Optical Disk Recording Using a GaN Blue-Violet Laser Diode

Autor:	Kiyoshi Osato, Isao Ichimura, Kenji Yamamoto, Fumisada Maeda, Yutaka Kasami
Rok vydání:	2000
Předmět:	Blue laser Materials science Laser diode business.industry General Engineering General Physics and Astronomy Optical storage law.invention Semiconductor laser theory Numerical aperture Optics law Optical recording Optoelectronics business Optical disc Diode
Zdroj:	Japanese Journal of Applied Physics. 39:937
ISSN:	1347-4065 0021-4922
DOI:	10.1143/jjap.39.937
Popis:	The combination of a GaN laser diode and a 0.85 numerical aperture objective has achieved an optical storage capacity of over 22 GB. Owing to sufficient modulation ability and low-noise characteristics, GaN semiconductor lasers possess adequate quality to be light sources in optical recording systems. A bit size of 130 nm×300 nm, corresponding to the areal recording density of 16.5 Gbit/in.2, was realized on a six-layered thin-cover phase-change disk with a crystallization-promoting structure. Each active layer was inversely stacked and was thermally as well as optically optimized for the blue-violet light sources. A new small electromagnetic actuator with a lightweight φ3 mm two-element lens has extended its servo-bandwidth up to 8 kHz and enabled precise focusing control at the data transfer rate of 35 Mbps.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::66782e25c830327dacc1c2540e2fa8a5 https://doi.org/10.1143/jjap.39.937 Zobrazit plný text záznamu