Title :
Laser texture apparatus using laser diode [hard disks]
Author :
Mochida, M. ; Yamauchi, T. ; Arita, Y.
Author_Institution :
Mitsubishi Chem. Corp., Yokohama, Japan
fDate :
9/1/1999 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
