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Design of computer-generated holographic optical elements for detection and imaging

机译:用于检测和成像的计算机生成全息光学元件的设计

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Abstract: A computer generated holographic optical element (CGHOE) has wider use than a holographic optical element (HOE). The latter which is generated with recording beams of different vergences is less controllable than the former which is generated by a computer as a binary computer hologram with amplitude and phase recorded. There are two main problems in making the latter. One is to make it of high spatial frequency and the other is to design a special phase transfer function for special use. The first problem can be overcome by using e- beam for plotting. The second problem can be solved by optimizing the phase transfer function and minimizing the mean-squared wavefront deviation of the output wavefront. Ways and techniques to do them are analyzed. These lead to the improved performance of the elements. Ray tracing can be used to analyze the image properties of the system. Two design examples for detection and imaging are given. One is the designing of a variable spacing grating to have linear effect for measuring of displacement and thickness. The other is the designing of a lens to have extended field of view for copy machine, facsimile machine, or scanner. !0
机译:摘要:计算机生成的全息光学元件(CGHOE)比全息光学元件(HOE)具有更广泛的用途。后者由不同聚散度的记录光束产生,比前者由计算机作为二进制计算机全息图产生并记录振幅和相位,前者的可控性较低。制作后者有两个主要问题。一种是使其具有较高的空间频率,另一种是设计一种特殊用途的特殊相转移函数。第一个问题可以通过使用电子束进行绘制来解决。第二个问题可以通过优化相转移函数和最小化输出波前的均方波前偏差来解决。分析了实现这些目标的方法和技术。这些导致元件的性能提高。光线跟踪可用于分析系统的图像属性。给出了两个用于检测和成像的设计实例。一种是设计可变间距光栅,使其具有线性效应,以测量位移和厚度。另一种是将镜头设计为具有更大的视野,可用于复印机,传真机或扫描仪。 !0

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