Focusing error detection method in microholographic data storage system using polarization characteristics

Taeseob Kim, Chang Hyuk Im, Sang Hyuck Lee, Nakyeong Kim, No Cheol Park, Hyunseok Yang, Young Pil Park, Kyoung Su Park

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article number09ME07
JournalJapanese journal of applied physics
Issue number9 PART 2
Publication statusPublished - 2011 Sept

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)


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