameters linearly chirped fiber gratings of Canada BRAGG Photonics Inc.

由于没有耦合器带来的3dB的额外损耗，也没有环行器带来的高的制作成本，用单支chirped光纤光栅形成可调光纤带通滤波器具有插入损耗极小（插入损耗为光纤与光纤之间的融接损耗）、体积小、制作成本低廉并且性能优良等特点，而且国内外还未见类似制作方法的报道，我们对用单支chirped光纤光栅形成可调光纤带通滤波器这一制作方法正在申请国家发明专利。

We employ the rigorous vector coupled-wave theory to analyze the electromagnetic diffraction nature of two-dimensional columned grid gratings.

通过计算机计算和模拟分析，我们给出了圆柱形网格光栅的抗反射特性与光栅参数和入射光波参数之间的关系。

We found that the recording order of gratings with different periodicity made a crucial effect on the final forming of the microstructures. 4. Photo-induced birefringence phenomenons of P , containing mono azobenzene chromophore and P (MMA-co-GY7), containing diazobenzene chromophore were studied by static absorption and dynamic pump-probe techniques.

研究了单偶氮苯聚合物P、双偶氮苯聚合物P（MMA-co-GY7）的紫外-可见吸收光谱、荧光光谱，并对单偶氮苯、双偶氮苯聚合物材料光谱性能的差异进行了分析；研究了偶氮苯聚合物的超快光致双折射过程，并对单偶氮苯聚合物与双偶氮苯聚合物进行了比较，分析了含双偶氮聚合物超快光致双折射过程的来源。

If you are unfortunate enough to the lovelorn, please tell me, I will help you out, really, please contact me!

如果你不幸失恋了，请告诉我，我会帮助你摆脱困境，真的，请联系我啦！

China's plan to cut energy intensity by 20 percent and pollutant discharges by 10 percent between 2006 and 2010 is a case in point.

中国计划在2006年到2010间降低20%的能源强度和减少10%的主要污染物排放，就是一个这样的例子。