Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/24950
DC Field | Value | Language |
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dc.contributor.author | Alata, Romain | en_US |
dc.contributor.author | PARIANI, Giorgio | en_US |
dc.contributor.author | Zamkotsian, Frederic | en_US |
dc.contributor.author | Lanzoni, Patrick | en_US |
dc.contributor.author | BIANCO, ANDREA | en_US |
dc.contributor.author | Bertarelli, Chiara | en_US |
dc.date.accessioned | 2020-05-19T08:46:54Z | - |
dc.date.available | 2020-05-19T08:46:54Z | - |
dc.date.issued | 2016 | en_US |
dc.identifier.isbn | 9781510602038 | en_US |
dc.identifier.isbn | 9781510602045 | en_US |
dc.identifier.issn | 0277-786X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/24950 | - |
dc.description.abstract | Computer Generated Holograms (CGHs) are useful for wavefront shaping and complex optics testing, including aspherical and free-form optics. Today, CGHs are recorded directly with a laser or intermediates masks but allows only recording binary CGHs; binary CGHs are efficient but can reconstruct only pixilated images. We propose to use a Digital Micro-mirror Device (DMD) for writing binary CGHs as well as grayscale CGHs, able to reconstruct fulfilled images. DMD is actually studied at LAM, for generating programmable slit masks in multi-object spectrographs. It is composed of 2048x1080 individually controllable micro-mirrors, with a pitch of 13.68 μm. This is a real-time reconfigurable mask, perfect for recording CGHs. A first setup has been developed for hologram recording, where the DMD is enlightened with a collimated beam and illuminates a photosensible plate through an Offner relay, with a magnification of 1:1. Our set up resolution is 2-3 μm, leading to a CGH resolution equal to the DMD micro mirror size. In order to write and erase CGHs during test procedure or on request, we use a photochromic plate called PUR-GD71-50-ST developed at Politecnico di Milano. It is opaque at rest, and becomes transparent when it is illuminated with visible light, between 500 and 700 nm; then it can be erased by a UV flash. We choose to code the CGHs in equally spaced levels, so called stepped CGH. We recorded up to 1000x1000 pixels CGHs with a contrast greater than 50, knowing that the material is able to reach an ultimate contrast of 1000. A second bench has also been developed, dedicated to the reconstruction of the recorded images with a 632.8nm He-Ne laser beam. Very faithful reconstructions have been obtained. Thanks to our recording and reconstruction set-ups, we have been able to successfully record binary and stepped CGHs, and reconstruct them with a high fidelity, revealing the potential of this method for generating programmable/rewritable stepped CGHs on photochromic materials. | en_US |
dc.language.iso | eng | en_US |
dc.title | Programmable CGH on photochromic material using DMD | en_US |
dc.type | Conference paper | - |
dc.identifier.doi | 10.1117/12.2234406 | en_US |
dc.identifier.scopus | 2-s2.0-84996931620 | en_US |
dc.identifier.isi | 000387747900094 | en_US |
dc.identifier.url | https://www.spiedigitallibrary.org/conference-proceedings-of-spie/9912/1/Programmable-CGH-on-photochromic-material-using-DMD/10.1117/12.2234406.full?SSO=1 | en_US |
dc.relation.medium | ELETTRONICO | en_US |
dc.relation.volume | 9912 | en_US |
dc.relation.firstpage | 991234 | en_US |
dc.type.referee | REF_0 | en_US |
dc.relation.alleditors | Navarro, Ramón; Burge, James H. | en_US |
dc.relation.ispartofbook | Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II | en_US |
dc.publisher.name | SPIE | en_US |
dc.publisher.place | Bellingham, WA | en_US |
dc.relation.conferencename | Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II | en_US |
dc.relation.conferenceplace | Edinburgh, UK | en_US |
dc.relation.conferencedate | 26 June-1 July, 2016 | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.type.miur | 273 Contributo in Atti di convegno | - |
dc.relation.series | PROCEEDINGS OF SPIE | en_US |
dc.identifier.adsbibcode | 2016SPIE.9912E..34A | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Conference paper | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | O.A. Brera | - |
crisitem.author.dept | O.A. Brera | - |
crisitem.author.orcid | 0000-0003-3724-7667 | - |
crisitem.author.orcid | 0000-0002-7691-404X | - |
crisitem.journal.journalissn | 0277-786X | - |
crisitem.journal.ance | E136238 | - |
Appears in Collections: | 3.01 Contributi in Atti di convegno |
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File | Description | Size | Format | |
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SPIE991234.pdf | PDF editoriale | 1.23 MB | Adobe PDF | View/Open |
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