Laser system for simultaneous texturing of two sides of a substr

Details Laser system for simultaneous texturing of two sides of a substr Laser system for simultaneous texturing of two sides of a substr

1997-03-28

1999-11-09

Evans, Geoffrey S.

Electric heating

Metal heating

By arc

21912168, 359305, 360135, B23K 2600, G02F 133

Patent

active

059819030

ABSTRACT:
A laser system is described which concurrently directs highly equivalent diffracted beams derived from an initial laser beam to both sides of a substrate. The diffracted beams may be generated with sufficient energy to soften spots on the surfaces of the substrate to form texture bumps as are used on substrates for magnetic disks. The diffracted beams are generated by a multichannel acousto-optic modulator (MCAOM) having at least two channels. The crystal in the MCAOM has at least two mounting faces oriented so that the acoustic transducers mounted thereon generate acoustic fields which intersect the incident laser beam at a common angle, i.e., the Bragg angle. Energizing any of the transducers causes a corresponding first order beam to be diffracted out. Preferably the diffracted beams are generated by alternating driving signals to transducers to produce two beams with pulse intensity greater than 50% of that of the incident beam which can be directed to opposite sides of a substrate for extremely uniform texturing.

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