Wavefront Characteristics of a Digital Holographic Optical Element
In this study, a 50 × 50 mm holographic optical element (HOE) with the property of a spherical mirror was recorded digitally on a silver halide photoplate using a wavefront printing method. It consisted of 51 × 96 hologram spots with each spot measuring 0.98 × 0.52 mm. The wavefronts and optical per...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-06-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/14/6/1229 |
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| author | Beom-Ryeol Lee José Gil Marichal-Hernández José Manuel Rodríguez-Ramos Wook-Ho Son Sunghee Hong Jung-Young Son |
| author_facet | Beom-Ryeol Lee José Gil Marichal-Hernández José Manuel Rodríguez-Ramos Wook-Ho Son Sunghee Hong Jung-Young Son |
| author_sort | Beom-Ryeol Lee |
| collection | DOAJ |
| description | In this study, a 50 × 50 mm holographic optical element (HOE) with the property of a spherical mirror was recorded digitally on a silver halide photoplate using a wavefront printing method. It consisted of 51 × 96 hologram spots with each spot measuring 0.98 × 0.52 mm. The wavefronts and optical performance of the HOE were compared with those of reconstructed images from a point hologram displayed on DMDs of different pixel structures. The same comparison was also performed with an analog-type HOE for a heads-up display and with a spherical mirror. A Shack–Hartmann wavefront sensor was used to measure the wavefronts of the diffracted beams from the digital HOE and the holograms as well as the reflected beam from the analog HOE and the mirror when a collimated beam was incident on them. These comparisons revealed that the digital HOE could perform as a spherical mirror, but they also revealed astigmatism—as in the reconstructed images from the holograms on DMDs—and that its focusability was worse than that of the analog HOE and the spherical mirror. A phase map, i.e., the polar coordinate-type presentation of the wavefront, could visualize the wavefront distortions more clearly than the reconstructed wavefronts obtained using Zernike polynomials. The phase map revealed that the wavefront of the digital HOE was more distorted than those of the analog HOE and the spherical mirror. |
| first_indexed | 2024-03-11T02:09:36Z |
| format | Article |
| id | doaj.art-b8af55ff93ba461fadf52bad519913aa |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-03-11T02:09:36Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-b8af55ff93ba461fadf52bad519913aa2023-11-18T11:40:11ZengMDPI AGMicromachines2072-666X2023-06-01146122910.3390/mi14061229Wavefront Characteristics of a Digital Holographic Optical ElementBeom-Ryeol Lee0José Gil Marichal-Hernández1José Manuel Rodríguez-Ramos2Wook-Ho Son3Sunghee Hong4Jung-Young Son5CG/Vision Section, Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of KoreaIndustrial Engineering Department, Universidad de La Laguna, 38200 La Laguna, SpainIndustrial Engineering Department, Universidad de La Laguna, 38200 La Laguna, SpainCG/Vision Section, Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of KoreaHologram Research Center, Korea Electronics Technology Institute, Seoul 03924, Republic of KoreaPublic Safety Research Center, Konyang University, Nonsan 32992, Republic of KoreaIn this study, a 50 × 50 mm holographic optical element (HOE) with the property of a spherical mirror was recorded digitally on a silver halide photoplate using a wavefront printing method. It consisted of 51 × 96 hologram spots with each spot measuring 0.98 × 0.52 mm. The wavefronts and optical performance of the HOE were compared with those of reconstructed images from a point hologram displayed on DMDs of different pixel structures. The same comparison was also performed with an analog-type HOE for a heads-up display and with a spherical mirror. A Shack–Hartmann wavefront sensor was used to measure the wavefronts of the diffracted beams from the digital HOE and the holograms as well as the reflected beam from the analog HOE and the mirror when a collimated beam was incident on them. These comparisons revealed that the digital HOE could perform as a spherical mirror, but they also revealed astigmatism—as in the reconstructed images from the holograms on DMDs—and that its focusability was worse than that of the analog HOE and the spherical mirror. A phase map, i.e., the polar coordinate-type presentation of the wavefront, could visualize the wavefront distortions more clearly than the reconstructed wavefronts obtained using Zernike polynomials. The phase map revealed that the wavefront of the digital HOE was more distorted than those of the analog HOE and the spherical mirror.https://www.mdpi.com/2072-666X/14/6/1229digital HOEoptical performancephase mapreconstructed wavefrontShack–Hartmann sensorZernike polynomials |
| spellingShingle | Beom-Ryeol Lee José Gil Marichal-Hernández José Manuel Rodríguez-Ramos Wook-Ho Son Sunghee Hong Jung-Young Son Wavefront Characteristics of a Digital Holographic Optical Element Micromachines digital HOE optical performance phase map reconstructed wavefront Shack–Hartmann sensor Zernike polynomials |
| title | Wavefront Characteristics of a Digital Holographic Optical Element |
| title_full | Wavefront Characteristics of a Digital Holographic Optical Element |
| title_fullStr | Wavefront Characteristics of a Digital Holographic Optical Element |
| title_full_unstemmed | Wavefront Characteristics of a Digital Holographic Optical Element |
| title_short | Wavefront Characteristics of a Digital Holographic Optical Element |
| title_sort | wavefront characteristics of a digital holographic optical element |
| topic | digital HOE optical performance phase map reconstructed wavefront Shack–Hartmann sensor Zernike polynomials |
| url | https://www.mdpi.com/2072-666X/14/6/1229 |
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