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公开(公告)号：JPS6280847A
公开(公告)日：1987-04-14
申请号：JP16822286
申请日：1986-07-18
Applicant: IBM
Inventor： SCHECHTMAN BARRY HERMAN , BJORKLUND GARY CARL , BELL ALAN EDWARD
IPC: G11B11/10 , G03G5/16 , G11B5/66 , G11B11/105
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公开(公告)号：DE3372031D1
公开(公告)日：1987-07-16
申请号：DE3372031
申请日：1983-02-01
Applicant: IBM
Inventor： BJORKLUND GARY CARL , BURLAND DONALD MAXWELL
IPC: G11B7/00 , G03C1/73 , G03H1/02 , G11B7/0045 , G11B7/0065 , G11B7/26 , G03C1/72
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公开(公告)号：DE3165628D1
公开(公告)日：1984-09-27
申请号：DE3165628
申请日：1981-03-19
Applicant: IBM
Inventor： BJORKLUND GARY CARL
Abstract: An optical pulse shaping device and methhod of shaping an optical pulse involves the use of a phase coherent multi-frequency light beam with an optical element consisting of a sample containing an absorption band with multiple holes. The holes are burned into the sample to selected depths at selected frequency locations, thereby permitting the relative phases and amplitudes of the input frequency components of the beam to be independently varied to arbitrary values. This system enables a generalized Fourier synthesis of optical pulses such as a laser with designed temporal profiles to be effected.
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公开(公告)号：DE3781304T2
公开(公告)日：1993-04-08
申请号：DE3781304
申请日：1987-02-27
Applicant: IBM
Inventor： BJORKLUND GARY CARL , CHEN MARTIN YU-WEN , JIPSON VICTOR BURR
Abstract: An optical storage medium comprising a substrate having lands and grooves, a reversible phase change active layer above the substrate, and at least one thermally conductive dielectric layer, either between the substrate and the active layer or on top of the active layer, with the grooves in the substrate being of sufficient depth to provide thermal isolation between adjacent lands and grooves.
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公开(公告)号：DE3170009D1
公开(公告)日：1985-05-23
申请号：DE3170009
申请日：1981-10-05
Applicant: IBM
Inventor： BJORKLUND GARY CARL , SINCERBOX GLENN TAVERNIA
Abstract: An inexpensive, high quality transmissive holographic optical element and method for making same are described. The holographic optical element consists of a potentially aberrating substrate which supports a layer of holographic recording material. The material contains a recorded fringe pattern that cancels the aberrations induced in an image wavefront as it passes through the aberrating substrate. This optical element is formed by a method having the following steps. A first wavefront from a source, for example a point focus, is passed through the aberrating substrate, becomes distorted, and then passes through the holographic recording material to a wavefront conjugator. The conjugator launches a conjugate of the distorted wavefront back to the holographic recording material. A second wavefront is then passed through the holographic recording material to form a fringe pattern or hologram as a result of the interference of the conjugate waveform and the second waveform. Subsequently, the developed holographic optical element is illuminated with a reconstruction wave which is the duplicate of the reference wave. Passage of this reconstruction wave through the holographic layer results in an emerging wavefront identical to the conjugated distorted wavefront which is then converted to the original wavefront as it passes through the aberrating substrate.
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Patent Agency Ranking
公开(公告)号：DE3781304D1
公开(公告)日：1992-10-01
申请号：DE3781304
申请日：1987-02-27
Applicant: IBM
Inventor： BJORKLUND GARY CARL , CHEN MARTIN YU-WEN , JIPSON VICTOR BURR
Abstract: An optical storage medium comprising a substrate having lands and grooves, a reversible phase change active layer above the substrate, and at least one thermally conductive dielectric layer, either between the substrate and the active layer or on top of the active layer, with the grooves in the substrate being of sufficient depth to provide thermal isolation between adjacent lands and grooves.
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公开(公告)号：DE3071334D1
公开(公告)日：1986-02-20
申请号：DE3071334
申请日：1980-07-24
Applicant: IBM
Inventor： BJORKLUND GARY CARL
Abstract: This invention is directed to a method and apparatus apparatus for detecting one or more spectral features in a sample (16). The method for detecting a single narrow spectral feature in a sample includes the steps of providing a beam of light (10) having an optical frequency bandwidth which is narrow compared to the width of the narrow spectral feature and having a centre frequency omega c which lies near the narrow spectral feature, phase modulating (12) the beam of light with a single RF frequency to provide a pure FM spectrum having upper and lower sidebands, exposing the sample (16) containing the narrow spectral feature to the modulated light so that only one of the FM sidebands probes the narrow spectral feature, photodetecting (18) the light emerging from the sample to detect a RF beat at the specific RF frequency used for phase modulation, and electronically monitoring (20) the amplitude of the RF beat signal to indicate the strength of the narrow spectral feature. A preferred embodiment of the invention is an apparatus for multiplex readout of information encoded by the presence or absence of photochemical holes burned in an inhomogeneous absorption band of a sample (16). The apparatus includes means (10, 12, 14) for using a frequency modulated laser light with widely spaced sidebands arranged so that only one of each pair of upper and lower in sidebands probes the frequency location of each hole. The apparatus uses many simultaneous RF frequencies to drive the phase modulator (12) and produce the light with FM sidebands which simultaneously probes all the hole locations of interest. The apparatus includes photodetection means (18) to receive the light after it has passed through the samples and phase sensitive multiplex analyzing means (20) to process the electrical signals from the photodetection means to indicate the presence or absence of holes.
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