Focusing Error Detection Method in Microholographic Data Storage System Using Polarization Characteristics
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概要
- 論文の詳細を見る
We present a disk-focusing error detection method for microholographic data storage systems using polarization characteristics. In high-speed optical storage systems, disturbances exist along the vertical direction of a disk. The diffraction efficiency of a readout signal depends on the distance between the focusing point of the reference beam and the vertical center of the microholographic grating. The proposed disk focusing error detection method uses only one laser source, unlike most existing systems, which use two laser sources. By using polarization characteristics, disk-focusing and reading beams are inserted in the media without interference, and the proposed system achieves the simultaneous reading of microholograms and disk-focusing control. By evaluating the focus error signal, we verified the reliability of the optical path and tolerable $S$-curve (FES) balance (1.8%) for the proposed system. It is possible to achieve a diffraction efficiency of over 90% at the best focus position using the proposed disk-focusing method.
- 2011-09-25
著者
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Park No-cheol
Department Of Mechanical Engineering Yonsei University
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Park Kyoung-Su
Department of Mechanical Engineering, Yonsei Univ.
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Park Young-pil
Department Of Mechanical Engineering Yonsei University
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Yang Hyunseok
Department of Mechanical Engineering, Yonsei University
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Park No-Cheol
Department of Mechanical Engineering, Yonsei University, Seoul 120-749, Korea
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Kim Taeseob
Department of Mechanical Engineering, Yonsei University, Seoul 120-749, Korea
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Im Chang-Hyuk
Department of Mechanical Engineering, Yonsei University, Seoul 120-749, Korea
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Lee Sang-Hyuck
Department of Mechanical Engineering, Yonsei University, Seoul 120-749, Korea
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Kim Nakyeong
Center for Information Storage Device, Yonsei University, Seoul 120-749, Korea
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Park Kyoung-Su
Department of Mechanical Engineering, YERC#332, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul 120-749, Korea
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Park Young-Pil
Department of Mechanical Engineering, Yonsei University, Seoul 120-749, Korea
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