宽带声光布拉格器件及应用

宽带声光布拉格器件是一大类发展迅速的新型器件,以它为基础的声光信号处理技术包括声光频谱分析技术和声光相关处理技术.目前把宽带声光布拉格器件应用于无线电信号的侦察、检测是电子对抗中信号处理的一个新方向,它具有处理瞬时大带宽信号和检测分析复杂信号的能力,在雷达、通信、电子对抗和无线电天文学等领域具有广泛的应用前景.介绍了它的基本原理、设计,进行了中心频率从300～400 MHz的宽带声光布拉格器件制作,测试的器件工作带宽达到180～260MHz,同时利用两个器件开展了信号实时检测和微弱信号提取试验.     

第五讲 基础声光器件

在前面四讲里,我们较详细地讲述了声光互作用的基本理论和选择声光材料的基本原则,这是声光应用技术的基础.利用声光互作用效应可研制出各种声光器件,其中最基本的是声光调制器、声光偏转器和声光可调滤光器等.利用这些器件可构成各种时间和空间信号处理系统,因此,我们把这些器件称为基础声光器件.因篇幅所限,在这一讲     

第六讲 声光器件的应用

在前面五讲里,我们系统地讲述了声光学的基本理论、声光材料及基础声光器件等.在本讲座的最后一讲——第六讲,我们将向读者介绍声光器件的主要应用领域.近十多年来,声光技术发展很快,声光器件在许多领域里得到了重要的应用,并显示出其优越性,展现出广阔的应用前景,引起人们极大的关注.因篇幅关系,这里只着重介绍声光器件在信号处理、光计算和激光技术及光通信等领域中的应用.一、声光器件在信号处理中的应用随着微电子技术的发展,使现代化战争的战场变成一个多维的实体战场,在其间无真空地带可言,高密度的大瞬时带宽电子战信号充斥其间.这就是说,在现代战争的战场上,敌对双方的胜负在很大程度上取决于     

超声横焊法制声光器件及性能

前言第一篇报告谈到,声光介质和压电体的焊接,是影响声光器件性能的重要因素,提出了一种新的超声纵焊法,并详细谈到了用这种方法制作声光调制器的方法。本文介绍又一种新的超声横焊法,以及用这种新方法制作声光器件、偏转器件的技术及其性能。与第一篇报告相比,纵焊法是使超声与压电体和声光介质的焊接面垂直振动,平行     

导波结构的声光互作用与声光器件(一)

在各种固体介质中,光波与声波的相互作用,随着激光的问世与高频超声技术的发展,十几年来已为人们广泛地研究.许多实用的体波结构的声光器件(声光调制和声光偏转器等)也已研制成功.由于集成光学的发展,从1970年Kuhn等人第一次报导了导波结构的声光衍射实验以来,关于导波结构的声光互作用和声光器件的研究越来越多.这种新型的声光器件,由于光导波的导波特性使其与体波结构的器件相比,具有功率密度大、声光互作用的长度较长以及导波的色散可以控制等优点,在制作工艺上,这种器件采用薄膜平面工艺,可以制成小型化,并有利于成批生产.因而,导波结构的声光器件,在集成光学中可以作为一种有效的控制光束(光调制、光开关和光偏转)的元件.     

声光技术在计算机设备中的应用

具有良好性能的各类声光器件,如调制器、扫描器、偏转器、滤光器等已分别在新闻传真、激光印刷、信息记录和处理以及激光腔内使用方面获得了巩固的地位.而今,声光技术和计算机技术的结合越来越密切.用声光记录取代现有的机械式打印机不仅使输出速度提高一个数量级以上,而且在可靠性、寿命、噪声方面均比机械式打印机好且成本低廉.将声光器件和现代精巧的微型计算机组合,还可实现许多独特的功能,电控快速调谐光谱计便是一例.可以预计,随着科学技术的飞速发展,声光技术在计算机设备中日益获得广泛地应用,必将产生一代新的设备与仪表.本刊安排的这次声光技术讲座,着重介绍了声光器件在计算机设备中的应用.以使读者对声光技术的发展动向有一概括的了解.     

光外调制——全光纤声光调制器的研制(下)

4 全光纤声光器件的研制 结合光纤声光互作用理论,我们设计了一种可拆除的全光纤声光器件——表面波声光器件。将声     

声光技术在电子战中的作用与地位

本文介绍了声光技术特别是以高频声光偏转器件制作的频谱分析仪在电子战中的作用与地位。     

波导型集成声光器件的研究进展

集成声光器件作为波分复用网络中关键的无源器件,能够实现开关、滤波、调制等功能.声光器件由于其固有的高速度、宽频带和可能多波长同时工作的特点而成为研究重点.文章对已有的集成声光器件进行了分类,简要介绍了波导型集成声光器件的工作原理和发展状况,比较了当前研究广泛的两大类波导型集成声光器件的优缺点,指出了目前需要解决的重要课题及其发展趋势.     

四川压电与声光技术研究所光纤传感器概况

四川压电与声光技术研究所是机械电子工业部中国电子工业总公司所属的压电与声光技术的专业研究所。从1972年开始筹建声光技术研究室,经过近20年的创业和发展,目前已拥有一支从事光学材料、声光器件、光纤传感器、电子线路、导波光学、薄膜光学、光电测量、光学加工等门类齐全,自成体系的科技队伍。     

预（光）刻伺服录写装置中基于计算机控制的激光声光调制系统

预（光）刻伺服录写装置是我们正在开发的用于提高硬盘存储器容量的一种高技术设备。论述了该装置所使用的激光声光调制系统，提出并实现了基于计算机控制的，采用单一声光调制器在该装置上进行光功率稳定、光强控制及光脉冲控制的系统，给出了一种有效的数字滤波算法。     

Cascaded acoustooptic/fiber Fabry-Perot filter with finesse over2000

A compound optical filter consisting of an integrated acoustooptic filter in series with a fiber Fabry-Perot filter possesses a very high effective finesse of over 2000 as well as the unique multichannel passband capability of the acoustooptic filter. The fine-grain element in this pair is a narrow (0.5-Å) passband Fabry-Perot filter, and the coarse-grain element is a wide tuning range (130-nm) polarization-independent integrated acoustooptic filter. The composite device has the narrow passband of the Fabry-Perot, the wide tuning range of the acoustooptic filter and the tuning speed of the faster acoustooptic filter (5 μs)     

声光调制器与电子分色扫描机

本文简要分析了在电子分色扫描机中,利用声光调制器作为电光转换器件的优点,并指出在实际应用中,国产声光调制器和驱动器源完全可以替代进口的同类产品。最后。介绍了四种采用声光调制器的记录系统。     

Acoustooptic signal processing and computing

Acoustooptic techniques have been used to perform computationally intensive signal processing operations and form subsystems of larger signal processing systems. Key aspects of acoustooptic devices and of the range of possible signal processing applications, including the advantages of acoustooptic implementation, are reviewed. Developments that improve acoustooptic device performance, increase system dynamic range such as by reduction of optical crosstalk from optical scatter and wavefront error, and implement data reduction operations that allow easier interfacing into a larger signal processing/computation system are described     

Design of high-frequency ZnO-coated optical fiber acoustoopticphase modulators

In this paper, we present a theory of an optical fiber acoustooptic phase modulator using piezoelectric zinc oxide (ZnO) coating. The effects of changing device parameters in the acoustooptic resonator are investigated for transducer design. These results are entirely different from those of the well-known; planar device structure since every part plays an important role in the resonator structure. Optical phase modulation in the frequency region up to 1 GHz is also demonstrated. Multiple sharp resonance peaks with a maximum phase shift of 0.7 radians are observed     

Tunable acoustooptic reflection filters in LiNbO3without a Doppler shift

A proposal is presented for an acoustooptic filter in LiNbO₃ without the Doppler shift, which is normally present in acoustooptic filters and which is undesirable as an intracavity element. This tunable filter has a significantly wider tuning range than previously demonstrated electrooptic filters. A structure incorporating an interdigital acoustic transducer, polarization filter, and single-mode optical waveguide is shown. The design presented works by cascading two acoustooptic filters with an intermediate polarizer, where the Doppler shift experienced in the first filter is precisely compensated for in the second filter. Hence, the output light of the two cascaded acoustooptic filters is not shifted in frequency, thus making the device suitable for applications inside a laser cavity. The filter with intermediate polarizer can be integrated with a single-mode waveguide and requires only a single interdigital acoustic transducer. Crystal symmetry and acoustic power considerations are treated in detail     

使用一个双通道器件的声光相关器及其设计方法

介绍了一种仅使用一个双反向通道式声光器件的声光相关器，从正常布喇格衍射和反常布喇格衍射两方面，讨论了这种器件的设计方法。     

Wide-band guided-wave acoustooptic Bragg diffraction and devices using multiple tilted surface acoustic waves

Guided-wave acoustooptic Bragg diffraction from a single surface acoustic wave (SAW) and from two tilted SAW's has been analyzed to establish the design parameters of the related devices. Design and performance figures of the devices involving three and four tilted SAW's in single-mode Y-cut LiNbO3out-diffused waveguides are described in detail. Device bandwidth of up to 358 MHz, an optical throughput coupling efficiency of up to 25 percent, and very good optical beam quality have been realized. A bandwidth of 358 MHz enables the device to deflect a light beam of 1-cm aperture into 1000 resolvable spot diameters with a random-access switching time of 2.8 µs. A total electric drive power of 220 mW was required to diffract 50 percent of the incident light power for the unit with 245-MHz bandwidth. The development of this wide-band technique has paved the way for using such guided-wave acoustooptic devices in a number of applications in addition to those common to bulk-type acoustooptic devices.     

Integrated-optic acoustically-tunable filters for WDM networks

The background needed to understand the integrated-optic collinear acoustically tunable optical filters (ATOFs) and the fabrication and performance of both simple and multielement acoustooptic tunable filters is presented. The most important sources of crosstalk between channels simultaneously selected by a single device are discussed. ATOFs have the combined virtues of narrow passband (subnanometer bandwidth), broad tuning range (hundreds of nanometers have been demonstrated), and simultaneous independent multiple-channel filtering. The theory and practice of collinear integrated optic acoustooptic filters is presented. Devices which involve higher-order integration are discussed, including multiple-state filters for enhanced sidelobe suppression and polarization-independent configurations. Various sources of interchannel crosstalk are derived and demonstrated in multiwavelength filtering experiments     

声光器件的动态特性及其对激光测速的影响

在光电混合反馈激光测速系统(OEHF—LDA)和声光扫描激光测速系统(AOS—LDA)中，起光学频移作用的声光调制器和控制测量位置的声光偏转器均处于变频工作模式，因此声光器件的动态特性对系统的性能具有重要的影响。该文从理论分析、数值计算和实验研究入手，具体讨论了声光器件的动态响应特性，它可用具有纯滞后的一阶非周期环节来表征，并深入分析了声光器件的滞后特性对变频光学频移LDA系统的影响，最后提出了对变频声光器件调节的基本要求。