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公开(公告)号：JPH10275341A
公开(公告)日：1998-10-13
申请号：JP7425498
申请日：1998-03-23
Applicant: IBM
Inventor： BAUMGART PETER MICHAEL , BRANNON JAMES HAMMOND , POON CHIE CHING , POUR IRAJ KAKESH , TAM ANDREW C
Abstract: PROBLEM TO BE SOLVED: To provide a laser device capable of directing diffracted beams generated from initial laser beam and having high equality toward both surfaces of a substrate simultaneously. SOLUTION: Diffracted beams are generated with energies sufficient to form texture bumps to be used on the substrate of a magnetic disk 95 by softening spots being on surfaces of the substrate. The beams are generated by a multichannel acoustic optical modulator (MCAOM) which has at least two channels (here, two channel modulator (DCAOM)). The crystal of the MCAOM has at least two mounting surfaces oriented so as to intersect an incident laser beam 16 at a common angle, that is, a Bragg angle (α). A corresponding 1-st order beam 16 is diffracted (14a, 14b) by activating arbitrary modulators 13a, 13b. The diffracted beams are preferably generated by generating two beams whose pulse intensities exceed 50% of the incident beam and which can be directed toward counter surfaces of the substrate in order to uniformize textures extremely while alternating driving signals to the modulators.
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公开(公告)号：DE69806198T2
公开(公告)日：2003-01-30
申请号：DE69806198
申请日：1998-03-09
Applicant: IBM
Inventor： BAUMGART PETER MICHAEL , BRANNON JAMES HAMMOND , POON CHIE CHING , POUR IRAJ KAKESH , TAM ANDREW CHING
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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公开(公告)号：DE69806198D1
公开(公告)日：2002-08-01
申请号：DE69806198
申请日：1998-03-09
Applicant: IBM
Inventor： BAUMGART PETER MICHAEL , BRANNON JAMES HAMMOND , POON CHIE CHING , POUR IRAJ KAKESH , TAM ANDREW CHING
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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公开(公告)号：SG68651A1
公开(公告)日：1999-11-16
申请号：SG1998000466
申请日：1998-03-02
Applicant: IBM
Inventor： BAUMGART PETER MICHAEL , BRANNON JAMES HAMMOND , BOON CHIE CHING , POUR IRAJ KAKESH , TAM ANDREW CHING
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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