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首页> 外文学位 >Theory and applications of the dynamics and signal cross-correlations in photorefractive two-beam coupling.
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Theory and applications of the dynamics and signal cross-correlations in photorefractive two-beam coupling.

机译：光折射两光束耦合中的动力学和信号互相关的理论和应用。

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摘要

The transfer function and impulse response of photorefractive media are derived in the undepleted pump limit with passive absorption. The bandwidth of the transfer function is comparable to an inverse photorefractive time constant. The impulse response is time delayed by the product of the coupling and the time constant, and its FWHM is comparable to the delay.;The time delay from photorefractive gain and a saturable photorefractive loss are used to delay 235 ms wide input pulses by 100 ms without change of shape.;The stability boundaries of the photorefractive flip-flop, a bistable optical element recently demonstrated in this lab, are analyzed in the framework of Lotka-Volterra competitive systems and an equivalent Lotka-Volterra system is identified.;Several processing functions offered by reflexive multifrequency beam coupling, in which an incident set of signals couples to a copy of itself, are presented. This spatially distributed coupling process increases the transverse spatial cross correlations between signals. Using the speckle beam coupling solution derived in this group, it is shown that plane wave correlations grow much faster than those of speckle fields due to their long correlation length.;Related techniques in conjunction with perturbation theory are used to derive a crosstalk estimate for photorefractive data storage using lensless binary phase encoding in the presence of noise.;Reflexive multifrequency coupling finds extensive use in the Photorefractive Signal Extractor which isolates an arbitrary component from a stream of spatially superposed signals. I derive the performance of the device and estimate its capacity and contrast performance.;In the weakly nonlinear regime, an approximate solution to the temporal photorefractive grating evolution in terms of damped elliptic functions is identified.
机译：光折射介质的传递函数和脉冲响应是在无吸收泵极限下通过被动吸收得出的。传递函数的带宽可与逆光折射时间常数相媲美。脉冲响应被耦合和时间常数的乘积所延迟，并且其FWHM与延迟相当。;利用光折变增益的时间延迟和可饱和的光折损，将235 ms的宽输入脉冲延迟100 ms ；在形状不改变的情况下；在Lotka-Volterra竞争系统的框架内分析了该实验室最近展示的双稳态光学元件光折变触发器的稳定性边界，并确定了等效的Lotka-Volterra系统。介绍了自反多频波束耦合提供的功能，其中一组入射信号耦合到其自身的副本。这种空间分布的耦合过程增加了信号之间的横向空间互相关。使用该组中导出的散斑光束耦合解决方案，表明平面波相关性由于其较长的相关长度而比散斑场的相关性增长快得多。;结合摄动理论的相关技术被用来得出光折射的串扰估计在有噪声的情况下，使用无透镜二进制相位编码进行数据存储。自反多频耦合在光折射信号提取器中得到了广泛的应用，该提取器从空间叠加信号流中分离出任意分量。我推导了器件的性能，并估计了其性能和对比度性能。在弱非线性条件下，确定了基于阻尼椭圆函数的时间光折变光栅演化的近似解。

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  • 作者

    Hermanns, Anno.;

  • 作者单位

    University of Colorado at Boulder.;

  • 授予单位 University of Colorado at Boulder.;
  • 学科 Optics.
  • 学位 Ph.D.
  • 年度 1993
  • 页码 242 p.
  • 总页数 242
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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