Speckle Noise-Free Interconnective Holographic Projection
Generally, speckle noise is regarded as unavoidable in holographic projection, and it results from unexpected high spatial frequency components of diffracted light at the sharp edge of pixel openings in a spatial light modulator. Speckle noise typically reduces image contrast and degrades the image...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-11-01
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| Series: | Photonics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2304-6732/9/12/899 |
| _version_ | 1797455628972589056 |
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| author | Hosung Jeon Joonku Hahn |
| author_facet | Hosung Jeon Joonku Hahn |
| author_sort | Hosung Jeon |
| collection | DOAJ |
| description | Generally, speckle noise is regarded as unavoidable in holographic projection, and it results from unexpected high spatial frequency components of diffracted light at the sharp edge of pixel openings in a spatial light modulator. Speckle noise typically reduces image contrast and degrades the image quality of the holographic projection. In this study, we propose a novel holographic optical interconnection method free of speckle noise in holographic projection. This optical interconnection is achieved by using a holographic optical element (HOE). The HOE is designed to reconstruct Gaussian beams with low divergence. These Gaussian beams become points which form target images at desired depths. Since the Gaussian beam from the HOE does not share the same position with other Gaussian beams, there is no interference at the projection image. Therefore, the image is composed of the points from the Gaussian beams and there is no reason for unexpected high spatial frequency noise to appear on the image. In this paper, we fabricate the HOE, produced with our specially manufactured hologram printer, where the directions of two Gaussian beams with low divergence are controlled by goniometers. We experimentally demonstrated a speckle noise-free interconnective holographic projection. Two images are successfully formed at different depths by optically connecting two points in pairs. |
| first_indexed | 2024-03-09T15:57:02Z |
| format | Article |
| id | doaj.art-0b310aebaf494f939b39c5b26224fc1b |
| institution | Directory Open Access Journal |
| issn | 2304-6732 |
| language | English |
| last_indexed | 2024-03-09T15:57:02Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj.art-0b310aebaf494f939b39c5b26224fc1b2023-11-24T17:24:25ZengMDPI AGPhotonics2304-67322022-11-0191289910.3390/photonics9120899Speckle Noise-Free Interconnective Holographic ProjectionHosung Jeon0Joonku Hahn1School of Electronic and Electrical Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 41566, Republic of KoreaSchool of Electronic and Electrical Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 41566, Republic of KoreaGenerally, speckle noise is regarded as unavoidable in holographic projection, and it results from unexpected high spatial frequency components of diffracted light at the sharp edge of pixel openings in a spatial light modulator. Speckle noise typically reduces image contrast and degrades the image quality of the holographic projection. In this study, we propose a novel holographic optical interconnection method free of speckle noise in holographic projection. This optical interconnection is achieved by using a holographic optical element (HOE). The HOE is designed to reconstruct Gaussian beams with low divergence. These Gaussian beams become points which form target images at desired depths. Since the Gaussian beam from the HOE does not share the same position with other Gaussian beams, there is no interference at the projection image. Therefore, the image is composed of the points from the Gaussian beams and there is no reason for unexpected high spatial frequency noise to appear on the image. In this paper, we fabricate the HOE, produced with our specially manufactured hologram printer, where the directions of two Gaussian beams with low divergence are controlled by goniometers. We experimentally demonstrated a speckle noise-free interconnective holographic projection. Two images are successfully formed at different depths by optically connecting two points in pairs.https://www.mdpi.com/2304-6732/9/12/899optical interconnectionspeckle reductionholographic projectionhologram printer |
| spellingShingle | Hosung Jeon Joonku Hahn Speckle Noise-Free Interconnective Holographic Projection Photonics optical interconnection speckle reduction holographic projection hologram printer |
| title | Speckle Noise-Free Interconnective Holographic Projection |
| title_full | Speckle Noise-Free Interconnective Holographic Projection |
| title_fullStr | Speckle Noise-Free Interconnective Holographic Projection |
| title_full_unstemmed | Speckle Noise-Free Interconnective Holographic Projection |
| title_short | Speckle Noise-Free Interconnective Holographic Projection |
| title_sort | speckle noise free interconnective holographic projection |
| topic | optical interconnection speckle reduction holographic projection hologram printer |
| url | https://www.mdpi.com/2304-6732/9/12/899 |
| work_keys_str_mv | AT hosungjeon specklenoisefreeinterconnectiveholographicprojection AT joonkuhahn specklenoisefreeinterconnectiveholographicprojection |