Patents by Inventor John Haig Marsh
John Haig Marsh 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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Publication number: 20110222571Abstract: An imaging device comprising a linear array of laser diodes that are adapted to provide an optical output comprising a plurality of spaced-apart optical beams. Focusing optics are configured to form a plurality of image points from said spaced-apart optical beams, the image points being spaced apart along a first axis. The image points have a non-uniform spacing along the first axis. By scanning the linear array along a photosensitive plate, and timing the firing of lasers accordingly, every pixel point on the photosensitive plate can be imaged by one of the image points from the laser array. Non-uniform spacing of the image points can provide advantages in heat dissipation from the laser elements, and reduction of some printing artifacts on the photosensitive plate.Type: ApplicationFiled: September 11, 2009Publication date: September 15, 2011Applicant: INTENSE LIMITEDInventors: John Haig Marsh, Stewart Duncan McDougall, Gianluca Bacchin, Bocang Qiu
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Publication number: 20110102537Abstract: Methods and apparatus for implementing thermal printing techniques onto thermally sensitive print media use one or more laser arrays to provide optical heating. Thermal management of the laser arrays is described. Techniques for alignment of multiple monolithic arrays onto a common carrier are described. Various output optics are described.Type: ApplicationFiled: May 19, 2005Publication date: May 5, 2011Inventors: Neil Griffin, Samuel Charles William Hyde, Anthony Hailes, Keith Turner, Nicholas James Wooder, John Haig Marsh, Stephen Gorton, Christopher Humby, Gary Ternent, Eric Goutain, Xuefeng Liu, Alexander Ballantyne
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Publication number: 20090147352Abstract: A method of modulating an optical signal passing through a waveguide structure with a plurality of sections including electrically biasing one or more of the sections with a bias voltage to achieve a predetermined level of chirp, modulation depth, or insertion loss. Preferably, two or more sections are biased with a reverse bias voltage, a zero bias voltage, or forward bias voltage.Type: ApplicationFiled: January 7, 2009Publication date: June 11, 2009Applicant: INTENSE LIMITEDInventor: John Haig MARSH
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Publication number: 20080278565Abstract: Methods and apparatus for implementing thermal printing techniques onto thermally sensitive print media use one or more laser arrays to provide optical heating. Thermal management of the laser arrays is described. Techniques for alignment of multiple monolithic arrays onto a common carrier are described. Various output optics are described.Type: ApplicationFiled: May 19, 2005Publication date: November 13, 2008Inventors: John Haig Marsh, Stephen Gorton, Gary Ternent, Christopher Humby, Eric Goutain, Alexander Ballantyne
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Publication number: 20080231657Abstract: Methods and apparatus for implementing thermal printing techniques onto thermally sensitive print media use one or more laser arrays to provide optical heating. Technique for alignment of multiple monolithic arrays onto a common carrier are described, the axis of the at least one laser array being disposed obliquely to a transport direction of print media.Type: ApplicationFiled: May 19, 2005Publication date: September 25, 2008Inventors: John Haig Marsh, Stephen Gorton, Gary Ternent, Christopher Humby, Eric Goutain, Alexander Ballantyne
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Patent number: 7288794Abstract: An improved integrated optical device (5a-5g) is disclosed containing first and second devices (10a-10g; 15a, 15e), optically coupled to each other and formed in first and second different material systems. One of the first or second devices (10a-10g, 15a, 15e) has a Quantum Well Intermixed (QWI) region (20a, 20g) at or adjacent a coupling region between the first and second devices (10a-10g; 15a, 15e). The first material system may be a III-V semiconductor based on Gallium Arsenide (GaAs) or Indium Phosphide (InP), while the second material may be Silica (SiO2), Silicon (Si), Lithium Niobate (LiNbO3), a polymer, or glass.Type: GrantFiled: January 31, 2001Date of Patent: October 30, 2007Assignee: The University Court of the University of GlasgowInventors: John Haig Marsh, Simon Eric Hicks, James Stewart Aitchison, Stewart Duncan McDougall, Bo Cang Qiu
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Patent number: 6989286Abstract: There is disclosed a method of manufacturing of optical devices, for example, semiconductor optoelectronic devices such as laser diodes, optical modulators, optical amplifiers, optical switches, and the like. There is further disclosed Optoelectronic Integrated Circuits (OEICs) and Photonic Integrated Circuits (PICs) including such devices. According to the present invention there is provided a method of manufacturing an optical device (40), a device body portion (15) from which the device (40) is to be made including a Quantum Well Intermixing (QWI) structure (30), the method including the step of plasma etching at least part of a surface of the device body portion (5) prior to depositing a dielectric layer (51) thereon so as to introduce structural defects at least into a portion (53) of the device body portion (5) adjacent the dielectric layer (51). The structural defects substanially comprise “point” defects.Type: GrantFiled: January 23, 2002Date of Patent: January 24, 2006Assignee: The University Court of the University of GlasgowInventors: Craig James Hamilton, Olek Peter Kowalski, John Haig Marsh, Stewart Duncan McDougall
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Patent number: 6760355Abstract: There is disclosed an improved semiconductor laser device (10). Previous high power (greater than a few hundred milliwatts output) semiconductor lasers suffer from a number of problems such as poor beam quality and low brightness. The invention therefore provides a semiconductor laser device (10) including at least one portion which has been Quantum Well Intermixed (QWI) and means for providing gain profiling within an active portion of the device (10). In a preferred implementation the device (10) provides a Wide Optical Waveguide (WOW).Type: GrantFiled: July 27, 2001Date of Patent: July 6, 2004Assignee: The University Court of the University of GlasgowInventors: John Haig Marsh, Craig James Hamilton
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Publication number: 20040120377Abstract: There is disclosed an improved semiconductor laser device (10), and particularly, a broad area semiconductor laser with a singe-lobed far field pattern. Known broad area lasers are used for high power applications, but suffer from a number of problems such as filamentation, instabilities in the transverse mode, and poor far-field characteristics. The present invention addresses such by providing a semiconductor laser device (10) comprising: a plurality of optically active regions (240); each optically active region (240) including a Quantum Well (QW) structure (77); adjacent optically active regions (24) being spaced by an optically passive region; the/each optically passive region (245) being Quantum Well Intermixed (QW). The spacing between adjacent optically active regions (240) may conveniently be termed “segmentation”.Type: ApplicationFiled: February 9, 2004Publication date: June 24, 2004Inventors: John Haig Marsh, Shin-Sung Kim
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Publication number: 20040106224Abstract: There is disclosed a method of manufacturing of optical devices, for example, semiconductor optoelectronic devices such as laser diodes, optical modulators, optical amplifiers, optical switches, and the like. There is further disclosed Optoelectronic Integrated Circuits (OEICs) and Photonic Integrated Circuits (PICs) including such devices. According to the present invention there is provided a method of manufacturing an optical device (40), a device body portion (15) from which the device (40) is to be made including a Quantum Well Intermixing (QWI) structure (30), the method including the step of plasma etching at least part of a surface of the device body portion (5) prior to depositing a dielectric layer (51) thereon so as to introduce structural defects at least into a portion (53) of the device body portion (5) adjacent the dielectric layer (51). The structural defects substantially comprise “point” defects.Type: ApplicationFiled: December 12, 2003Publication date: June 3, 2004Inventors: Craig James Hamilton, Olek Peter Kowalski, John Haig Marsh, Stewart Duncan McDougall
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Patent number: 6719884Abstract: A method of manufacturing an optical device, wherein the device body portion from which the device is to be made includes at least one Quantum Well, the method including the step of causing an impurity material including copper to intermix with the Quantum Well.Type: GrantFiled: January 15, 2002Date of Patent: April 13, 2004Assignee: Intense Photonics LimitedInventors: John Haig Marsh, Craig James Hamilton, Olek Peter Kowalski, Stuart Duncan McDougall, Xuefeng Liu, Bo-Cang Qui
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Patent number: 6717971Abstract: There is disclosed an improved semiconductor laser device (10;10a), eg a single mode index guided laser diode. The device (10;10a) comprises: an optical waveguide (15;15a); at least one electrical contact (20;20a) extending along part of a length of the waveguide (15;15a); and wherein the at least one electrical contact (20;20a) is shorter than the optical waveguide (15;15a). By this arrangement a part or parts of the waveguide (15;15a) are not electrically pumped, in use.Type: GrantFiled: February 20, 2001Date of Patent: April 6, 2004Assignee: The University Court of The University of GlasgowInventors: John Haig Marsh, Craig James Hamilton
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Patent number: 6717970Abstract: There is disclosed an improved laser device (10), comprising a semiconductor laser diode. The invention provides laser device (10) comprising: at least two lasing regions (12,14); an interference region (16) into which an output of each lasing region (12,14) is coupled; and an output region (118) extending from the interference region (116) to an output (20) of the device (10).Type: GrantFiled: February 20, 2001Date of Patent: April 6, 2004Assignee: The University Court of the University of GlasgowInventors: John Haig Marsh, Craig James Hamilton
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Patent number: 6671300Abstract: There is disclosed an improved optical device (10;10a), eg comprising a semiconductor optically active or optoelectronic devices such as lasers, modulators, amplifiers, switching structures, or the like, mounted on a heatsink (28;28a) The invention provides an optically active device (10;10a) comprising a device body (12;12a) having an active region (14;14a) and an optically passive region(s) (20;22) provided at one or more ends (24,26;26a) of the active region (14;14a); and a heatsink (28;28a); the device body (12;12a) and heatsink (28;28a) being retained in thermal association with one another such that a first end of the at least one of the optically passive region(s) (20,22;22a) adjacent an end of the active region (14;14a) is provided within an area of the heatsink (28;28a), and a second end of the said at least one optically passive region(s) (20,22;22a) is provided outwith the area of the heatsink (28;28a).Type: GrantFiled: February 20, 2001Date of Patent: December 30, 2003Assignee: The University Court of the University of GlasgowInventors: John Haig Marsh, Craig James Hamilton
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Patent number: 6632684Abstract: There is disclosed an improved method of manufacturing of an optical device (40), particularly semiconductor optoelectronic devices such as laser diodes, optical modulators, optical amplifiers, optical switches, and optical detectors. The invention provides a method of manufacturing optical device (40), a device body portion (15) from which the device (40) is to be made including a Quantum Well (QW) structure (30), the method including the step of: processing the device body portion (15) so as to create extended defects at least in a portion (53) of the device portion (5). Each extended defect is a structural defect comprising a plurality of adjacent “point” defects.Type: GrantFiled: February 20, 2001Date of Patent: October 14, 2003Assignee: The University Court of The University of GlasgowInventors: John Haig Marsh, Craig James Hamilton, Stuart Duncan McDougall, Olek Peter Kowalski
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Publication number: 20030141511Abstract: An improved integrated optical device (5a-5g) is disclosed containing first and second devices (10a-10g; 15a, 15e), optically coupled to each other and formed in first and second different material systems. One of the first or second devices (10a-10g, 15a, 15e) has a Quantum Well Intermixed (QWI) region (20a, 20g) at or adjacent a coupling region between the first and second devices (10a-10g; 15a, 15e). The first material system may be a Ill-V semiconductor based on Gallium Arsenide (GaAs) or Indium Phosphide (InP), while the second material may be Silica (SiO2), Silicon (Si), Lithium Niobate (LiNbO3), a polymer, or glass.Type: ApplicationFiled: December 9, 2002Publication date: July 31, 2003Inventors: John Haig Marsh, Simon Eric Hicks, James Stewart Aitchison, Stewart Duncan McDougall, Bo Cang Qiu
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Publication number: 20030053789Abstract: There is disclosed an improved method of manufacturing an optical device using impurity induced Quantum Well Intermixing (QWI) process.Type: ApplicationFiled: January 15, 2002Publication date: March 20, 2003Applicant: The University Court of the University of GlasgowInventors: John Haig Marsh, Craig James Hamilton, Olek Peter Kowalski, Stuart Duncan McDougall, Xuefeng Liu, Bo-Cang Qui
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Publication number: 20030021313Abstract: There is disclosed an improved semiconductor laser device (10). Previous high power (greater than a few hundred milliwatts output) semiconductor lasers suffer from a number of problems such as poor beam quality and low brightness. The invention therefore provides a semiconductor laser device (10) including at least one portion which has been Quantum Well Intermixed (QWI) and means for providing gain profiling within an active portion of the device (10). In a preferred implementation the device (10) provides a Wide Optical Waveguide (WOW).Type: ApplicationFiled: July 27, 2001Publication date: January 30, 2003Inventors: John Haig Marsh, Craig James Hamilton
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Publication number: 20020137251Abstract: There is disclosed an improved method of manufacturing of an optical device (40), particularly semiconductor optoelectronic devices such as laser diodes, optical modulators, optical amplifiers, optical switches, and optical detectors. The invention provides a method of manufacturing optical device (40), a device body portion (15) from which the device (40) is to be made including a Quantum Well (QW) structure (30), the method including the step of: processing the device body portion (15) so as to create extended defects at least in a portion (53) of the device portion (5). Each extended defect is a structural defect comprising a plurality of adjacent “point” defects.Type: ApplicationFiled: February 20, 2001Publication date: September 26, 2002Inventors: John Haig Marsh, Craig James Hamilton, Stewart Duncan McDougall, Olek Peter Kowalski
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Publication number: 20020131668Abstract: There is disclosed a method of manufacturing of optical devices, for example, semiconductor optoelectronic devices such as laser diodes, optical modulators, optical amplifiers, optical switches, and the like. There is further disclosed Optoelectronic Integrated Circuits (OEICs) and Photonic Integrated Circuits (PICs) including such devices. According to the present invention there is provided a method of manufacturing an optical device (40), a device body portion (15) from which the device (40) is to be made including a Quantum Well Intermixing (QWI) structure (30), the method including the step of depositing a dielectric layer (51) on at least part of a surface of the device body portion (5) so as to introduce structural defects at least into a portion (53) of the device body portion (5) adjacent the dielectric layer (51). The structural defects substantially comprise “point” defects.Type: ApplicationFiled: February 20, 2001Publication date: September 19, 2002Inventors: John Haig Marsh, Craig James Hamilton, Stewart Duncan McDougall, Olek Peter Kowalski