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Optics Letters

Optics Letters


  • Vol. 23, Iss. 22 — Nov. 15, 1998
  • pp: 1781–1783

Reflection-type confocal readout for multilayered optical memory

M. Ishikawa, Y. Kawata, C. Egami, O. Sugihara, N. Okamoto, M. Tsuchimori, and O. Watanabe  »View Author Affiliations

Optics Letters, Vol. 23, Issue 22, pp. 1781-1783 (1998)

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We present a multilayered optical memory for use in reading data with a confocal reflection microscope system. We use a recording medium in which photosensitive thin films and nonphotosensitive transparent films are stacked alternately. Since the photosensitive films are thinner than the depth of focus of the recording beam, the spatial frequency distribution of the recorded bit data is extended in the axial direction. The extended distribution overlaps the coherent optical transfer function of the reflection-type confocal microscope. Urethane–urea copolymer film is used as a photosensitive material. The recording and reading of two layers are demonstrated.

© 1998 Optical Society of America

OCIS Codes
(180.1790) Microscopy : Confocal microscopy
(180.6900) Microscopy : Three-dimensional microscopy
(210.0210) Optical data storage : Optical data storage

M. Ishikawa, Y. Kawata, C. Egami, O. Sugihara, N. Okamoto, M. Tsuchimori, and O. Watanabe, "Reflection-type confocal readout for multilayered optical memory," Opt. Lett. 23, 1781-1783 (1998)

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