홀로그래픽 저장장치의 실시간 광 노출시간 제어

Real-time Beam Exposure Time Control of Holographic Data Storage

  • 한초록 (연세대학교 정보저장기기 연구센터) ;
  • 김낙영 (연세대학교 정보저장공학 협동과정) ;
  • 송희찬 (연세대학교 기계공학과) ;
  • 임성용 (연세대학교 기계공학과) ;
  • 박노철 (연세대학교 기계공학과) ;
  • 박영필 (연세대학교 기계공학과) ;
  • 양현석 (연세대학교 기계공학과)
  • 투고 : 2010.09.08
  • 심사 : 2010.09.17
  • 발행 : 2010.09.25

초록

Holographic data storage system is one of next generation high density optical memories. Thereby storing multiple data pages using multiplexing method in one spot, we can achieve high store density and fast access time. However, for uniform writing, we must control exposure time properly by the change of writing material characteristics. Many studies have been investigated about exposure time scheduling. However, once it is decided, we cannot change the scheduled time. Therefore, it is hard to obtain uniform data intensity. In this study, we propose exposure time control method using additional red beam as the monitoring signal. Through reconstructed red beam intensity in real time, we can adjust exposure time by the writing condition change. We construct compensation method mathematically and verify the feasibility of proposed method through the experiments.

키워드

참고문헌

  1. Hans J.Coufal, Demetri Psaltis and Glen T. Sincerbox, 2000, "Holographic Data Storage", Springer.
  2. Geoffrey W, Burr, C. Michael Jefferson, Hans Coufal, Mark Jurich, John A. Hoffnagle et al., 2001, "Volume holographic data storage at an areal density of 250 gigapixels/$in^{2}$", Optics Letters, Vol. 26, No. 7, pp.444-446. https://doi.org/10.1364/OL.26.000444
  3. Pochi Yeh, 1993, "Introduction to Photorefractive Nonlinear Optics", Wiley-Interscience.