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

Ming-Wen Chang

doi:10.1117/12.142047

1 April 1993 Design of computer-generated holographic optical elements for detection and imaging

Ming-Wen Chang

Proceedings Volume 1982, Photoelectronic Detection and Imaging: Technology and Applications '93; (1993) https://doi.org/10.1117/12.142047
Event: Photoelectronic Detection and Imaging: Technology and Applications '93, 1993, Beijing, China

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.

Citation Download Citation

Ming-Wen Chang "Design of computer-generated holographic optical elements for detection and imaging", Proc. SPIE 1982, Photoelectronic Detection and Imaging: Technology and Applications '93, (1 April 1993); https://doi.org/10.1117/12.142047

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