Patents by Inventor Almantas Galvanauskas

Almantas Galvanauskas 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).

  • Patent number: 10312657
    Abstract: A beam combining and pulse stacking technique is provided that enhances laser pulse energy by coherent stacking pulse bursts (i.e. non-periodic pulsed signals) in time domain. This energy enhancement is achieved by using various configurations of Fabry-Perot, Gires-Tournois and other types of resonant cavities, so that a multiple-pulse burst incident at either a single input or multiple inputs of the system produces an output with a solitary pulse, which contains the summed energy of the incident multiple pulses from all beams. This disclosure provides a substantial improvement over conventional coherent-combining methods in that it achieves very high pulse energies using a relatively small number of combined laser systems, thus providing with orders of magnitude reduction in system size, complexity, and cost compared to current combining approaches.
    Type: Grant
    Filed: October 4, 2017
    Date of Patent: June 4, 2019
    Assignee: THE REGENTS OF THE UNIVERSITY OF MICHIGAN
    Inventor: Almantas Galvanauskas
  • Publication number: 20180026418
    Abstract: A beam combining and pulse stacking technique is provided that enhances laser pulse energy by coherent stacking pulse bursts (i.e. non-periodic pulsed signals) in time domain. This energy enhancement is achieved by using various configurations of Fabry-Perot, Gires-Tournois and other types of resonant cavities, so that a multiple-pulse burst incident at either a single input or multiple inputs of the system produces an output with a solitary pulse, which contains the summed energy of the incident multiple pulses from all beams. This disclosure provides a substantial improvement over conventional coherent-combining methods in that it achieves very high pulse energies using a relatively small number of combined laser systems, thus providing with orders of magnitude reduction in system size, complexity, and cost compared to current combining approaches.
    Type: Application
    Filed: October 4, 2017
    Publication date: January 25, 2018
    Inventor: Almantas GALVANAUSKAS
  • Patent number: 9865986
    Abstract: A beam combining and pulse stacking technique is provided that enhances laser pulse energy by coherent stacking pulse bursts (i.e. non-periodic pulsed signals) in time domain. This energy enhancement is achieved by using various configurations of Fabry-Perot, Gires-Tournois and other types of resonant cavities, so that a multiple-pulse burst incident at either a single input or multiple inputs of the system produces an output with a solitary pulse, which contains the summed energy of the incident multiple pulses from all beams. This disclosure provides a substantial improvement over conventional coherent-combining methods in that it achieves very high pulse energies using a relatively small number of combined laser systems, thus providing with orders of magnitude reduction in system size, complexity, and cost compared to current combining approaches.
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: January 9, 2018
    Assignee: THE REGENTS OF THE UNIVERSITY OF MICHIGAN
    Inventor: Almantas Galvanauskas
  • Patent number: 9503196
    Abstract: A method for increasing energy in a pulse optical beam is provided. The method may include: receiving an optical input beam having a period pulse train with a given repetition frequency; splitting the input beam into N optical signals; phase modulating each signal in the N optical signals at a different phase, such that the N optical signal are orthogonal to each other; and coherently combining each of the phase modulated signals into a single optical output beam.
    Type: Grant
    Filed: June 11, 2013
    Date of Patent: November 22, 2016
    Assignee: The Regents Of The University Of Michigan
    Inventor: Almantas Galvanauskas
  • Publication number: 20160315441
    Abstract: A beam combining and pulse stacking technique is provided that enhances laser pulse energy by coherent stacking pulse bursts (i.e. non-periodic pulsed signals) in time domain. This energy enhancement is achieved by using various configurations of Fabry-Perot, Gires-Tournois and other types of resonant cavities, so that a multiple-pulse burst incident at either a single input or multiple inputs of the system produces an output with a solitary pulse, which contains the summed energy of the incident multiple pulses from all beams. This disclosure provides a substantial improvement over conventional coherent-combining methods in that it achieves very high pulse energies using a relatively small number of combined laser systems, thus providing with orders of magnitude reduction in system size, complexity, and cost compared to current combining approaches.
    Type: Application
    Filed: December 19, 2014
    Publication date: October 27, 2016
    Inventor: Almantas GALVANAUSKAS
  • Publication number: 20150086217
    Abstract: A method for increasing energy in a pulse optical beam is provided. The method may include: receiving an optical input beam having a period pulse train with a given repetition frequency; splitting the input beam into N optical signals; phase modulating each signal in the N optical signals at a different phase, such that the N optical signal are orthogonal to each other; and coherently combining each of the phase modulated signals into a single optical output beam.
    Type: Application
    Filed: June 11, 2013
    Publication date: March 26, 2015
    Inventor: Almantas Galvanauskas
  • Patent number: 8724207
    Abstract: Recent invention of longitudinally chirped volume Bragg gratings has dramatically changed a design of high power femtosecond lasers. Replacing of bulky pairs of conventional surface gratings with compact and robust chirped volume Bragg gratings for stretching and compression of laser pulses in chirped-pulse-amplification systems enabled decrease of size and weight of those systems by several times. The methods and devices enable substantial increase of stretching time and compression to shorter pulses, enhancement of stretched and compressed beams quality by stationary or dynamic shaping of gratings, and shaping of laser pulses in both temporal and spectral domains.
    Type: Grant
    Filed: January 13, 2011
    Date of Patent: May 13, 2014
    Assignees: University of Central Florida Research Foundation, Inc., Optigrate Corporation
    Inventors: Oleksiy Andrusyak, Almantas Galvanauskas, Leonid B. Glebov, Larissa Glebova, Julien Lumeau, Sergiy Mokhov, Eugeniu Rotari, Vadim I. Smirnov, Boris Ya Zeldovich
  • Patent number: 8107167
    Abstract: A beam combining system suitable of pulsed fiber laser applications is able to produce non-spatial-dispersive beams using an highly efficient filter, such as a multilayer dielectric filter, in transmission and reflection configurations. The techniques therefore can overcome constraints on laser line-width and beam width and allow for more stable systems for high peak power pulsed laser energy, such as may be used in extreme ultraviolet lithography and other applications.
    Type: Grant
    Filed: May 4, 2009
    Date of Patent: January 31, 2012
    Assignee: The Regents of The University of Michigan
    Inventors: Almantas Galvanauskas, Kai-Chung Hou
  • Patent number: 8098970
    Abstract: A composite waveguide includes a central core configured to transmit a plurality of modes and at least one side core helically wound about the central core and configured to be selectively coupled to at least a portion of the plurality of modes in the central core.
    Type: Grant
    Filed: October 4, 2010
    Date of Patent: January 17, 2012
    Assignee: The Regents of the University of Michigan
    Inventor: Almantas Galvanauskas
  • Patent number: 8072678
    Abstract: A modular, compact and widely tunable laser system for the efficient generation of high peak and high average power ultrashort pulses. System compactness is ensured by employing efficient fiber amplifiers, directly or indirectly pumped by diode lasers. Dispersive broadening is introduced by dispersive pulse stretching in the presence of self-phase modulation and gain, resulting in the formation of high-power parabolic pulses. In addition, dispersive broadening is also introduced by simple fiber delay lines or chirped fiber gratings. The phase of the pulses in the dispersive delay line is controlled to quartic order by the use of fibers with varying amounts of waveguide dispersion or by controlling the chirp of the fiber gratings. After amplification, the dispersively stretched pulses can be re-compressed to nearly their bandwidth limit by the implementation of another set of dispersive delay lines.
    Type: Grant
    Filed: October 29, 2009
    Date of Patent: December 6, 2011
    Assignee: Imra America, Inc.
    Inventors: Martin E. Fermann, Almantas Galvanauskas, Donald J. Harter
  • Publication number: 20110280262
    Abstract: A modular, compact and widely tunable laser system for the efficient generation of high peak and high average power ultrashort pulses. Modularity is ensured by the implementation of interchangeable amplifier components. System compactness is ensured by employing efficient fiber amplifiers, directly or indirectly pumped by diode lasers. Peak power handling capability of the fiber amplifiers is expanded by using optimized pulse shapes, as well as dispersively broadened pulses. Dispersive broadening is introduced by dispersive pulse stretching in the presence of self-phase modulation and gain, resulting in the formation of high-power parabolic pulses. In addition, dispersive broadening is also introduced by simple fiber delay lines or chirped fiber gratings, resulting in a further increase of the energy handling ability of the fiber amplifiers.
    Type: Application
    Filed: July 21, 2011
    Publication date: November 17, 2011
    Applicant: IMRA AMERICA, INC.
    Inventors: Martin E. Fermann, Almantas GALVANAUSKAS, Donald J. HARTER
  • Patent number: 8031396
    Abstract: A modular, compact and widely tunable laser system for the efficient generation of high peak and high average power ultrashort pulses. System compactness is ensured by employing efficient fiber amplifiers, directly or indirectly pumped by diode lasers. Dispersive broadening is introduced by dispersive pulse stretching in the presence of self-phase modulation and gain, resulting in the formation of high-power parabolic pulses. In addition, dispersive broadening is also introduced by simple fiber delay lines or chirped fiber gratings. The phase of the pulses in the dispersive delay line is controlled to quartic order by the use of fibers with varying amounts of waveguide dispersion or by controlling the chirp of the fiber gratings. After amplification, the dispersively stretched pulses can be re-compressed to nearly their bandwidth limit by the implementation of another set of dispersive delay lines.
    Type: Grant
    Filed: October 29, 2009
    Date of Patent: October 4, 2011
    Assignee: Imra America, Inc.
    Inventors: Martin E. Fermann, Almantas Galvanauskas, Donald J. Harter
  • Patent number: 7995270
    Abstract: The invention describes techniques for the control of the spatial as well as spectral beam quality of multi-mode fiber amplification of high peak power pulses as well as using such a configuration to replace the present diode-pumped, Neodynium based sources. Perfect spatial beam-quality can be ensured by exciting the fundamental mode in the multi-mode fibers with appropriate mode-matching optics and techniques. The loss of spatial beam-quality in the multi-mode fibers along the fiber length can be minimized by using multi-mode fibers with large cladding diameters. Near diffraction-limited coherent multi-mode amplifiers can be conveniently cladding pumped, allowing for the generation of high average power. Moreover, the polarization state in the multi-mode fiber amplifiers can be preserved by implementing multi-mode fibers with stress producing regions or elliptical fiber cores These lasers find application as a general replacement of Nd: based lasers, especially Nd:YAG lasers.
    Type: Grant
    Filed: December 24, 2009
    Date of Patent: August 9, 2011
    Assignee: IMRA America, Inc.
    Inventors: Donald J. Harter, Martin E. Fermann, Ferenc Raksi, Almantas Galvanauskas
  • Publication number: 20110024927
    Abstract: A composite waveguide includes a central core configured to transmit a plurality of modes and at least one side core helically wound about the central core and configured to be selectively coupled to at least a portion of the plurality of modes in the central core.
    Type: Application
    Filed: October 4, 2010
    Publication date: February 3, 2011
    Inventor: Almantas Galvanauskas
  • Publication number: 20100277804
    Abstract: A beam combining system suitable of pulsed fiber laser applications is able to produce non-spatial-dispersive beams using an highly efficient filter, such as a multilayer dielectric filter, in transmission and reflection configurations. The techniques therefore can overcome constraints on laser line-width and beam width and allow for more stable systems for high peak power pulsed laser energy, such as may be used in extreme ultraviolet lithography and other applications.
    Type: Application
    Filed: May 4, 2009
    Publication date: November 4, 2010
    Applicant: THE REGENTS OF THE UNIVERSITY OF MICHIGAN
    Inventors: Almantas Galvanauskas, Kai-Chung Hou
  • Patent number: 7809224
    Abstract: A composite waveguide includes a central core configured to transmit a plurality of modes and at least one side core helically wound about the central core and configured to be selectively coupled to at least a portion of the plurality of modes in the central core.
    Type: Grant
    Filed: September 5, 2008
    Date of Patent: October 5, 2010
    Assignee: The Regents of the University of Michigan
    Inventor: Almantas Galvanauskas
  • Publication number: 20100110537
    Abstract: The invention describes techniques for the control of the spatial as well as spectral beam quality of multi-mode fiber amplification of high peak power pulses as well as using such a configuration to replace the present diode-pumped, Neodynium based sources. Perfect spatial beam-quality can be ensured by exciting the fundamental mode in the multi-mode fibers with appropriate mode-matching optics and techniques. The loss of spatial beam-quality in the multi-mode fibers along the fiber length can be minimized by using multi-mode fibers with large cladding diameters. Near diffraction-limited coherent multi-mode amplifiers can be conveniently cladding pumped, allowing for the generation of high average power. Moreover, the polarization state in the multi-mode fiber amplifiers can be preserved by implementing multi-mode fibers with stress producing regions or elliptical fiber cores These lasers find application as a general replacement of Nd: based lasers, especially Nd:YAG lasers.
    Type: Application
    Filed: December 24, 2009
    Publication date: May 6, 2010
    Applicant: IMRA AMERICA, INC.
    Inventors: Almantas GALVANAUSKAS, Donald J. HARTER, Martin E. FERMANN, Ferenc RAKSI
  • Patent number: 7688499
    Abstract: A modular, compact and widely tunable laser system for the efficient generation of high peak and high average power ultrashort pulses. Modularity is ensured by the implementation of interchangeable amplifier components. System compactness is ensured by employing efficient fiber amplifiers, directly or indirectly pumped by diode lasers. Dispersive broadening is introduced by dispersive pulse stretching in the presence of self-phase modulation and gain, resulting in the formation of high-power parabolic pulses. In addition, dispersive broadening is also introduced by simple fiber delay lines or chirped fiber gratings, resulting in a further increase of the energy handling ability of the fiber amplifiers. After amplification, the dispersively stretched pulses can be re-compressed to nearly their bandwidth limit by the implementation of another set of dispersive delay lines.
    Type: Grant
    Filed: December 22, 2006
    Date of Patent: March 30, 2010
    Assignee: IMRA America, Inc.
    Inventors: Martin E. Fermann, Almantas Galvanauskas, Donald J. Harter
  • Publication number: 20100046066
    Abstract: A modular, compact and widely tunable laser system for the efficient generation of high peak and high average power ultrashort pulses. Modularity is ensured by the implementation of interchangeable amplifier components. System compactness is ensured by employing efficient fiber amplifiers, directly or indirectly pumped by diode lasers. Peak power handling capability of the fiber amplifiers is expanded by using optimized pulse shapes, as well as dispersively broadened pulses. Dispersive broadening is introduced by dispersive pulse stretching in the presence of self-phase modulation and gain, resulting in the formation of high-power parabolic pulses. In addition, dispersive broadening is also introduced by simple fiber delay lines or chirped fiber gratings, resulting in a further increase of the energy handling ability of the fiber amplifiers.
    Type: Application
    Filed: October 29, 2009
    Publication date: February 25, 2010
    Applicant: IMRA AMERICA, INC.
    Inventors: Martin E. FERMANN, Almantas GALVANAUSKAS, Donald J. HARTER
  • Patent number: RE45177
    Abstract: Use of quasi-phase-matched (QPM) materials for parametric chirped pulse amplification (PCPA) substantially reduces the required pump peak power and pump brightness, allowing exploitation of spatially-multimode and long duration pump pulses. It also removes restrictions on pump wavelength and amplification bandwidth. This allows substantial simplification in pump laser design for a high-energy PCPA system and, consequently, the construction of compact diode-pumped sources of high-energy ultrashort optical pulses. Also, this allows elimination of gain-narrowing and phase-distortion limitations on minimum pulse duration, which typically arise in a chirped pulse amplification system. One example of a compact source of high-energy ultrashort pulses is a multimode-core fiber based PCPA system. Limitations on pulse energy due to the limited core size for single-mode fibers are circumvented by using large multimode core.
    Type: Grant
    Filed: March 26, 2003
    Date of Patent: October 7, 2014
    Assignee: IMRA America, Inc.
    Inventors: Almantas Galvanauskas, Donald Harter, Gregg Sucha