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公开(公告)号：DE3688002D1
公开(公告)日：1993-04-22
申请号：DE3688002
申请日：1986-05-27
Applicant: XEROX CORP
Inventor： BURNHAM ROBERT D , PAOLI THOMAS L , SCIFRES DONALD R , STREIFER WILLIAM
IPC: H01S5/00 , H01S5/062 , H01S5/0625 , H01S5/10 , H01S5/20 , H01S5/40 , H01S3/19 , H01S3/18 , H01L33/00 , H01S3/085 , H01S3/101 , H01S3/103 , H01S3/25
Abstract: A hybrid index/gain-guided semiconductor laser (10) has a gain guide type body with index waveguide attributes characterised by having two regions of current confinement means. The first of these regions contains primary current confinement means and at least one second region which includes a pair of current confinement means parallel to each other and axially offset relative to the axis of the primary current confinement means and extend from the other laser facet toward the first region. The axially offset current confinement means in the second region provides regions of lower refractive index in the laser structure compared to the region of the laser optical cavity established between the offset current confinement means and, as a result, function as an index optical waveguide for the laser. The first region may be electrically isolated from the second region so that the first region is independently pumped relative to the second region. By varying the pumping current to the regions of the axially-offset current confinement means, one can selectively change the refractive index differences established between the axially offset current confinement means regions and the optical cavity region therebetween. The primary and offset current confinement geometry may be utilized in single or multuple element lasers.
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公开(公告)号：DE3477715D1
公开(公告)日：1989-05-18
申请号：DE3477715
申请日：1984-01-13
Applicant: XEROX CORP
Inventor： SCIFRES DONALD R , STREIFER WILLIAM , BURNHAM ROBERT D
Abstract: A semiconductor laser has a combination index- and gain-guiding region in the optical cavity (18) established between end facets (27, 28) of the laser.
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公开(公告)号：DE3278829D1
公开(公告)日：1988-09-01
申请号：DE3278829
申请日：1982-12-03
Applicant: XEROX CORP
Inventor： SPRAGUE ROBERT A , SCIFRES DONALD R
Abstract: An optical cursor control device or "optical mouse" (10) is disclosed for use with an interactive, display oriented computer system to provide movement for a visible cursor from position to position on a display screen of such a system. The cursor control device (10) provides an output indicative of the amount and direction of movement of the device relative to an orthogonal coordiante system. The device relies on a planar grid pattern (18) comprising orthogonally positioned grid lines (19) of uniform spacing, one line (19) and spacing (20) defining a grid period Means (12) is provided to illuminate at least a portion of the grid pattern. Sensor array means (14, 16) comprising optical transducers are provided for each orthogonal direction. Each optical transducer (14, 16) has an elongated radiation detecting area (15,17) to receive radiation from an elongated radiation collecting area (22) at the plane of said grid pattern (18). The length of the radiation collecting area of each transducer is equal to or greater than a grid period and the width of these areas is equal to or narrower than the width of one half of the grid period.
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公开(公告)号：CA1208466A
公开(公告)日：1986-07-29
申请号：CA429259
申请日：1983-05-31
Applicant: XEROX CORP
Inventor： SCIFRES DONALD R , SPRAGUE ROBERT A
Abstract: An optical system for collimating the radiation from a semiconductor laser, the laser near field having a single beam waist position in a first direction and having an elongated but phase coherent near field emitting pattern in a second direction which forms a far field low divergence beam pattern, the optical system characterized by a lens system for imaging said near field of said single beam waist position in the first spatial direction while imaging the elongated, phase coherent far field radiation pattern in the second direction. The laser is a multi-emitter or broad emitter semiconductor laser capable of producing one or more output beams. The lens system may include focusing optics of focus radiation in the near field pattern emitted from the laser in the first direction and in the far field pattern of radiation emitted from the laser in the second direction.
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公开(公告)号：CA1173573A
公开(公告)日：1984-08-28
申请号：CA414336
申请日：1982-10-27
Applicant: XEROX CORP
Inventor： SPRAGUE ROBERT A , SCIFRES DONALD R
Abstract: An optical cursor control device or "optical mouse" is disclosed for use with an interactive, display oriented computer system to provide movement for a visible cursor from position to position on a display screen of such a system. The cursor control device provides an output indicative of the amount and direction of movement of the device relative to an orthogonal coordinate system. The device relies on a planar grid pattern comprising orthogonally positioned grid lines of uniform spacing, one line and spacing defining a grid period. Means is provided to illuminate at least a portion of the grid pattern. Sensor array means comprising optical transducers are provided for each orthogonal direction. Each optical transducer has an elongated radiation detecting area to receive radiation from an elongated radiation collecting area at the plane of said grid pattern. The length of the radiation collecting area of each transducer is equal to or greater than a grid period and the width of these areas is equal to or narrower than the width of one half of the grid period.
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Patent Agency Ranking
公开(公告)号：DE2965803D1
公开(公告)日：1983-08-04
申请号：DE2965803
申请日：1979-10-30
Applicant: XEROX CORP
Inventor： SCIFRES DONALD R , STREIFER WILLIAM , BURNHAM ROBERT D
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公开(公告)号：CA1132695A
公开(公告)日：1982-09-28
申请号：CA328067
申请日：1979-05-22
Applicant: XEROX CORP
Inventor： SCIFRES DONALD R , STREIFER WILLIAM , BURNHAM ROBERT D
Abstract: BEAM SCANNING USING RADIATION PATTERN DISTORTION A laser beam scanner in which a single-lobe propogates radiation pattern through an electrically variable asymmetric electrical charge distribution. Because the electrical charge distribution determines the real and imaginary parts of the refractive index of the material through which the radiation pattern propogates the radiation pattern may be deflected by changing the charge distribution profile.
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公开(公告)号：FR2493616A1
公开(公告)日：1982-05-07
申请号：FR8120291
申请日：1981-10-29
Applicant: XEROX CORP
Inventor： SCIFRES DONALD R , STREIFER WILLIAM , BURNHAM ROBERT D
Abstract: Heterostructure injection lasers include a combination optically coupled active and passive waveguide means forming an optically confining channel or strip between end facets. A passive or transparent waveguide means in the vicinity of the laser facets optically confines the radiation thereto in both dimensions transverse to the direction of propagation. The passive means is coupled to an active region of the laser which also optically confines the propagating radiation to the active region in both dimensions transverse to the direction of propagation. The active strip does not extend to the end facets of the laser. The combination active and passive means provides for high power, low divergence output beam, fundamental transverse mode control, lower operational current thresholds and the substantial elimination of laser astigmatism found in strip buried heterostructure lasers.
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公开(公告)号：FR2461380A1
公开(公告)日：1981-01-30
申请号：FR8015474
申请日：1980-07-11
Applicant: XEROX CORP
Inventor： SCIFRES DONALD R , BURNHAM ROBERT D , STREIFER WILLIAM
Abstract: A laser array comprised of a plurality of stacked emitting or active regions which are in sufficiently close contact to each other that light from each active region is coupled to the light from the adjacent active regions to form a phase-locked laser array with low composite beam divergence perpendicular to the plane of the rectifying junction of the active regions.
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公开(公告)号：CA1058308A
公开(公告)日：1979-07-10
申请号：CA246384
申请日：1976-02-23
Applicant: XEROX CORP
Inventor： SCIFRES DONALD R , BURNHAM ROBERT D
Abstract: A laser having layers of a first material interleaved with layers of a second material with the first material having a different index of refraction and bandgap than those of the second material. The thicknesses of the layers of the first and second materials satisfy the relationship t = where m is the laser mode and n is the index of refraction of the material, such that the right and left going waves of the light produced by the layers of the first material when the laser is pumped are coupled and reinforced in a coherent manner by the layers of the second material such that reflections from the second material are in phase, thus allowing laser operation in the absence of discrete end mirrors.
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