Title:
【発明の名称】レーザー装置及びその操作方法
Document Type and Number:
Japanese Patent JP3334749
Kind Code:
B2
Abstract:
A laser system concurrently directs highly equivalent diffracted beams (14a,14b) derived from an initial laser beam (16) to both sides of a substrate. The diffracted beams are generated with sufficient energy to soften spots on the surfaces of a substrate (95) 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 (12) in the MCAOM has at least two mounting faces oriented so that the acoustic transducers (13a,13b) mounted thereon generate acoustic fields which intersect the incident laser beam at a common angle. i.e.. the Bragg angle. Energising 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 the substrate (95) for extremely uniform texturing.
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Inventors:
Peter Michael Baumgard
James Hammond Brannon
Chii Chin Poon
Iraj Kakesh Pore
Andrew Chin Tam
James Hammond Brannon
Chii Chin Poon
Iraj Kakesh Pore
Andrew Chin Tam
Application Number:
JP7425498A
Publication Date:
October 15, 2002
Filing Date:
March 23, 1998
Export Citation:
Assignee:
INTERNATIONAL BUSINESS MASCHINES CORPORATION
International Classes:
G02F1/11; G02F1/33; G11B5/84; G11B7/085; G11B7/135; (IPC1-7): G11B5/84; G02F1/11; G11B7/085; G11B7/135
Domestic Patent References:
| JP7182655A | ||||
| JP8227521A | ||||
| JP56151914A | ||||
| JP8194197A | ||||
| JP58132731A |
Other References:
【文献】米国特許5138482(US,A)
【文献】米国特許3609009(US,A)
【文献】米国特許3609009(US,A)
Attorney, Agent or Firm:
Hiroshi Sakaguchi (1 person outside)