AV-Portal 3.23.2 (82e6d442014116effb30fa56eb6dcabdede8ee7f)

Discrete calculation of the off-axis angular spectrum based light propagation

Video in TIB AV-Portal: Discrete calculation of the off-axis angular spectrum based light propagation

Formal Metadata

Title
Discrete calculation of the off-axis angular spectrum based light propagation
Title of Series
Part Number
22
Number of Parts
47
Author
License
CC Attribution - NoDerivatives 2.0 UK: England & Wales:
You are free to use, copy, distribute and transmit the work or content in unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
Identifiers
Publisher
Release Date
2012
Language
English

Content Metadata

Subject Area
Abstract
Light propagation in a free space is a common computational task in many computer generated holography algorithms. A solution based on angular spectrum decomposition is used frequently. However, its correct off-axis numerical implementation is not straightforward. It is shown that for long distance propagation it is necessary to use digital low-pass filtering for transfer function calculation in order to restrict source area illumination to a finite area. It is also shown that for short distance propagation it is necessary to introduce frequency bands folding in transfer function calculation in order to simulate finite source area propagation. In both cases it is necessary to properly define interpolation filters that reconstruct continuous nature of the source area out of its sampled representation. It is also necessary to properly zero-pad source area sampling in order to avoid artifacts that stem from the periodic nature of the fast Fourier transform.
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