Thermal Fringe Formation during a Hologram Recording Using a Dry Photopolymer
In this study we investigated the undesired but possible fringe formation during the recording of large size holographic optical elements (HOE) using a dry photopolymer. We identified the deformation of the recording element during hologram exposure as the main source for this fringe formation. This...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-12-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/8/12/589 |
| _version_ | 1797501472791855104 |
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| author | Friedrich-Karl Bruder Thomas Fäcke Thomas Rölle |
| author_facet | Friedrich-Karl Bruder Thomas Fäcke Thomas Rölle |
| author_sort | Friedrich-Karl Bruder |
| collection | DOAJ |
| description | In this study we investigated the undesired but possible fringe formation during the recording of large size holographic optical elements (HOE) using a dry photopolymer. We identified the deformation of the recording element during hologram exposure as the main source for this fringe formation. This deformation is caused mainly by the one-sided heating of the recording element, namely, the dry photopolymer–recording plate stack. It turned out that the main source for this heating was the heat of polymerization in the dry photopolymer released during the exposure interval. These insights were translated into a physical model with which quantitative predictions about thermal fringe formation can be made depending on the actual HOE recording geometry, recording conditions and characteristics of the dry photopolymer. Using this model, different types of large size HOEs, used as components to generate a steerable confined view box for a 23” diagonal size display demonstrator, could be recorded successfully without thermal fringe formation. Key strategies to avoid thermal fringe formation deduced from this model include balancing the ratio of lateral recording plate dimension <i>R</i> to its thickness <i>h</i>, recording the power density <i>P</i> or equivalently the exposure time <i>t<sub>exp</sub></i> at a fixed recording dosage <i>E</i>, and most importantly recording the the linear coefficient of thermal expansion (<i>CTE</i>) of the recording plate material. Suitable glass plates with extremely low <i>CTE</i> were identified and used for recording of the above-mentioned HOEs. |
| first_indexed | 2024-03-10T03:18:54Z |
| format | Article |
| id | doaj.art-e82415a9d603418a8d6a25ef5c5b1a70 |
| institution | Directory Open Access Journal |
| issn | 2304-6732 |
| language | English |
| last_indexed | 2024-03-10T03:18:54Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj.art-e82415a9d603418a8d6a25ef5c5b1a702023-11-23T10:09:17ZengMDPI AGPhotonics2304-67322021-12-0181258910.3390/photonics8120589Thermal Fringe Formation during a Hologram Recording Using a Dry PhotopolymerFriedrich-Karl Bruder0Thomas Fäcke1Thomas Rölle2Covestro Deutschland AG, D-51365 Leverkusen, GermanyCovestro Deutschland AG, D-51365 Leverkusen, GermanyCovestro Deutschland AG, D-51365 Leverkusen, GermanyIn this study we investigated the undesired but possible fringe formation during the recording of large size holographic optical elements (HOE) using a dry photopolymer. We identified the deformation of the recording element during hologram exposure as the main source for this fringe formation. This deformation is caused mainly by the one-sided heating of the recording element, namely, the dry photopolymer–recording plate stack. It turned out that the main source for this heating was the heat of polymerization in the dry photopolymer released during the exposure interval. These insights were translated into a physical model with which quantitative predictions about thermal fringe formation can be made depending on the actual HOE recording geometry, recording conditions and characteristics of the dry photopolymer. Using this model, different types of large size HOEs, used as components to generate a steerable confined view box for a 23” diagonal size display demonstrator, could be recorded successfully without thermal fringe formation. Key strategies to avoid thermal fringe formation deduced from this model include balancing the ratio of lateral recording plate dimension <i>R</i> to its thickness <i>h</i>, recording the power density <i>P</i> or equivalently the exposure time <i>t<sub>exp</sub></i> at a fixed recording dosage <i>E</i>, and most importantly recording the the linear coefficient of thermal expansion (<i>CTE</i>) of the recording plate material. Suitable glass plates with extremely low <i>CTE</i> were identified and used for recording of the above-mentioned HOEs.https://www.mdpi.com/2304-6732/8/12/589photopolymervolume bragg gratingthermal fringe |
| spellingShingle | Friedrich-Karl Bruder Thomas Fäcke Thomas Rölle Thermal Fringe Formation during a Hologram Recording Using a Dry Photopolymer Photonics photopolymer volume bragg grating thermal fringe |
| title | Thermal Fringe Formation during a Hologram Recording Using a Dry Photopolymer |
| title_full | Thermal Fringe Formation during a Hologram Recording Using a Dry Photopolymer |
| title_fullStr | Thermal Fringe Formation during a Hologram Recording Using a Dry Photopolymer |
| title_full_unstemmed | Thermal Fringe Formation during a Hologram Recording Using a Dry Photopolymer |
| title_short | Thermal Fringe Formation during a Hologram Recording Using a Dry Photopolymer |
| title_sort | thermal fringe formation during a hologram recording using a dry photopolymer |
| topic | photopolymer volume bragg grating thermal fringe |
| url | https://www.mdpi.com/2304-6732/8/12/589 |
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