High-density SHG laser readout with Pt/Co MO disk

Masahiko Takahashi; Junko Nakamura; Masahiro Ojima; Kimio Tatsuno

doi:10.1117/12.137549

13 August 1992 High-density SHG laser readout with Pt/Co MO disk

Masahiko Takahashi, Junko Nakamura, Masahiro Ojima, Kimio Tatsuno

Proceedings Volume 1663, Optical Data Storage; (1992) https://doi.org/10.1117/12.137549
Event: Optical Data Storage Topical Meeting, 1992, San Jose, CA, United States

Abstract

To increase the recording bit density of a magneto-optical disk using a shorter-wavelength laser, readout characteristics of disks with Pt/Co multilayered films were investigated by using a 532 nm SHG laser. The experiment using a (lambda) /4 - (lambda) /2 plate differential detection system showed that the disk noise of the Pt/Co disk was caused by a fluctuation of Kerr rotation angle, and that this noise component was reduced by sputter etching the surface of a SiN under-layer. A C/N ratio greater than 40 dB with a 0.45 micrometers domain length was obtained from this noise-suppressed Pt/Co disk.

Citation Download Citation

Masahiko Takahashi, Junko Nakamura, Masahiro Ojima, and Kimio Tatsuno "High-density SHG laser readout with Pt/Co MO disk", Proc. SPIE 1663, Optical Data Storage, (13 August 1992); https://doi.org/10.1117/12.137549

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