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Statements

Subject Item
n2:RIV%2F49777513%3A23520%2F13%3A43919201%21RIV14-MSM-23520___
rdf:type
n15:Vysledek skos:Concept
dcterms:description
Light propagation in a free space is a common computational task in many computer generated holography algorithms. A solution based on the 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 define properly interpolation filters that reconstruct continuous nature of the source area out of its sampled representation. It is also necessary to zero-pad properly source area sampling in order to avoid artifacts that stem from the periodic nature of the fast Fourier transform. Light propagation in a free space is a common computational task in many computer generated holography algorithms. A solution based on the 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 define properly interpolation filters that reconstruct continuous nature of the source area out of its sampled representation. It is also necessary to zero-pad properly source area sampling in order to avoid artifacts that stem from the periodic nature of the fast Fourier transform.
dcterms:title
Discrete calculation of the off-axis angular spectrum based light propagation Discrete calculation of the off-axis angular spectrum based light propagation
skos:prefLabel
Discrete calculation of the off-axis angular spectrum based light propagation Discrete calculation of the off-axis angular spectrum based light propagation
skos:notation
RIV/49777513:23520/13:43919201!RIV14-MSM-23520___
n15:predkladatel
n18:orjk%3A23520
n5:aktivita
n14:P
n5:aktivity
P(LH12181)
n5:cisloPeriodika
1
n5:dodaniDat
n19:2014
n5:domaciTvurceVysledku
n7:4383184
n5:druhVysledku
n12:J
n5:duvernostUdaju
n8:S
n5:entitaPredkladatele
n13:predkladatel
n5:idSjednocenehoVysledku
69839
n5:idVysledku
RIV/49777513:23520/13:43919201
n5:jazykVysledku
n17:eng
n5:klicovaSlova
free-space light propagation; coherent light propagation; computational Fourier optics; computer generated holography
n5:klicoveSlovo
n6:computational%20Fourier%20optics n6:computer%20generated%20holography n6:free-space%20light%20propagation n6:coherent%20light%20propagation
n5:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n5:kontrolniKodProRIV
[844AA9F130FE]
n5:nazevZdroje
Journal of Physics: Conference Series
n5:obor
n11:IN
n5:pocetDomacichTvurcuVysledku
1
n5:pocetTvurcuVysledku
1
n5:projekt
n10:LH12181
n5:rokUplatneniVysledku
n19:2013
n5:svazekPeriodika
415
n5:tvurceVysledku
Lobaz, Petr
n5:wos
000317123700040
s:issn
1742-6588
s:numberOfPages
8
n4:doi
10.1088/1742-6596/415/1/012040
n20:organizacniJednotka
23520