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Adaptive beam shaping using electro-optic micro-lenses, and hybrid acousto-optics.

机译：使用电光微透镜和混合声光的自适应光束整形。

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摘要

The control of laser beam shape is of great importance for many applications, such as imaging, telecommunications and materials processing. The ability to adaptively implement this process will add another degree of freedom to further enhance its modularity. In this work we explore two different techniques to achieve such goal.; In the first technique we implement and characterize adaptive electro-optic micro-lens array. By splitting the optical beam wavefront and/or distorting such wavefront, one can achieve beam shaping. We provide the basis for such systems using electro-optic microlenses. Since characterization of microlens arrays is quite challenging, the adaptive microlens characterization will provide another hurdle for rapid device prototyping. We introduce, for the first time, a simple technique that allow for in-situ characterization with minimum tools required. Using a simple z-scan we can determine the microlens focal length and characterize its aberration properties. We have used finite element analysis to model the lenslet array and found the model is in agreement with the measured data. We also address lens design and optimization issues to achieve aberration free optical system.; Second, we implement hybrid acousto-optics with feedback for beam shaping. We demonstrate that using electronic feedback one can obtain beam shaping in a hybrid acousto-optic device. Feedback as used and illustrated in the dissertation helps to generate the additional sound pressure which can give additional beam shaping. Previous analysis of hybrid acousto-optic devices with feedback have been restricted to plane wave treatments only. We show that over a region of convergence, one can achieve beam shaping by using the detected optical output and feeding it back electronically, together with the external radio frequency (RF) input signal. This is fundamentally different than just increasing the electrical input to the transducer. In general, we can also select, in this way, a certain range of spatial frequencies at the optical detector and use this for feedback purposes. We can selectively feed back a range of spatial frequencies of the optical beam, and hence have better control over the resulting beam shape.
机译：激光束形状的控制对于许多应用至关重要，例如成像，电信和材料加工。自适应实施此过程的能力将增加另一个自由度，以进一步增强其模块化。在这项工作中，我们探索实现这一目标的两种不同技术。在第一种技术中，我们实现并描述了自适应电光微透镜阵列。通过分裂光束波前和/或使这种波前失真，可以实现光束整形。我们为使用电光微透镜的此类系统提供了基础。由于微透镜阵列的表征非常具有挑战性，因此自适应微透镜表征将为快速器件原型化提供另一个障碍。我们首次引入了一种简单的技术，可使用最少的工具进行原位表征。使用简单的z扫描，我们可以确定微透镜的焦距并表征其像差特性。我们已经使用有限元分析对小透镜阵列建模，发现该模型与实测数据一致。我们还将解决透镜设计和优化问题，以实现无像差的光学系统。其次，我们将带反馈的混合声光技术应用于光束整形。我们证明了使用电子反馈可以在混合声光设备中获得光束整形。本文所使用和说明的反馈有助于产生额外的声压，从而产生额外的声束整形。先前对具有反馈的混合声光设备的分析仅限于平面波治疗。我们表明，在会聚区域上，可以通过使用检测到的光输出并将其与外部射频（RF）输入信号一起以电子方式反馈来实现光束整形。这与仅增加换能器的电输入有根本不同。通常，我们还可以通过这种方式在光学检测器上选择一定范围的空间频率，并将其用于反馈目的。我们可以有选择地反馈光束的空间频率范围，因此可以更好地控制最终的光束形状。

著录项

  • 作者

    Abdelaziez, Yasser A.;

  • 作者单位

    University of Dayton.;

  • 授予单位 University of Dayton.;
  • 学科 Physics Optics.; Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 136 p.
  • 总页数 136
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 光学;无线电电子学、电信技术;
  • 关键词

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