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公开(公告)号：CA1155690A
公开(公告)日：1983-10-25
申请号：CA381053
申请日：1981-07-03
Applicant: IBM
Inventor： ALVAREZ DAVID C , BJORKLUND GARY C , BURLAND DONALD M
Abstract: PROCESS AND RECORDING MEDIA FOR CONTINUOUS WAVE FOUR-LEVEL, TWO-PHOTON HOLOGRAPHY A process and recording medium for four-level, twophoton holography are provided. These media are particularly useful for recording holograms using continuous wave lasers. The recording medium is formed by a transport resin containing a tetrazine compound. SA980006X
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公开(公告)号：CA1288156C
公开(公告)日：1991-08-27
申请号：CA571401
申请日：1988-07-07
Applicant: IBM
Inventor： BAUMERT JEAN-CLAUDE J E , BJORKLUND GARY C , LENTH WILFRIED , RISK WILLIAM P III , SCHELLENBERG FRANKLIN M
Abstract: WIDE TOLERANCE, MODULATED BLUE LASER SOURCE A process and apparatus are disclosed for producing a beam of coherent radiation at essentially 459 nm by mixing, in a nonlinear crystal consisting essentially of KTP, two laser beams, one at essentially 1064 nm and the other at essentially 808 nm. The 1064 nm radiation is derived from a Nd:YAG laser that consists of an input mirror, an output mirror and a Nd:YAG crystal, and contains also the KTP crystal. The Nd:YAG laser is pumped by an essentially 808 nm semiconductor diode laser beam, which passes through the input mirror and through the KTP crystal into the Nd:YAG laser crystal where it is absorbed. The 1064 nm radiation oscillating inside the Nd:YAG laser resonator is mixed either with the said 808 nm pump beam or with 808 nm radiation provided by a second semiconductor diode laser whose light is coupled with the 1064 nm beam using a beamsplitter. The essentially 459 nm beam passes through the output mirror to a utilization device.
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Patent Agency Ranking
公开(公告)号：CA1159690A
公开(公告)日：1984-01-03
申请号：CA388846
申请日：1981-10-27
Applicant: IBM
Inventor： BJORKLUND GARY C , SINCERBOX GLENN T
Abstract: TRANSMISSIVE HOLOGRAPHIC OPTICAL ELEMENT ON ABERRATING SUBSTRATE An inexpensive, high quality transmissive holographic optical element and method for making 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. SA9800277
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公开(公告)号：CA1270293A
公开(公告)日：1990-06-12
申请号：CA564157
申请日：1988-04-14
Applicant: IBM
Inventor： BJORKLUND GARY C
Abstract: MODULATED LASER SOURCE FOR OPTICAL STORAGE A time modulated source of frequency doubled laser radiation is described in which a non-linear crystal part of a stripline electrical circuit is mounted within a laser cavity so that the laser beam at a fundamental frequency impinges on and propagates through the non-linear crystal. A high bandwidth electrical data signal is coupled into the stripline electrical circuit to produce an electric field across the non-linear crystal so that an output beam is produced at a wavelength corresponding to the second harmonic of the fundamental frequency which represents a frequency doubled output beam modulated in accordance with the high bandwidth data signal. An alternate embodiment for producing the time modulated source of frequency doubled laser radiation has the non-linear crystal placed in a resonant microwave cavity. A high bandwidth electrical signal modulates the intensity of the microwave electric field across the non-linear crystal so that an output beam is produced at a wavelength corresponding to the second harmonic of the fundamental frequency which represents a frequency doubled output beam modulated in accordance with the high bandwidth data signal. SA986018
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公开(公告)号：CA1261468A
公开(公告)日：1989-09-26
申请号：CA530785
申请日：1987-02-27
Applicant: IBM
Inventor： BJORKLUND GARY C , CHEN MARTIN Y , JIPSON VICTOR B
Abstract: THERMAL DESIGN FOR REVERSIBLE PHASE CHANGE OPTICAL STORAGE MEDIA Reversible phase change storage material is thermally isolated in a storage medium by means of grooves in the substrate and at least one layer of a thermally conductive dielectric material.
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6.发明专利
公开(公告)号：CA1208930A
公开(公告)日：1986-08-05
申请号：CA457031
申请日：1984-06-20
Applicant: IBM
Inventor： BJORKLUND GARY C , LEVENSON MARC D
Abstract: FREQUENCY MODUEATION-POLARIZATION SPECTROSCOPY METHOD AND DEVICE FOR DETECTING SPECTRAL FEATURES A method and device for detecting dichroic and/or birefringent narrow spectral features in a sample is described. The method includes the steps of providing a beam of light having an optical frequency bandwidth which is narrow compared to the width of the narrow spectral feature and having a center frequency .omega.c which lies near the narrow spectral feature, polarization phase modulating a beam of light with a single RF frequency to provide a pure FM spectrum having upper and lower sidebands in which either the carrier and sidebands have been polarized differently with respect to one another, exposing the sample containing the narrow spectral feature to the polarized modulated light so that the FM sidebands probe the narrow spectral feature, polarization analyzing and then photodetecting the light emerging from the sample to detect a RF beat at the specific RF frequency used for the polarization phase modulation, and electronically monitoring the amplitude of the RF beat signal to indicate the strength of the narrow spectral feature. The device includes a polarization phase modulator and a polarization analyzer positioned on opposite sides of the sample. In a preferred embodiment the polarization phase modulator produces a frequency modulated optical spectrum with the sidebands polarized precisely orthogonal to the carrier.
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公开(公告)号：CA1137328A
公开(公告)日：1982-12-14
申请号：CA356676
申请日：1980-07-22
Applicant: IBM
Inventor： BJORKLUND GARY C
Abstract: A METHOD AND DEVICE FOR DETECTING A SPECIFIC SPECTRAL FEATURE A method and device for detecting a narrow spectral feature in a sample is described. The method includes the steps of providing a beam of light having an optical frequency bandwidth which is narrow compared to the width of the narrow spectral feature and having a center frequency .omega.C which lies near the narrow spectral feature, phase modulating the beam of light with a single RF frequency to provide a pure FM spectrum having upper and lower sidebands, exposing the sample containing the narrow spectral feature to the modulated light so that only one of the FM sidebands probes the narrow spectral feature, photodetecting the light emerging from the sample to detect a RF beat at the specific RF frequency used for phase modulation, and electronically monitoring the amplitude of the RF beat signal to indicate the strength of the narrow spectral feature. A preferred embodiment of this invention is a multiplex readout device for hole burning memories. The device includes means for using a frequency modulated laser light with widely spaced sidebands arranged so that only one of each pair of upper and lower sidebands probes the frequency location of each hole. The device uses many simultaneous RF frequencies to drive the phase modulator and produce the light with FM sidebands which SA979028 simultaneously probes all the hole locations of interest. The device includes photodetection means to receive the light after it has passed through the sample and phase sensitive multiplex analyzing means to process the electrical signals from the photodetection means to indicate the presence or absence of holes. SA979028
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