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    42.
    发明专利
    未知

    公开(公告)号：DE2543869A1

    公开(公告)日：1976-04-29

    申请号：DE2543869

    申请日：1975-10-01

    Applicant: XEROX CORP

    Inventor： STREIFER WILLIAM ,  SCIFRES DONALD R ,  BURNHAM ROBERT D

    IPC: H01S5/00 ,  H01S5/12 ,  H01S3/05

    Abstract: A distributed feedback, (DFB) electrically pumped diode laser in which the spacing of the periodic structure within the diode is selected to optimize the interaction between the periodic structure and the electromagnetic waves in the diode laser. The degree to which the waves interact with the periodic structure is described mathematically by a coupling constant K, with larger values of K corresponding to lower gains required to produce laser operation. It is shown that in DFB diode lasers higher order transverse modes have a higher coupling constant K with the periodic structure than does the lowest order transverse mode and thus the higher order transverse modes will lase more easily than the lowest order transverse mode.

    43.
    发明专利
    未知

    公开(公告)号：DE2540159A1

    公开(公告)日：1976-04-22

    申请号：DE2540159

    申请日：1975-09-09

    Applicant: XEROX CORP

    Inventor： STREIFER WILLIAM ,  SCIFRES DONALD R ,  BURNHAM ROBERT D

    IPC: H01S5/00 ,  H01S5/042 ,  H01S5/187 ,  H01S3/05

    Abstract: A heterojunction diode laser which produces a highly collimated, polarized light beam perpendicular to the plane of the PN junction of the laser rather than through cleaved end faces in the plane of the PN junction. The diode laser includes a periodic structure which is buried at a heterojunction interface and in contact with a light waveguide layer. The periodic structure acts to produce the feedback necessary for lasing. If the spacing of the teeth of the periodic structure are an integer number of wavelengths of the light photons produced in the laser, the light beam exits at an angle perpendicular to the plane of the PN junction. If a tooth spacing is chosen that is not equal to an integer number of wavelengths of the light photons produced in the laser, the light beam may emerge from the diode at an angle other than the normal with the specific angle determined by the particular tooth spacing. To increase output intensity, the ends of the laser perpendicular to the plane of the PN junction and parallel to the teeth of the periodic structure may be cleaved and coated with a highly light reflective film.

    45.
    发明专利
    未知

    公开(公告)号：DE3688002T2

    公开(公告)日：1993-07-22

    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.

    46.
    发明专利
    未知

    公开(公告)号：DE3174573D1

    公开(公告)日：1986-06-12

    申请号：DE3174573

    申请日：1981-10-21

    Applicant: XEROX CORP

    Inventor： SCIFRES DONALD R ,  SPRAGUE ROBERT A

    IPC: G02F1/03 ,  G02F1/05 ,  G02F1/29

    Abstract: An electrooptical scanning device for deflection of an optical beam of light across an image plane. The device comprises a body of electrooptical crystal material and a periodic array of parallel, spaced electrodes associated with one surface of the body. A light beam entering the crystal body is caused to interact with electric fields established at the one surface by step applied voltages to the electrode array that influence the deflection of the light beam at the moment of total internal reflection at the one surface. By varying the magnitude of the applied voltages across the electrodes, a corresponding approximation of a desired phase retardation can be produced along the phase front of the light beam. The phase retardation across the light beam can be designed to produce a linear phase front angled beam or can be designed to produce a curvalinear phase front forming a focused spot at the image plane. With the changing of the magnitude of the applied voltages across the electrode array, the beam or spot may be made to move about or scan across the image plane.

    TRANSVERSE LIGHT EMITTING ELECTROLUMINESCENT DEVICES
    49.
    发明专利
    TRANSVERSE LIGHT EMITTING ELECTROLUMINESCENT DEVICES 未知

    公开(公告)号：CA1175537A

    公开(公告)日：1984-10-02

    申请号：CA359531

    申请日：1980-09-04

    Applicant: XEROX CORP

    Inventor： BURNHAM ROBERT D ,  SCIFRES DONALD R ,  STREIFER WILLIAM

    IPC: H01S5/00 ,  G02B6/42 ,  H01S5/183 ,  H01S5/343 ,  H01S5/42 ,  H01S3/19

    Abstract: Improved lateral carrier and optical confinement is achieved in heterostructure diodes and lasers having a Fabry-Perot cavity transverse to the plane of the p-n junction of the device. Structural features during fabrication improve carrier confinement to the active region in the established optical cavity. Current confinement means is also fabricated above and below the active region to concentrate the current density to the active region in the optical cavity and thereby improve the overall gain of the device. Such confinement also enhances optical confinement along the cavity. Several reflector structures are disclosed for employment at the cavity ends to provide optical feedback.

    HIGH OUTPUT POWER INJECTION LASERS
    50.
    发明专利
    HIGH OUTPUT POWER INJECTION LASERS 未知

    公开(公告)号：CA1166337A

    公开(公告)日：1984-04-24

    申请号：CA380303

    申请日：1981-06-22

    Applicant: XEROX CORP

    Inventor： SCIFRES DONALD R ,  BURNHAM ROBERT D ,  STREIFER WILLIAM

    IPC: H01S3/083

    Abstract: In a heterostructure injection laser having an active layer sandwiched by a pair of intermediate index layers, a very thin low refractive index and high bandgap may be employed between at least active layer and one intermediate layer or at least contiguous with a surface of at least one intermediate layer remote from the active layer. These thin layers may be applied in various positional combinations to produce desired effects on fundamental mode guiding.

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