&lt;title&gt;50-mm CAD-MSR disk system with blue laser&lt;/title&gt;

Murakami, Y.; Nozaki, Takayuki; Ogata, Naoya; Takamori, Nobuyuki; Maeda, Shingo; Takahashi, Akira; Tanaka, Yasuhito; Muto, Y.; Nishida, M.; Kanno, Masayoshi; Nakaoki, Ariyoshi; Fujiie, Kazuhiko

doi:10.1117/12.453375

Cited by 2 publications

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“…In the field of optical disc storage devices, to obtain a much higher recording density beyond the resolution limit, the MSR method has been well known for practical disc systems. 1,2) On the other hand, in the field of read-only memory (ROM) discs, some studies on the super-resolution readout function have been carried out. [3][4][5] However, there are no practical super-resolution ROM technologies with a high readout stability.…”

Section: Introductionmentioning

confidence: 99%

Energy-Gap-Induced Super-Resolution (EG-SR) Optical Disc Using ZnO Interference Film

Mori¹,

Yamamoto²,

Tajima³

et al. 2005

Jpn. J. Appl. Phys.

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We have developed a super-resolution read-only memory (ROM) disc with a high readout stability using a zinc oxide (ZnO) thin film. Applying the reversible and repeatable change in the optical constants of ZnO induced by heat, we can successfully confirm super-resolution effects that can read out a small mark beyond the optical diffraction limit. By realizing this characteristic in a ROM disc, we obtained a linear bit density twofold higher than that of a conventional disc in the blue-laser optical system. To clarify the origin of ZnO super resolution, we performed two types of test: a test to compare ZnO super-resolution characteristics using blue- and red-laser optical systems, and a test to determine the relationship between the absorption edges of semiconductor films with various energy band gaps and readout laser wavelength.

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Section: Introductionmentioning

confidence: 99%

Energy-Gap-Induced Super-Resolution (EG-SR) Optical Disc Using ZnO Interference Film

Mori¹,

Yamamoto²,

Tajima³

et al. 2005

Jpn. J. Appl. Phys.

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Super-Resolution Optical Disc with High Readout Stability Using a Zinc Oxide Thin Film

Yamamoto¹,

Mori²,

Tajima³

et al. 2004

Jpn. J. Appl. Phys.

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The linear thermal expansion, AC susceptibility and magnetostriction have been measured on a single crystal of HoA12. Our results clearly show two phase transitions associated, respectively, with establishment of magnetic order and with spontaneous spin reorientation. The critical exponent ySR of the susceptibility for l-3 TSR has been determined. From magnetostriction measurements along the major symmetry directions of the crystal, we have obtained the possible deformation modes compatible with the point symmetry of the cubic crystal structure. A complete study of the magnetoelastic behaviour has allowed us to determine the reduced magnetoelastic coupling coefficients M : / C y , M i / C ' , M f / C " (I = 4,6)and D"/C".Themodelusedisbasedonasingle-ionorigin for the crystal electric field interaction of the rare-earth ion, and we have taken into account the spontaneous reorientation of the magnetic moment in the molecular field, which represents the exchange interaction.

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<title>50-mm CAD-MSR disk system with blue laser</title>

Cited by 2 publications

References 0 publications

Energy-Gap-Induced Super-Resolution (EG-SR) Optical Disc Using ZnO Interference Film

Energy-Gap-Induced Super-Resolution (EG-SR) Optical Disc Using ZnO Interference Film

Super-Resolution Optical Disc with High Readout Stability Using a Zinc Oxide Thin Film

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