Abstract

Single-mode optical fibers with photoresist lenses open some new design options for read and write heads for optical disks. Possible advantages include the use of flying heads to eliminate the focus servo system, simplification of the tracking servo system, elimination of many discrete, precisely aligned optical components, and separation of light paths by the read/write function. Parallel write beams become feasible to increase data transfer rates. Properties of the photoresist lenses on single-mode fibers are reviewed, and the application to tracking and reading data on various optical disk types is considered.

© 1986 Optical Society of America

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References

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  1. K. S. Lee, F. S. Barnes, “Microlenses on the End of Single-Mode Optical Fibers for Laser Applications,” Appl. Opt. 24, 3134 (1985).
    [CrossRef] [PubMed]
  2. A. D. Pearson, Ed., Single Mode Optical Fibers, Proc. Soc. Photo-Opt. Instrum. Eng.425 (1983).
  3. G. Cancellieri, U. Ravaiola, Measurements of Optical Fibers and Devices: Theory and Experiments (Artech House, Dedham, MA, 1984).

1985 (1)

Barnes, F. S.

Cancellieri, G.

G. Cancellieri, U. Ravaiola, Measurements of Optical Fibers and Devices: Theory and Experiments (Artech House, Dedham, MA, 1984).

Lee, K. S.

Ravaiola, U.

G. Cancellieri, U. Ravaiola, Measurements of Optical Fibers and Devices: Theory and Experiments (Artech House, Dedham, MA, 1984).

Appl. Opt. (1)

Other (2)

A. D. Pearson, Ed., Single Mode Optical Fibers, Proc. Soc. Photo-Opt. Instrum. Eng.425 (1983).

G. Cancellieri, U. Ravaiola, Measurements of Optical Fibers and Devices: Theory and Experiments (Artech House, Dedham, MA, 1984).

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Figures (4)

Fig. 1
Fig. 1

Optical fiber read/write head using directional couplers, a flying slider at the disk, and separate read and write lasers.

Fig. 2
Fig. 2

SEM photographs of photoresist lenses: (a) hemispherical lens with 3.3-μm thickness and 12-μm diameter; (b) hemispherical-ended long lens with 5.3-μm thickness and 3.0-μm radius of curvature. Profiles are modified by tilt of sample in SEM.

Fig. 3
Fig. 3

Scan of grating using optical fiber–photoresist lens combination: (a) grating with 20-μm period; (b) scan signal at 633-nm wavelength.

Fig. 4
Fig. 4

Tracking signals: (a) spatial discriminator from difference of signals at two offset tracking spots on intensity contrast medium; (b) spatial discriminator from single spot on pregrooved disk (phase step).

Tables (1)

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Table I Typical Microlens Specifications and Characteristics (at λ = 830 nm)

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