Feasibility Study of High Density Land/Groove Recording on Magnetooptical Disks

Autor:	Toshifumi Kawano, Kyuya Narita, Hideharu Takeshima
Rok vydání:	1997
Předmět:	Birefringence Materials science business.industry General Engineering General Physics and Astronomy Laser law.invention Numerical aperture Wavelength Optics law visual_art Crosstalk cancellation visual_art.visual_art_medium Polymer substrate Polycarbonate business Jitter
Zdroj:	Japanese Journal of Applied Physics. 36:495
ISSN:	1347-4065 0021-4922
DOI:	10.1143/jjap.36.495
Popis:	Land/groove recording on a magnetooptical disk with polyolefin and polycarbonate substrates was demonstrated. The laser wavelength, numerical aperture of the objective lens and focused beam spot size were 680 nm, 0.55 and 1.15 µm, respectively. With a groove pitch of 1.3 µm, a carrier-to-noise ratio (CNR) of more than 45 dB with 0.6 µm mark length and crosstalk of less than -30 dB with 2.4 µm mark length were obtained. The effect of crosstalk cancellation in the polymer substrates was confirmed. Decreasing the vertical birefringence of the substrate improved the jitter and the CNR. The crosserase margin was 0.8 mW. It was identified that the CNR declined with the CNR phase shift.
Databáze:	OpenAIRE
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