Patents by Inventor David S. McCallum
David S. McCallum has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9356162Abstract: The present application utilizes an oxidation process to fabricating a Group III-V compound semiconductor solar cell device. By the oxidation process, a window layer disposed on a cell unit is oxidized to enhance the efficiency of the solar cell device. The oxidized window has an increased band gap to minimize the surface recombination of electrons and holes. The oxidized window also improves transparency at the wavelengths that were absorbed in the conventional window layer.Type: GrantFiled: January 28, 2010Date of Patent: May 31, 2016Assignee: MicroLink Devices, Inc.Inventors: Noren Pan, Christopher Youtsey, David S. McCallum, Victor C. Elarde, John M. Dallesasse
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Publication number: 20120227798Abstract: The present application utilizes an oxidation process to fabricating a Group III-V compound semiconductor solar cell device. By the oxidation process, a window layer disposed on a cell unit is oxidized to enhance the efficiency of the solar cell device. The oxidized window has an increased band gap to minimize the surface recombination of electrons and holes. The oxidized window also improves transparency at the wavelengths that were absorbed in the conventional window layer.Type: ApplicationFiled: May 29, 2012Publication date: September 13, 2012Applicant: MICROLINK DEVICES, INC.Inventors: Noren PAN, Christopher YOUTSEY, David S. MCCALLUM, Victor C. ELARDE, John M. DALLESASSE
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Patent number: 7949028Abstract: An array of optically coupled cavities (called micro-cavities) of a semiconductor laser are defined by either an etch and/or by a native oxide of an aluminum-bearing III-V semiconductor material and are arranged serially end-to-end along the longitudinal direction. An etch and/or native oxide defines a refractive index change for the longitudinal optical mode and confines the optical field within the micro-cavities, resulting in reflection and optical feedback distributed periodically along the laser stripe in the form of an optically coupled micro-cavity. The wavelength of emission of the laser is controlled by a combination of the length of the optical micro-cavities and the spacing between adjacent optical micro-cavities. Single-longitudinal-mode operation is exhibited over an extended drive current range. In one embodiment, two or more linear arrays of end-coupled micro-cavities are arranged in the longitudinal axis of the laser cavity to obtain a tunable laser.Type: GrantFiled: October 1, 2010Date of Patent: May 24, 2011Assignee: Vega Wave Systems, Inc.Inventors: Alan R. Sugg, David S. McCallum
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Patent number: 7949029Abstract: An array of optically coupled cavities (called micro-cavities) of a semiconductor laser are defined by either an etch and/or by a native oxide of an aluminum-bearing III-V semiconductor material and are arranged serially end-to-end along the longitudinal direction. An etch and/or native oxide defines a refractive index change for the longitudinal optical mode and confines the optical field within the micro-cavities, resulting in reflection and optical feedback distributed periodically along the laser stripe in the form of an optically coupled micro-cavity. The wavelength of emission of the laser is controlled by a combination of the length of the optical micro-cavities and the spacing between adjacent optical micro-cavities. Single-longitudinal-mode operation is exhibited over an extended drive current range. In one embodiment, two or more linear arrays of end-coupled micro-cavities are arranged in the longitudinal axis of the laser cavity to obtain a tunable laser.Type: GrantFiled: October 1, 2010Date of Patent: May 24, 2011Assignee: Vega Wave Systems, Inc.Inventors: Alan R. Sugg, David S. McCallum
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Publication number: 20110019702Abstract: An array of optically coupled cavities (called micro-cavities) of a semiconductor laser are defined by either an etch and/or by a native oxide of an aluminum-bearing III-V semiconductor material and are arranged serially end-to-end along the longitudinal direction. An etch and/or native oxide defines a refractive index change for the longitudinal optical mode and confines the optical field within the micro-cavities, resulting in reflection and optical feedback distributed periodically along the laser stripe in the form of an optically coupled micro-cavity. The wavelength of emission of the laser is controlled by a combination of the length of the optical micro-cavities and the spacing between adjacent optical micro-cavities. Single-longitudinal-mode operation is exhibited over an extended drive current range. In one embodiment, two or more linear arrays of end-coupled micro-cavities are arranged in the longitudinal axis of the laser cavity to obtain a tunable laser.Type: ApplicationFiled: October 1, 2010Publication date: January 27, 2011Applicant: VEGA WAVE SYSTEMS, INC.Inventors: Alan R. Sugg, David S. McCallum
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Publication number: 20110019703Abstract: An array of optically coupled cavities (called micro-cavities) of a semiconductor laser are defined by either an etch and/or by a native oxide of an aluminum-bearing III-V semiconductor material and are arranged serially end-to-end along the longitudinal direction. An etch and/or native oxide defines a refractive index change for the longitudinal optical mode and confines the optical field within the micro-cavities, resulting in reflection and optical feedback distributed periodically along the laser stripe in the form of an optically coupled micro-cavity. The wavelength of emission of the laser is controlled by a combination of the length of the optical micro-cavities and the spacing between adjacent optical micro-cavities. Single-longitudinal-mode operation is exhibited over an extended drive current range. In one embodiment, two or more linear arrays of end-coupled micro-cavities are arranged in the longitudinal axis of the laser cavity to obtain a tunable laser.Type: ApplicationFiled: October 1, 2010Publication date: January 27, 2011Applicant: VEGA WAVE SYSTEMS, INC.Inventors: Alan R. Sugg, David S. McCallum
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Patent number: 7830941Abstract: An array of optically coupled cavities (called micro-cavities) of a semiconductor laser are defined by either an etch and/or by a native oxide of an aluminum-bearing III-V semiconductor material and are arranged serially end-to-end along the longitudinal direction. An etch and/or native oxide defines a refractive index change for the longitudinal optical mode and confines the optical field within the micro-cavities, resulting in reflection and optical feedback distributed periodically along the laser stripe in the form of an optically coupled micro-cavity. The wavelength of emission of the laser is controlled by a combination of the length of the optical micro-cavities and the spacing between adjacent optical micro-cavities. Single-longitudinal-mode operation is exhibited over an extended drive current range. In one embodiment, two or more linear arrays of end-coupled micro-cavities are arranged in the longitudinal axis of the laser cavity to obtain a tunable laser.Type: GrantFiled: January 30, 2008Date of Patent: November 9, 2010Assignee: Vega Wave Systems, Inc.Inventors: Alan R. Sugg, David S. McCallum
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Publication number: 20100186822Abstract: The present application utilizes an oxidation process to fabricating a Group III-V compound semiconductor solar cell device. By the oxidation process, a window layer disposed on a cell unit is oxidized to enhance the efficiency of the solar cell device. The oxidized window has an increased band gap to minimize the surface recombination of electrons and holes. The oxidized window also improves transparency at the wavelengths that were absorbed in the conventional window layer.Type: ApplicationFiled: January 28, 2010Publication date: July 29, 2010Applicant: MICROLINK DEVICES, INC.Inventors: Noren PAN, Christopher YOUTSEY, David S. MCCALLUM, Victor C. ELARDE, John M. DALLESASSE
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Publication number: 20080181265Abstract: An array of optically coupled cavities (called micro-cavities) of a semiconductor laser are defined by either an etch and/or by a native oxide of an aluminum-bearing III-V semiconductor material and are arranged serially end-to-end along the longitudinal direction. An etch and/or native oxide defines a refractive index change for the longitudinal optical mode and confines the optical field within the micro-cavities, resulting in reflection and optical feedback distributed periodically along the laser stripe in the form of an optically coupled micro-cavity. The wavelength of emission of the laser is controlled by a combination of the length of the optical micro-cavities and the spacing between adjacent optical micro-cavities. Single-longitudinal-mode operation is exhibited over an extended drive current range. In one embodiment, two or more linear arrays of end-coupled micro-cavities are arranged in the longitudinal axis of the laser cavity to obtain a tunable laser.Type: ApplicationFiled: January 30, 2008Publication date: July 31, 2008Applicant: VEGA WAVE SYSTEMS, INC.Inventors: Alan R. Sugg, David S. McCallum