Abstract

High density optical disk recording using an optical superresolution technique is proposed. By setting a shading band in the center of the collimating beam, the focused spot size on the recording medium is reduced to 80% compared with that of a conventional optical recording. The readout signal degradation affected by the focused spot sidelobe on the recording medium is suppressed by spatially extracting the main lobe region from the reflected back beam using a slit on a reimaged plane. The linear recording density has been improved to 1.2 times as high as that for a conventional optical recording using a normal resolution optical head.

© 1990 Optical Society of America

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References

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  1. H. Sukeda, M. Ojima, M. Takahashi, T. Maeda, “High Density Magneto-Optical Disk Using Highly Controlled Pit-Edge Recording,” in Postdeadline Digest, ISOM’87 (1987), paper FC1.
  2. T. Sekiguchi et al., “High Bit Rate Digital Video Recording Using Magneto-Optical Disks,” in Technical Digest, ISOM’87 (1987), paper FB4.
  3. G. Moore, “High Density Format For Sperry/Information Storage Inc. Second Generation Optical Drives,” Proc. Soc. Photo-Opt. Instrum. Eng. 695, 230–238 (1986).
  4. Y. Yamanaka, K. Kubota, H. Fujii, K. Kobayashi, T. Suzuki, H. Gokan, “High Density Magneto-Optical Recording Using 0.67 μm Band High Power Laser Diode,” IEEE Trans. Magn. MAG-24, 2300–2304 (1988).
    [CrossRef]
  5. H. Osterberg, J. E. Wilkins, “The Resolving Power of a Coated Objective,” J. Opt. Soc. Am 39, 553–557 (1949).
    [CrossRef]
  6. W. Lukosz, “Optical System with Resolving Powers Exceeding the Classical Limit,” J. Opt. Soc. Am. 56, 1463–1472 (1966).
    [CrossRef]

1988 (1)

Y. Yamanaka, K. Kubota, H. Fujii, K. Kobayashi, T. Suzuki, H. Gokan, “High Density Magneto-Optical Recording Using 0.67 μm Band High Power Laser Diode,” IEEE Trans. Magn. MAG-24, 2300–2304 (1988).
[CrossRef]

1987 (2)

H. Sukeda, M. Ojima, M. Takahashi, T. Maeda, “High Density Magneto-Optical Disk Using Highly Controlled Pit-Edge Recording,” in Postdeadline Digest, ISOM’87 (1987), paper FC1.

T. Sekiguchi et al., “High Bit Rate Digital Video Recording Using Magneto-Optical Disks,” in Technical Digest, ISOM’87 (1987), paper FB4.

1986 (1)

G. Moore, “High Density Format For Sperry/Information Storage Inc. Second Generation Optical Drives,” Proc. Soc. Photo-Opt. Instrum. Eng. 695, 230–238 (1986).

1966 (1)

1949 (1)

H. Osterberg, J. E. Wilkins, “The Resolving Power of a Coated Objective,” J. Opt. Soc. Am 39, 553–557 (1949).
[CrossRef]

Fujii, H.

Y. Yamanaka, K. Kubota, H. Fujii, K. Kobayashi, T. Suzuki, H. Gokan, “High Density Magneto-Optical Recording Using 0.67 μm Band High Power Laser Diode,” IEEE Trans. Magn. MAG-24, 2300–2304 (1988).
[CrossRef]

Gokan, H.

Y. Yamanaka, K. Kubota, H. Fujii, K. Kobayashi, T. Suzuki, H. Gokan, “High Density Magneto-Optical Recording Using 0.67 μm Band High Power Laser Diode,” IEEE Trans. Magn. MAG-24, 2300–2304 (1988).
[CrossRef]

Kobayashi, K.

Y. Yamanaka, K. Kubota, H. Fujii, K. Kobayashi, T. Suzuki, H. Gokan, “High Density Magneto-Optical Recording Using 0.67 μm Band High Power Laser Diode,” IEEE Trans. Magn. MAG-24, 2300–2304 (1988).
[CrossRef]

Kubota, K.

Y. Yamanaka, K. Kubota, H. Fujii, K. Kobayashi, T. Suzuki, H. Gokan, “High Density Magneto-Optical Recording Using 0.67 μm Band High Power Laser Diode,” IEEE Trans. Magn. MAG-24, 2300–2304 (1988).
[CrossRef]

Lukosz, W.

Maeda, T.

H. Sukeda, M. Ojima, M. Takahashi, T. Maeda, “High Density Magneto-Optical Disk Using Highly Controlled Pit-Edge Recording,” in Postdeadline Digest, ISOM’87 (1987), paper FC1.

Moore, G.

G. Moore, “High Density Format For Sperry/Information Storage Inc. Second Generation Optical Drives,” Proc. Soc. Photo-Opt. Instrum. Eng. 695, 230–238 (1986).

Ojima, M.

H. Sukeda, M. Ojima, M. Takahashi, T. Maeda, “High Density Magneto-Optical Disk Using Highly Controlled Pit-Edge Recording,” in Postdeadline Digest, ISOM’87 (1987), paper FC1.

Osterberg, H.

H. Osterberg, J. E. Wilkins, “The Resolving Power of a Coated Objective,” J. Opt. Soc. Am 39, 553–557 (1949).
[CrossRef]

Sekiguchi, T.

T. Sekiguchi et al., “High Bit Rate Digital Video Recording Using Magneto-Optical Disks,” in Technical Digest, ISOM’87 (1987), paper FB4.

Sukeda, H.

H. Sukeda, M. Ojima, M. Takahashi, T. Maeda, “High Density Magneto-Optical Disk Using Highly Controlled Pit-Edge Recording,” in Postdeadline Digest, ISOM’87 (1987), paper FC1.

Suzuki, T.

Y. Yamanaka, K. Kubota, H. Fujii, K. Kobayashi, T. Suzuki, H. Gokan, “High Density Magneto-Optical Recording Using 0.67 μm Band High Power Laser Diode,” IEEE Trans. Magn. MAG-24, 2300–2304 (1988).
[CrossRef]

Takahashi, M.

H. Sukeda, M. Ojima, M. Takahashi, T. Maeda, “High Density Magneto-Optical Disk Using Highly Controlled Pit-Edge Recording,” in Postdeadline Digest, ISOM’87 (1987), paper FC1.

Wilkins, J. E.

H. Osterberg, J. E. Wilkins, “The Resolving Power of a Coated Objective,” J. Opt. Soc. Am 39, 553–557 (1949).
[CrossRef]

Yamanaka, Y.

Y. Yamanaka, K. Kubota, H. Fujii, K. Kobayashi, T. Suzuki, H. Gokan, “High Density Magneto-Optical Recording Using 0.67 μm Band High Power Laser Diode,” IEEE Trans. Magn. MAG-24, 2300–2304 (1988).
[CrossRef]

IEEE Trans. Magn. (1)

Y. Yamanaka, K. Kubota, H. Fujii, K. Kobayashi, T. Suzuki, H. Gokan, “High Density Magneto-Optical Recording Using 0.67 μm Band High Power Laser Diode,” IEEE Trans. Magn. MAG-24, 2300–2304 (1988).
[CrossRef]

J. Opt. Soc. Am (1)

H. Osterberg, J. E. Wilkins, “The Resolving Power of a Coated Objective,” J. Opt. Soc. Am 39, 553–557 (1949).
[CrossRef]

J. Opt. Soc. Am. (1)

Postdeadline Digest, ISOM’87 (1)

H. Sukeda, M. Ojima, M. Takahashi, T. Maeda, “High Density Magneto-Optical Disk Using Highly Controlled Pit-Edge Recording,” in Postdeadline Digest, ISOM’87 (1987), paper FC1.

Proc. Soc. Photo-Opt. Instrum. Eng. (1)

G. Moore, “High Density Format For Sperry/Information Storage Inc. Second Generation Optical Drives,” Proc. Soc. Photo-Opt. Instrum. Eng. 695, 230–238 (1986).

Technical Digest, ISOM’87 (1)

T. Sekiguchi et al., “High Bit Rate Digital Video Recording Using Magneto-Optical Disks,” in Technical Digest, ISOM’87 (1987), paper FB4.

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Figures (13)

Fig. 1
Fig. 1

Optical system for superresolution.

Fig. 2
Fig. 2

Typical readout signal amplitude dependence on the recording power for a typical write-once recording medium.

Fig. 3
Fig. 3

Optical head design using superresolution.

Fig. 4
Fig. 4

Parameter values used for calculation and calculated spot size, main spot power, and sidelobe intensity dependence on the shading bandwidth.

Fig. 5
Fig. 5

Calculated readout signal amplitude with respect to recording frequency.

Fig. 6
Fig. 6

(a) Cross-sectional photograph of the superresolving spot; (b) spot profiles measured for various shading bandwidths.

Fig. 7
Fig. 7

Measured spot size and sidelobe intensity to main spot intensity ratio dependences on the shading width.

Fig. 8
Fig. 8

Observed beam images on (a) the front plane of the slit and (b) the back plane of the slit.

Fig. 9
Fig. 9

Measured CNR and 2nd/C dependences on recording power and shading and width. Reading was done using a normal spot.

Fig. 10
Fig. 10

Measured recording frequency characteristics without slit detection.

Fig. 11
Fig. 11

Measured recording frequency characteristics using slit detection.

Fig. 12
Fig. 12

Observed readout signal examples at 1 MHz using (a) superresolution spot with slit detection, (b) superresolution spot without slit detection, and a (c) normal spot.

Fig. 13
Fig. 13

Measured recording frequency characteristics using a visible light laser diode.

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