29 September 1994 Relationship between cross-talk and birefringence on 1.3-GB-130-mm magneto-optical disk
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Abstract
It is important to control the cross-talk that decreases the write/read window margin on the 1.3 GB - 130 mm MO disk, since the recording track is adjacent to the embossed pits of the header. We think this cross-talk is caused by two effects, one is the diffraction of the reflected light by the adjacent embossed pits and the other is `micro-birefringence' which exists in a local stress field around the embossed pits. We analyzed theoretically the relation between the micro-birefringence effects and macro-birefringence in a PC substrate, using a simple model of the micro-birefringence. The result shows that the cross-talk value depends on both vertical and in-plane macro-birefringences of the substrate. The combinations of the vertical and in- plane birefringences that make the maximum MO signal, don't make minimum cross-talk. Since the cross-talk is enhanced by the macro birefringence, only a narrow region of the vertical and in-plane birefringence are available to get the high quality of the MO signal-to- cross-talk ratio.
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Yoshiyuki Kaneda, Yoshiyuki Kaneda, Yasuaki Nakane, Yasuaki Nakane, Yoshihito Fukushima, Yoshihito Fukushima, } "Relationship between cross-talk and birefringence on 1.3-GB-130-mm magneto-optical disk", Proc. SPIE 2297, Photonics for Processors, Neural Networks, and Memories II, (29 September 1994); doi: 10.1117/12.187321; https://doi.org/10.1117/12.187321
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