共查询到18条相似文献,搜索用时 125 毫秒
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描述了用He-Ne激光声的声光器件进行的声光调制和声光偏转实验。调制曲线上有一个拐点,在拐点附近的一段曲线可看成直线,利用这段曲线进行调制可减少失真。 相似文献
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多频声光互作用的研究 总被引:1,自引:1,他引:0
本文推导出包括正常和反常声光互作用在内的多频声光耦合波方程的普适形式,并得出两个独立超声波信号时布拉格状态下方程的解.分析了多频声光互作用的各种线性和非线性效应,包括衍射效率、压缩、交叉调制和各级互调制强度等,并指出反常与正常多频声光衍射的差异.结论是反常多频声光互作用情况下,各级互调制模强度与主衍射模强度的比值小于正常多频声光互作用情况下的相应比值.实验结果与理论分析相符. 相似文献
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一、教学用声光实验装置正式投产 由国家海洋局海洋技术研究所研制的教学用YZY3-1 型声光调制器已有偿转让给辽宁阜新市测试仪器厂.1985年6月30日,在厂家召开了市级产品定型鉴定会,现已正式投产.该产品包括三部分:固体声光器件、可供研究液体介质的声光波及电驱动部分.与目前大学实验室通用仪器配套,可完成包括光通讯、声速测量等20个现代声光学实验、该产品并备有《声光原理及其实验》一书,该书共约15万字. 二、利用声光调制器的调制型激光针灸机 相似文献
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用线阵CCD代替可移动的光电二极管,改进了声光调制实验。将声光调制的入射光和衍射光投射在线阵CCD上,线阵CCD的信号输出由数字示波器显示,利用数字示波器的"光标"功能测出光斑的距离。改进后,使测量变得简单快捷,提高了实验效率,并减小了实验测量误差。 相似文献
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射频调制的脉冲激光是激光雷达探测领域内的一项重要研究内容.根据声光斩波器的强度和频率调制特性,设计了基于频移反馈腔的全光纤射频调制脉冲激光.理论上,建立了基于频移反馈腔的激光外差相干理论模型,并进行了数值仿真.根据理论模型,实验上严格控制频移反馈腔的长度和声光斩波器触发信号的周期,在100 MHz的射频信号驱动下,产生了脉冲宽度110 ns、重复频率约20 kHz的具有最高700 MHz射频调制的脉冲激光(脉内调制激光);同时微调斩波周期可以实现脉冲前沿或后沿的多样性射频调制.通过改变反馈腔内光纤放大器的输出功率实现了射频调制深度的连续可调,最高达到了0.67. 相似文献
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分析了声光效应的基本原理及布拉格效应成立的条件,构建了声光器件特性测试实验装置。对声光器件中布拉格衍射的建立、声光调制的幅度特性及频率特性等基本特性进行了测量分析,对声光模拟信号传输的线性特性和音频频响关系进行了研究。 相似文献
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本文提出了一种基于光纤叠栅的全光纤声光可调谐滤波器, 与普通光纤布拉格光栅型全光纤声光可调谐滤波器相比, 该滤波器能够对光纤叠栅的两个中心波长进行同步调制. 理论分析了声波频率和声致应变幅度对基于光纤叠栅的全光纤声光可调谐滤波器的传输光谱的影响, 结果表明, 各阶次反射峰分别以两个主反射峰为中心呈对称关系, 且主反射峰与其所调制出的次反射峰之间的波长间隔与声波频率成正比, 而两个主反射峰所调制出的同阶次反射峰之间的波长间隔与声波频率无关; 声致应变幅度主要影响主反射峰及次反射峰的反射率的变化. 实验中, 分别测试声波频率为390 kHz和710 kHz的基于光纤叠栅的全光纤声光可调谐滤波器的传输光谱, 实验结果的变化趋势与仿真分析结果相一致. 相似文献
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In this paper,based on the behavior of acousto-optic modulator,we have anal-ysed the instability of an intracavity acousto-optic modulation(IAOM)laser system with afeedback device.The bifurcation and chaos behavior of the system is discussed in detail to ob-tain some quantitative results. 相似文献
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ZENG ShaoQun LUO QingMing LI DeRong & Lü XiaoHua Britton Chance Center for Biomedical Photonics Wuhan National Laboratory for Optoelectronics Huazhong University of Science Technology Wuhan China 《中国科学G辑(英文版)》2009,52(5):685-692
Acousto-optic modulation of the femtosecond laser beam has wide potential in various fields such as microscopic imaging, micromachining
and optical storage because of its rapidity, high accuracy and good repeatability. This paper reviews the latest research
on acousto-optic modulation of femtosecond laser, describes the effects of spatial and temporal dispersion of such lasers
after acousto-optic modulation, introduces the theoretical outcomes on pulse width evolution of the Gaussian laser pulses
after acousto-optic modulation, discusses the characteristics of contemporary dispersion-compensating techniques for the acousto-optic
modulation of femtosecond laser, and finally refers to the challenges of this technique.
Supported by the National Natural Science Foundation of China (Grant Nos. 60278017, 30328014, and 30370463) and the National
Basic Research Program of China (Grant No. 2004CB520804) 相似文献
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The design of a noncollinear acousto-optic tunable filter (AOTF) is commonly based on parallel tangent momentum-matching condition. Previous studies have either moving parts or modulation. These approaches would obviously decrease the accuracy of an acousto-optic tunable filter (AOTF) since it will be influenced by vibration or by an extended measurement time. In this paper, we introduce a novel noncollinear acousto-optic tunable filter division-of-amplitude photopolarimeter (DOAP). It is completely characterized by a wavelength-dependent 4 × 4 matrix that can be determined directly by calibration. The instrument has neither moving parts nor modulation. Besides, this system can acquire the image, spectral and polarization information of an object simultaneously. 相似文献
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基于激光器频率谱检测技术,沿着光的传输方向分析了光波在谐振式集成光学陀螺系统中的传播,结合输入信号特征,建立频域内的数学模型,通过数值仿真和实验得到了调频检测系统下的解调曲线。按照光的传输方向:激光器、声光晶体移频器、光波导环形谐振器、探测器,利用贝塞尔函数展开和光场耦合模理论分析了谐振式集成光学陀螺解调特性,及其调频调制检测系统解调输出信号与谐振频率偏差之间的关系。通过数值计算,分析了解调曲线的变化规律,得到了施加在激光器压电陶瓷驱动器上调制波形的最佳调制系数。在实验上搭建了激光器频率调制解调技术系统,得到了解调曲线。数值仿真和实验结果表明,当调制系数M=2时,线性工作区间斜率最大,解调曲线最好。实测形状与理论分析结果相符,从解调信号得到±2×103 rad/s的陀螺动态范围。 相似文献
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The acousto-optic interaction at a water surface perturbed by random waves and by an underwater sound source is studied. The
interferometric method is applied to measure the features of the power spectra of the scattered light field. Detection of
sound-induced perturbation of the rough surface is performed. The corresponding theory of the scattered light spectra modulation
is presented and its results are compared with the data of the experiment.
Published in Russian in Akusticheskiĭ Zhurnal, 2008, Vol. 54, No. 2, pp. 244–250.
The text was submitted by the authors in English. 相似文献
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High-speed, wide-range wavelength scanning is demonstrated using a laser diode with an antireflection coating and an external cavity employing an acousto-optic deflector. The narrow spectral width of 0.2 nm observed in the experiment indicates the availability of a highly coherent laser beam. The scanning range of 15 nm under rapid modulation is confirmed in the prototype system. A tuning rate of more than 100 kHz is achieved without any mode hops. To the best of our knowledge, no such high-speed wavelength tuning based on an acousto-optical configuration has been demonstrated thus far. 相似文献
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对声光效应中光束偏转角进行了一系列实验研究.基于传统声光效应的基本原理,建立了光束偏转角理论模型并进行了相关计算.在此基础上进行声光效应的布拉格衍射实验.大量实验结果显示,所测量到的光束偏转角和理论值存在一定的差距. 相似文献