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20 September 2017 Adaptive optics for data recovery on optical disk fragments (Conference Presentation)
Thomas D. Milster, Young Sik Kim
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Proceedings Volume 10384, Optical Data Storage 2017: From New Materials to New Systems; 103840J (2017) https://doi.org/10.1117/12.2277078
Event: SPIE Optical Engineering + Applications, 2017, San Diego, California, United States
Abstract
An adaptive optics system is designed and constructed to recover information from damaged optical media. The system is based on an Olympus IX70 microscope with custom illumination and detection. A scanning 408nm laser beam provides both the reference beam for the adaptive optics system and the data beam for imaging of data marks. A two-dimensional galvanometer system is used to scan the focused laser over the sample, and a precision z stage is used to change focus planes. The adaptive optics system is based on a Thorlabs AO kit with a Shack-Hartman wavefront sensor and a deformable mirror. A custom objective lens using a solid immersion lens is implemented that provides NA up to 1.5. Several types of data storage substrates are examined, including partial DVD and BD substrates, small 2cm-square pieces of DVD and BD substrates, and dust fragments on the order of 2mm in size. In order to view the dust fragments, they are collected on a microscope slide and melted to reflow the plastic and reveal data-containing flakes.
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Thomas D. Milster and Young Sik Kim "Adaptive optics for data recovery on optical disk fragments (Conference Presentation)", Proc. SPIE 10384, Optical Data Storage 2017: From New Materials to New Systems, 103840J (20 September 2017); https://doi.org/10.1117/12.2277078
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KEYWORDS
Adaptive optics
Digital video discs
Microscopes
Optical design
Solids
Deformable mirrors
Imaging systems
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