Laser texture apparatus using laser diode [hard disks]

Author

Mochida, M. ; Yamauchi, T. ; Arita, Y.

Author_Institution

Mitsubishi Chem. Corp., Yokohama, Japan

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

2376

Lastpage

2378

Abstract

A laser diode (LD) is used for a laser texture apparatus to form bumps on the Ni-P plated aluminum substrate for hard disks. The laser diode module of the apparatus comprises a LD, a collimator lens, a polarization beam splitter, a quarter wave plate and an objective lens for irradiating a pulsed laser beam on a surface on the substrate. The power of the LD is 300 mW and the numerical aperture of the objective lens is 0.8 for applying high power density. The shape of the bumps made by the apparatus is similar to that of the bumps made by laser texture apparatus comprising a high power continuous wave laser and an electro-optic modulator. The bump height is adjustable from 10 nm to 35 nm by changing the scanning length and the spindle speed

Keywords

hard discs; laser beam machining; optical beam splitters; optical collimators; semiconductor lasers; surface texture; 10 to 35 nm; 300 mW; NiP; bump height; bumps; collimator lens; hard disks; laser diode; laser texture apparatus; numerical aperture; objective lens; polarization beam splitter; pulsed laser beam; quarter wave plate; scanning length; spindle speed; Aluminum; Collimators; Diode lasers; Hard disks; Lasers and electrooptics; Lenses; Optical beam splitting; Optical retarders; Polarization; Power lasers;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800830

Filename

800830