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In this paper, principle and technique of volume holographic storage are presented such as volume grating formation, Bragg diffraction, and horizontal angle selectivity.

本论文介绍了体全息存储原理及技术，包括体光栅的形成和布拉格衍射、衍射效率、水平角度选择性，还介绍了相干光学信息处理系统、Vander Lugt 滤波器的形成过程，给出了多重匹配滤波器相关的运算过程，最后介绍了子波变换的定义以及光学子波变换。

The relationship between the changes of radio-frequency signal frequency and Bragg diffraction angle is analyzed, spatial filtering characteristic resulted from acousto-optic deflection effects is discussed.

实验表明，采用波长为630 nm的单频激光，带宽为200 MHz的声光偏转器，其频率分辨率优于1 MHz，频率信号的空间分离效果明显，接收灵敏度和信噪比得到改善。

We have also included Bragg diffraction in this chapter.

这一章还包括布喇格衍射。

And then based on the theory of the interaction of acoustic wave and optic wave, the Raman-Nath and Bragg diffraction are introduced in detail, of which theoretical model is given.

紧接着从声光调制的原理入手，详细的介绍了拉曼-纳斯衍射和布拉格衍射这两种基本的声光作用并给出其理论模型。

Birefractive index and Bragg diffraction have been oboserved and measured in the crystals.

测量和研究了晶体的双折射率和布喇格衍射。

The treatment of Bragg diffraction by the method of coupled wave phenomena, which will be discussed in a different context in later chapters.

本章最后一节介绍用耦合波法分析布喇格衍射，这是耦合波现象的一个例子。关于耦合波问题将在后面几章讨论。

The anisotropic Bragg diffraction properties of volume gratings in photorefractive crystals were investigated by the method of the couple wave theory.

利用耦合波理论分析了光折变晶体中体光栅的各向异性衍射性能，研究了在不同初始记录光强比的条件下，记录光入射角的改变对光折变体光栅各向异性布喇格衍射性能的影响。

We introduce the acousto-optic interaction physics, the Bragg diffraction, the optical and acoustic characters of the acousto-optic interaction crystal.

声光可调滤波器是依赖于反常声光布拉格衍射工作的声光器件。

Wu Baojian. Analysis of phase mismatching in magneto-optic Bragg diffraction.

武保剑。磁光Bragg衍射中的相位失配分析。

Fully regarded the piezoelectric effect, the electrooptic effect caused by the applied electric field and based on the equation of diffraction efficiency and Bragg condition, the of between the applied electric field, the writing beam ratio with respect to the writing angles are analyzed.

全面考虑了电场作用下晶体的压电和电光效应，基于衍射效率公式和光栅的布拉格条件，给出了为获得最佳衍射效率比时外加电场及写入光束比与记录角度间的关系曲线。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。