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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 28, Iss. 20 — Oct. 15, 1989
  • pp: 4360–4365

Supersmall flying optical head for phase change recording media

Hiroo Ukita, Yoshitada Katagiri, and Susumu Fujimori  »View Author Affiliations


Applied Optics, Vol. 28, Issue 20, pp. 4360-4365 (1989)
http://dx.doi.org/10.1364/AO.28.004360


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Abstract

A supersmall optically switched laser (OSL) head is proposed. A laser diode attached to an air bearing slider forms a complex cavity together with a recording medium, and its light output is detected by a photodetector placed at the other end of the laser facet. Data signals and track error signals read from the sampled servo marks are successfully detected. The signal amplitude variation caused by the flying height change is much reduced, and the SNR is increased to 36 dB (40 kHz to 20 MHz for a phase change medium) by decreasing the reflectivity of the laser facet facing the medium to <5%.

© 1989 Optical Society of America

History
Original Manuscript: March 15, 1989
Published: October 15, 1989

Citation
Hiroo Ukita, Yoshitada Katagiri, and Susumu Fujimori, "Supersmall flying optical head for phase change recording media," Appl. Opt. 28, 4360-4365 (1989)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-28-20-4360


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References

  1. H. Ukita, Y. Katagiri, Y. Uenishi, “Readout Characteristics of Micro-Optical Head Operated in Bistable Mode,” Jpn. J. Appl. Phys. 26, Suppl. 26-4, 111–116 (1987).
  2. N. Fukushima, I. Sawaki, “Detection of Magneto-Optic Signal Using External Cavity Laser Diode,” in Technical Digest, Topical Meeting on Optical Data Storage (Optical Society of America, Washington, DC, 1989), pp. 55–58.
  3. Y. Uenishi, Y. Isomura, R. Sawada, H. Ukita, T. Toshima, “Beam Converging Laser Diode by Taper Ridged Waveguide,” Electron. Lett. 24, 623–624 (1988). [CrossRef]
  4. M. Ettenberg, H. S. Sommers, H. Kressel, H. F. Lockwood, “Control of Facet Damage in GaAs Laser Diodes,” Appl. Phys. Lett. 18, 571–573 (1971). [CrossRef]
  5. H. Ukita, K. Mise, Y. Katagiri, “Simple Measurement of the Reflectivity of Antireflection-Coated Laser Diode Facet,” Jpn. J. Appl. Phys. 27, L1128–L1130 (1988). [CrossRef]
  6. N. Tamaru, H. Hosaka, S. Hara, N. Funakoshi, K. Kogure, “A Study of a Flexible Optical Disk Drive,” in Technical Digest, Topical Meeting on Optical Data Storage (Optical Society of America, Washington, DC, 1989), pp. 59–62.
  7. S. Fujimori, S. Yagi, H. Yamazaki, N. Funakoshi, “Crystallization Process of Sb-Te Alloy Films for Optical Storage,” J. Appl. Phys. 64, 1000–1004 (1988). [CrossRef]
  8. B. I. Finkelstein, W. C. Williams, “Noise Sources in Magnetooptic Recording,” Appl. Opt. 27, 703–709 (1988). [CrossRef] [PubMed]

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