An Optically Switched Laser(OSL) Head For Optical Recording

Hiroo Ukita; Yoshihiro Isomura; Hidenao Tanaka

doi:10.1117/12.961787

28 September 1989 An Optically Switched Laser(OSL) Head For Optical Recording

Hiroo Ukita, Yoshihiro Isomura, Hidenao Tanaka

Proceedings Volume 1139, Optical Storage and Scanning Technology; (1989) https://doi.org/10.1117/12.961787
Event: 1989 International Congress on Optical Science and Engineering, 1989, Paris, France

Abstract

A flying type optical head on an air bearing slider is proposed for phase-change recording media. Data signals are detected as light output switched by the light reflected back from the medium. The head consists of a beam-converging laser diode and a photodetector. The full widths at the half-maximum of the near field pattern of the laser diode are 0.8 μm and 1 μm. This paper clarifies the head signal detection mechanism. Signal amplitude variation due to the flying height change is reduced to less than 30% and signal-to-noise ratio is sufficiently increased by decreasing the reflectivity of the laser facet facing the medium to less than 5%. Furthermore, OSL head track error signal using the sampled servo method is successfully detected.

Citation Download Citation

Hiroo Ukita, Yoshihiro Isomura, and Hidenao Tanaka "An Optically Switched Laser(OSL) Head For Optical Recording", Proc. SPIE 1139, Optical Storage and Scanning Technology, (28 September 1989); https://doi.org/10.1117/12.961787

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