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Proceedings Paper

Large-scale computer-generated absorption holograms of 3D objects: II. Practical methodology
Author(s): Nicholas J. Phillips; Colin D. Cameron; Adrian K. Dodd; Douglas A. Payne; David T. Sheerin; Christopher W. Slinger
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Paper Abstract

As a support to the advances in theoretical understanding and computational methods, we describe a new laser plotter technique that enables, in principle, an unlimited size of pixel array to be plotted efficiently with a rigorous estimate of duration of the plot run time. Developments in laser plotter design are presented that allow the formation of pixellated holographic structures of high precision (c. 1 - 10 micron pixel dia.) with an accompanying high pixel count (e.g. at least up to, and beyond, 104 per side within a square array). The case of absorption holograms offers an easy route to a good quality result. We can then exploit the many tricks of amplitude holography borrowed from lithographic and holographic experience using ultra-fine grain silver halide materials. The problem of exposure quantization and linearization is addressed in a pragmatic fashion. The central issue of why such holograms can tolerate intrinsic diffraction artifacts within each pixel is considered along with the exposure level quantization -- it is difficult to print individual pixels within which the optical density is clinically uniform. We cannot over-estimate the reliability difficulties that can arise in a system designed to print massive arrays of pixels in a serial fashion. The electronic testing involved has to be associated with error-free repeatability and high accompanying switching speeds. This may look easy but it is the major issue that distinguishes serially printed digital holography from the simple one-step parallel process of forming the ordinary hologram.

Paper Details

Date Published: 25 March 1999
PDF: 10 pages
Proc. SPIE 3637, Practical Holography XIII, (25 March 1999); doi: 10.1117/12.343784
Show Author Affiliations
Nicholas J. Phillips, De Montfort Univ. (United Kingdom)
Colin D. Cameron, Defence Evaluation and Research Agency Malvern (United Kingdom)
Adrian K. Dodd, De Montfort Univ. (United Kingdom)
Douglas A. Payne, Defence Evaluation and Research Agency Malvern (United Kingdom)
David T. Sheerin, Defence Evaluation and Research Agency Malvern (United Kingdom)
Christopher W. Slinger, Defence Evaluation and Research Agency Malvern (United Kingdom)

Published in SPIE Proceedings Vol. 3637:
Practical Holography XIII
Stephen A. Benton, Editor(s)

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