Patents by Inventor Andrew James Bayramian
Andrew James Bayramian 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: 12162074Abstract: The present disclosure relates to systems and methods for performing large area laser powder bed fusion (LBPF) to form a plurality of layers of a 3D part in a layer-by-layer fashion using meltable powder particles. In one implementation the system makes use of a first light source, which may be a diode laser subsystem, for generating a first light pulse of a first duration. The first light is used to preheat a substrate underneath a new layer of powder particles, wherein the substrate is formed from a previously fused quantity of the powder particles. A second light source, which may be a pulse laser, generates a second light pulse subsequent to the first light pulse. The second light pulse has a second duration shorter than the first duration by a factor of at least about 10, and fully melts the new layer of powder particles in addition to the substrate, to achieve a smooth printed layer. The wavelength of the first light pulse also differs from a wavelength of the second light pulse.Type: GrantFiled: October 4, 2021Date of Patent: December 10, 2024Assignees: Lawrence Livermore National Security, LLC, Seurat Technologies, Inc.Inventors: Saad A. Khairallah, John Roehling, Yiyu Shen, Andrew James Bayramian, Ning Duanmu, James A. Demuth
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Publication number: 20220161332Abstract: The present disclosure relates to systems and methods for performing large area laser powder bed fusion (LBPF) to form a plurality of layers of a 3D part in a layer-by-layer fashion using meltable powder particles. In one implementation the system makes use of a first light source, which may be a diode laser subsystem, for generating a first light pulse of a first duration. The first light is used to preheat a substrate underneath a new layer of powder particles, wherein the substrate is formed from a previously fused quantity of the powder particles. A second light source, which may be a pulse laser, generates a second light pulse subsequent to the first light pulse. The second light pulse has a second duration shorter than the first duration by a factor of at least about 10, and fully melts the new layer of powder particles in addition to the substrate, to achieve a smooth printed layer. The wavelength of the first light pulse also differs from a wavelength of the second light pulse.Type: ApplicationFiled: October 4, 2021Publication date: May 26, 2022Inventors: Saad A. KHAIRALLAH, John ROEHLING, Yiyu SHEN, Andrew James BAYRAMIAN, Ning DUANMU, James A. DEMUTH
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Patent number: 10777964Abstract: A laser amplifier module having an enclosure includes an input window, a mirror optically coupled to the input window and disposed in a first plane, and a first amplifier head disposed along an optical amplification path adjacent a first end of the enclosure. The laser amplifier module also includes a second amplifier head disposed along the optical amplification path adjacent a second end of the enclosure and a cavity mirror disposed along the optical amplification path.Type: GrantFiled: October 24, 2019Date of Patent: September 15, 2020Assignee: LAWRENCE LIVERMORE NATIONAL SECURITY, LLCInventors: Andrew James Bayramian, Kenneth Manes, Robert J. Deri, Al Erlandson, John Caird, Mary Spaeth
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Publication number: 20200059064Abstract: A laser amplifier module having an enclosure includes an input window, a mirror optically coupled to the input window and disposed in a first plane, and a first amplifier head disposed along an optical amplification path adjacent a first end of the enclosure. The laser amplifier module also includes a second amplifier head disposed along the optical amplification path adjacent a second end of the enclosure and a cavity mirror disposed along the optical amplification path.Type: ApplicationFiled: October 24, 2019Publication date: February 20, 2020Applicant: LAWRENCE LIVERMORE NATIONAL SECURITY, LLCInventors: Andrew James Bayramian, Kenneth Manes, Robert J. Deri, Al Erlandson, John Caird, Mary Spaeth
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Patent number: 10476226Abstract: A laser amplifier module having an enclosure includes an input window, a mirror optically coupled to the input window and disposed in a first plane, and a first amplifier head disposed along an optical amplification path adjacent a first end of the enclosure. The laser amplifier module also includes a second amplifier head disposed along the optical amplification path adjacent a second end of the enclosure and a cavity mirror disposed along the optical amplification path.Type: GrantFiled: August 6, 2015Date of Patent: November 12, 2019Assignee: Lawrence Livermore National Security, LLCInventors: Andrew James Bayramian, Kenneth Manes, Robert J. Deri, Al Erlandson, John Caird, Mary Spaeth
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Patent number: 10454244Abstract: Apparatuses, methods, and systems are disclosed to drive pumping laser diode arrays. In implementations, an integrated system can be constructed to in a compact, efficient and cost-effective manner and to meet the needs of driving laser diode arrays in various diode pumped solid state laser applications. The disclosed implementations include individual laser diode drivers or pulsers, methods of communicating with laser diode drivers, and methods of controlling the pulse shape of each laser diode driver.Type: GrantFiled: August 9, 2017Date of Patent: October 22, 2019Assignee: Lawrence Livermore National Security, LLCInventors: Steven J. Telford, Andrew James Bayramian, Glenn Beer, Robert J. Deri, Edward S. Fulkerson, Charles L. Heinbockel, Edward S. Koh, Rodney Kay Lanning
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Publication number: 20190305509Abstract: A laser amplifier module having an enclosure includes an input window, a mirror optically coupled to the input window and disposed in a first plane, and a first amplifier head disposed along an optical amplification path adjacent a first end of the enclosure. The laser amplifier module also includes a second amplifier head disposed along the optical amplification path adjacent a second end of the enclosure and a cavity mirror disposed along the optical amplification path.Type: ApplicationFiled: August 6, 2015Publication date: October 3, 2019Inventors: Andrew James Bayramian, Kenneth Manes, Robert J. Deri, Al Erlandson, John Caird, Mary Spaeth
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Publication number: 20190052051Abstract: Apparatuses, methods, and systems are disclosed to drive pumping laser diode arrays. In implementations, an integrated system can be constructed to in a compact, efficient and cost-effective manner and to meet the needs of driving laser diode arrays in various diode pumped solid state laser applications. The disclosed implementations include individual laser diode drivers or pulsers, methods of communicating with laser diode drivers, and methods of controlling the pulse shape of each laser diode driver.Type: ApplicationFiled: August 9, 2017Publication date: February 14, 2019Inventors: Steven J. Telford, Andrew James Bayramian, Glenn Beer, Robert J. Deri, Edward S. Fulkerson, Charles L. Heinbockel, Edward S. Koh, Rodney Kay Lanning
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Patent number: 9331452Abstract: An optical amplifier system includes a diode pump array including a plurality of semiconductor diode laser bars disposed in an array configuration and characterized by a periodic distance between adjacent semiconductor diode laser bars. The periodic distance is measured in a first direction perpendicular to each of the plurality of semiconductor diode laser bars. The diode pump array provides a pump output propagating along an optical path and characterized by a first intensity profile measured as a function of the first direction and having a variation greater than 10%. The optical amplifier system also includes a diffractive optic disposed along the optical path. The diffractive optic includes a photo-thermo-refractive glass member. The optical amplifier system further includes an amplifier slab having an input face and position along the optical path and separated from the diffractive optic by a predetermined distance.Type: GrantFiled: June 6, 2013Date of Patent: May 3, 2016Assignee: Lawrence Livermore National Security, LLCInventor: Andrew James Bayramian
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Patent number: 9136668Abstract: A laser amplifier module having an enclosure includes an input window, a mirror optically coupled to the input window and disposed in a first plane, and a first amplifier head disposed along an optical amplification path adjacent a first end of the enclosure. The laser amplifier module also includes a second amplifier head disposed along the optical amplification path adjacent a second end of the enclosure and a cavity mirror disposed along the optical amplification path.Type: GrantFiled: October 28, 2011Date of Patent: September 15, 2015Assignee: Lawrence Livermore National Security, LLCInventors: Andrew James Bayramian, Alvin Charles Erlandson, Kenneth Rene Manes, Mary Louis Spaeth, John Allyn Caird, Robert J. Deri
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Patent number: 9036677Abstract: An optical gain architecture includes a pump source and a pump aperture. The architecture also includes a gain region including a gain element operable to amplify light at a laser wavelength. The gain region is characterized by a first side intersecting an optical path, a second side opposing the first side, a third side adjacent the first and second sides, and a fourth side opposing the third side. The architecture further includes a dichroic section disposed between the pump aperture and the first side of the gain region. The dichroic section is characterized by low reflectance at a pump wavelength and high reflectance at the laser wavelength. The architecture additionally includes a first cladding section proximate to the third side of the gain region and a second cladding section proximate to the fourth side of the gain region.Type: GrantFiled: June 5, 2013Date of Patent: May 19, 2015Assignee: Lawrence Livermore National Security, LLCInventors: Andrew James Bayramian, Kenneth R. Manes, Robert Deri, Alvin Erlandson, John Caird, Mary L. Spaeth
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Publication number: 20140362432Abstract: An optical amplifier system includes a diode pump array including a plurality of semiconductor diode laser bars disposed in an array configuration and characterized by a periodic distance between adjacent semiconductor diode laser bars. The periodic distance is measured in a first direction perpendicular to each of the plurality of semiconductor diode laser bars. The diode pump array provides a pump output propagating along an optical path and characterized by a first intensity profile measured as a function of the first direction and having a variation greater than 10%. The optical amplifier system also includes a diffractive optic disposed along the optical path. The diffractive optic includes a photo-thermo-refractive glass member. The optical amplifier system further includes an amplifier slab having an input face and position along the optical path and separated from the diffractive optic by a predetermined distance.Type: ApplicationFiled: June 6, 2013Publication date: December 11, 2014Inventor: Andrew James Bayramian
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Patent number: 8902497Abstract: A spatial filter includes a first filter element and a second filter element overlapping with the first filter element. The first filter element includes a first pair of cylindrical lenses separated by a first distance. Each of the first pair of cylindrical lenses has a first focal length. The first filter element also includes a first longitudinal slit filter positioned between the first pair of cylindrical lenses. The second filter element includes a second pair of cylindrical lenses separated by a second distance. Each of the second pair of cylindrical lenses has a second focal length. The second filter element also includes a second longitudinal slit filter positioned between the second pair of cylindrical lenses.Type: GrantFiled: September 7, 2011Date of Patent: December 2, 2014Assignee: Lawrence Livermore National Security, LLCInventors: Alvin Charles Erlandson, Andrew James Bayramian
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Patent number: 8780440Abstract: A chirped pulse amplification system includes a laser source providing an input laser pulse along an optical path. The input laser pulse is characterized by a first temporal duration. The system also includes a multi-pass pulse stretcher disposed along the optical path. The multi-pass pulse stretcher includes a first set of mirrors operable to receive input light in a first plane and output light in a second plane parallel to the first plane and a first diffraction grating. The pulse stretcher also includes a second set of mirrors operable to receive light diffracted from the first diffraction grating and a second diffraction grating. The pulse stretcher further includes a reflective element operable to reflect light diffracted from the second diffraction grating. The system further includes an amplifier, a pulse compressor, and a passive dispersion compensator disposed along the optical path.Type: GrantFiled: May 18, 2010Date of Patent: July 15, 2014Assignee: Lawrence Livermore National Security, LLCInventors: Andrew James Bayramian, William A. Molander
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Patent number: 8682125Abstract: A gain medium operable to amplify light at a gain wavelength and having reduced transverse ASE includes an input surface and an output surface opposing the input surface. The gain medium also includes a central region including gain material and extending between the input surface and the output surface along a longitudinal optical axis of the gain medium. The gain medium further includes an edge cladding region surrounding the central region and extending between the input surface and the output surface along the longitudinal optical axis of the gain medium. The edge cladding region includes the gain material and a dopant operable to absorb light at the gain wavelength.Type: GrantFiled: May 20, 2010Date of Patent: March 25, 2014Assignee: Lawrence Livermore National Security, LLCInventors: Andrew James Bayramian, John Allyn Caird, Kathleen Irene Schaffers
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Publication number: 20130272336Abstract: An optical gain architecture includes a pump source and a pump aperture. The architecture also includes a gain region including a gain element operable to amplify light at a laser wavelength. The gain region is characterized by a first side intersecting an optical path, a second side opposing the first side, a third side adjacent the first and second sides, and a fourth side opposing the third side. The architecture further includes a dichroic section disposed between the pump aperture and the first side of the gain region. The dichroic section is characterized by low reflectance at a pump wavelength and high reflectance at the laser wavelength. The architecture additionally includes a first cladding section proximate to the third side of the gain region and a second cladding section proximate to the fourth side of the gain region.Type: ApplicationFiled: June 5, 2013Publication date: October 17, 2013Inventors: Andrew James Bayramian, Kenneth R. Manes, Robert Deri, Alvin Erlandson, John Caird, Mary L. Spaeth
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Patent number: 8483255Abstract: An optical gain architecture includes a pump source and a pump aperture. The architecture also includes a gain region including a gain element operable to amplify light at a laser wavelength. The gain region is characterized by a first side intersecting an optical path, a second side opposing the first side, a third side adjacent the first and second sides, and a fourth side opposing the third side. The architecture further includes a dichroic section disposed between the pump aperture and the first side of the gain region. The dichroic section is characterized by low reflectance at a pump wavelength and high reflectance at the laser wavelength. The architecture additionally includes a first cladding section proximate to the third side of the gain region and a second cladding section proximate to the fourth side of the gain region.Type: GrantFiled: November 5, 2010Date of Patent: July 9, 2013Assignee: Lawrence Livermore National Security, LLCInventors: Andrew James Bayramian, Kenneth Manes, Robert Deri, Al Erlandson, John Caird, Mary Spaeth
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Publication number: 20120275479Abstract: A high average power laser system with modulated gain suppression includes an input aperture associated with a first laser beam extraction path and an output aperture associated with the first laser beam extraction path. The system also includes a pinhole creation laser having an optical output directed along a pinhole creation path and an absorbing material positioned along both the first laser beam extraction path and the pinhole creation path. The system further includes a mechanism operable to translate the absorbing material in a direction crossing the first laser beam extraction laser path and a controller operable to modulate the second laser beam.Type: ApplicationFiled: July 6, 2012Publication date: November 1, 2012Applicant: Lawrence Livermore National Security, LLCInventor: Andrew James Bayramian
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Patent number: 8284809Abstract: A pulse of laser light is switched out of a pulse train and spatially dispersed into its constituent wavelengths. The pulse is collimated to a suitable size and then diffracted by high groove density multilayer dielectric gratings. This imparts a different angle to each individual wavelength so that, when brought to the far field with a lens, the colors have spread out in a linear arrangement. The distance between wavelengths (resolution) can be tailored for the specific laser and application by altering the number of times the beam strikes the diffraction gratings, the groove density of the gratings and the focal length of the lens. End portions of the linear arrangement are each directed to a respective detector, which converts the signal to a 1 if the level meets a set-point, and a 0 if the level does not. If both detectors produces a 1, then the pulse train is allowed to propagate into an optical system.Type: GrantFiled: March 22, 2010Date of Patent: October 9, 2012Assignee: Lawrence Livermore National Security, LLCInventors: James P. Armstrong, Steven James Telford, Rodney Kay Lanning, Andrew James Bayramian
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Patent number: 8271120Abstract: A method of finishing an optical element includes mounting the optical element in an optical mount having a plurality of fiducials overlapping with the optical element and obtaining a first metrology map for the optical element and the plurality of fiducials. The method also includes obtaining a second metrology map for the optical element without the plurality of fiducials, forming a difference map between the first metrology map and the second metrology map, and aligning the first metrology map and the second metrology map. The method further includes placing mathematical fiducials onto the second metrology map using the difference map to form a third metrology map and associating the third metrology map to the optical element. Moreover, the method includes mounting the optical element in the fixture in an MRF tool, positioning the optical element in the fixture; removing the plurality of fiducials, and finishing the optical element.Type: GrantFiled: April 14, 2010Date of Patent: September 18, 2012Assignee: Lawrence Livermore National Security, LLCInventors: Joseph Arthur Menapace, Kathleen Irene Schaffers, Andrew James Bayramian, William A. Molander