Publication:
Effect of spatial coherence of LED sources on image resolution in holographic displays

dc.contributorChien, L. C.
dc.contributorYoon, T. H.
dc.contributorLee, S. D.
dc.contributor.departmentDepartment of Electrical and Electronics Engineering
dc.contributor.kuauthorAas, Mehdi
dc.contributor.kuauthorGhoushchi, Vahid Pourreza
dc.contributor.kuauthorUlusoy, Erdem
dc.contributor.kuauthorÜrey, Hakan
dc.contributor.schoolcollegeinstituteCollege of Engineering
dc.date.accessioned2024-11-09T12:31:42Z
dc.date.issued2017
dc.description.abstractHolographic Displays (HDs) provide 3D images with all natural depth cues via computer generated holograms (CGHs) implemented on spatial light modulators (SLMs). HDs are coherent light processing systems based on interference and diffraction, thus they generally use laser light. However, laser sources are relatively expensive, available only at some particular wavelengths and difficult to miniaturize. In addition, highly coherent nature of laser light makes some undesired visual effects quite evident, such as speckle noise, interference due to stray light or defects of optical components. On the other hand, LED sources are available in variety of wavelengths, has small die size, and no speckle artifact. However, their finite spatial size introduce some degree of spatial incoherence in an HD system and degrade image resolution, which is the subject of the study in this paper. Our theoretical analysis indicates that the amount of resolution loss depends on the distance between hologram and SLM image planes. For some special configurations, the source size has no effect at all. We also performed experiments with different configurations using lasers and LEDs with different emission areas that vary from 50 mu m to 200 ae m, and determined Contrast Transfer Function (CTF) curves which agree well with our theoretical model. The results show that it is possible to find configurations where LEDs combined with pinholes almost preserve natural resolution limit of human eye while keeping the loss in light efficiency within tolerable limits.
dc.description.fulltextYES
dc.description.indexedbyWOS
dc.description.indexedbyScopus
dc.description.openaccessYES
dc.description.publisherscopeInternational
dc.description.sponsoredbyTubitakEuEU
dc.description.sponsorshipEuropean Research Council Advanced Grant (ERC-AdG) Wear3D Project
dc.description.versionPublisher Version
dc.identifier.doi10.1117/12.2252413
dc.identifier.eissn1996-756X
dc.identifier.embargoNO
dc.identifier.filenameinventorynoIR01198
dc.identifier.issn0277-786X
dc.identifier.quartileN/A
dc.identifier.scopus2-s2.0-85019475867
dc.identifier.urihttps://doi.org/10.1117/12.2252413
dc.identifier.wos405468000009
dc.keywordsHolographic displays
dc.keywordsComputer generated holograms
dc.keywordsCGH
dc.keywordsSpatial coherence
dc.keywordsImage resolution. Coherence effect
dc.keywordsDigital holography
dc.keywordsCoherence effects in resolution
dc.language.isoeng
dc.publisherSociety of Photo-optical Instrumentation Engineers (SPIE)
dc.relation.grantno340200
dc.relation.ispartofProceedings of SPIE
dc.relation.urihttp://cdm21054.contentdm.oclc.org/cdm/ref/collection/IR/id/2309
dc.subjectElectrical and electronic engineering
dc.subjectOptics
dc.titleEffect of spatial coherence of LED sources on image resolution in holographic displays
dc.typeConference Proceeding
dspace.entity.typePublication
local.contributor.kuauthorGhoushchi, Vahid Pourreza
local.contributor.kuauthorAas, Mehdi
local.contributor.kuauthorUlusoy, Erdem
local.contributor.kuauthorÜrey, Hakan
local.publication.orgunit1College of Engineering
local.publication.orgunit2Department of Electrical and Electronics Engineering
relation.isOrgUnitOfPublication21598063-a7c5-420d-91ba-0cc9b2db0ea0
relation.isOrgUnitOfPublication.latestForDiscovery21598063-a7c5-420d-91ba-0cc9b2db0ea0
relation.isParentOrgUnitOfPublication8e756b23-2d4a-4ce8-b1b3-62c794a8c164
relation.isParentOrgUnitOfPublication.latestForDiscovery8e756b23-2d4a-4ce8-b1b3-62c794a8c164

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