Patents by Inventor Robert G. Waarts

Robert G. Waarts 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: 9535217
    Abstract: Multimode beam combiners include at least one gradient-step index optical fiber in which a refractive index difference at a core/cladding interface is selected to provide a numerical aperture so as to provide stable, uniform beam output. One or more such fibers is formed into a tapered bundle than can be shaped to provide a selected illuminated aperture. The fibers in the bundle can be separated by respective tapered claddings so as to be optically coupled or uncoupled. Illumination systems can include a plurality of such fibers coupled to a plurality of laser diodes or other light sources.
    Type: Grant
    Filed: May 1, 2015
    Date of Patent: January 3, 2017
    Assignee: nLIGHT, Inc.
    Inventors: Jason N. Farmer, Ronii C. Mehl, Robert G. Waarts
  • Patent number: 9494738
    Abstract: Single mode fiber beam combiners are formed by extending single mode fibers through a glass ferrule, and tapering and fusing the fibers and the ferrule. Tapers can be selected so that optical power input to each of the single mode fibers remains partially guided by the single mode fiber cladding, or is guided by the multimode fiber formed by the glass ferrule and the fused fiber claddings. Such combiners can include double clad fibers or actively doped fibers for use in lasers or amplifiers.
    Type: Grant
    Filed: May 28, 2009
    Date of Patent: November 15, 2016
    Assignee: nLIGHT, Inc.
    Inventors: Jason N. Farmer, Robert G. Waarts, John Edgecumbe
  • Patent number: 9063289
    Abstract: Multimode beam combiners include at least one gradient-step index optical fiber in which a refractive index difference at a core/cladding interface is selected to provide a numerical aperture so as to provide stable, uniform beam output. One or more such fibers is formed into a tapered bundle than can be shaped to provide a selected illuminated aperture. The fibers in the bundle can be separated by respective tapered claddings so as to be optically coupled or uncoupled. Illumination systems can include a plurality of such fibers coupled to a plurality of laser diodes or other light sources.
    Type: Grant
    Filed: June 30, 2009
    Date of Patent: June 23, 2015
    Assignee: nLight Photonics Corporation
    Inventors: Jason N. Farmer, Ronii C. Mehl, Robert G. Waarts
  • Patent number: 9044829
    Abstract: Scribing operations with reduced substrate heating can be provided by applying multiple optical pulses to a substrate within a time interval that is less than a material recombination time. Typically a series of pulses of durations of 5-200 ps with pulse energies of less than about 0.002 mJ can be applied at rates of about 1 MHz to about 30 MHz. Beam area and beam scanning are configured to provide substantial overlap so that material can be removed by cold ablation.
    Type: Grant
    Filed: November 9, 2010
    Date of Patent: June 2, 2015
    Assignee: nLight Photonics Corporation
    Inventors: Jordan Crist, Jason N. Farmer, Robert G. Waarts
  • Patent number: 8139910
    Abstract: A method of controlling an ultra-short pulse system is described comprising controlling an optical power within the ultra-short pulse system and control-system controlling a width of an optical pulse. In some embodiments, the method also comprises tuning a compressor by controlling a number of passes of the optical pulse through a Bragg grating to control the width of the optical pulse output from the compressor. In other embodiments, the method may comprise tuning a multi-pass stretcher by controlling a number of passes of the optical pulse through a loop of the multi-pass stretcher to control the width of the optical pulse output from the multi-pass stretcher. A method of controlling an ultra-short pulse system may also comprise accessing a control system from a remotely located command station, communicating status information from the control system to the command station, and communicating information from the command station to the control system.
    Type: Grant
    Filed: October 27, 2008
    Date of Patent: March 20, 2012
    Assignee: Raydiance, Inc.
    Inventors: Andrew D. Stadler, David Goldman, Mark Farley, Michael M. Mielke, Kyungbum Kim, Laurent Vaissié, Robert G. Waarts, Michael J. Cumbo
  • Patent number: 8125704
    Abstract: An ultra-short pulsed laser system comprises an optical combiner, optical amplifier, optical pulse compressor, and optical separator. The optical combiner is configured to combine a primary optical pulse with a secondary optical signal to generate a combined optical signal. The primary optical pulse and the secondary optical signal have a distinguishable characteristic. The optical amplifier is configured to optically amplify the combined optical signal. The optical pulse compressor is configured to compress at least the primary optical pulse contained within the optically amplified combined optical signal and output a compressed combined optical signal. The optical separator is configured to separate the compressed combined optical signal into an output primary optical pulse and an output secondary optical signal according to the distinguishable characteristic.
    Type: Grant
    Filed: August 18, 2008
    Date of Patent: February 28, 2012
    Assignee: Raydiance, Inc.
    Inventors: Michael M. Mielke, Robert G. Waarts, Sha Tong, Kok Wai Chang
  • Publication number: 20110259861
    Abstract: Scribing operations with reduced substrate heating can be provided by applying multiple optical pulses to a substrate within a time interval that is less than a material recombination time. Typically a series of pulses of durations of 5-200 ps with pulse energies of less than about 0.002 mJ can be applied at rates of about 1 MHz to about 30 MHz. Beam area and beam scanning are configured to provide substantial overlap so that material can be removed by cold ablation.
    Type: Application
    Filed: November 9, 2010
    Publication date: October 27, 2011
    Inventors: Jordan Crist, Jason N. Farmer, Robert G. Waarts
  • Publication number: 20100118900
    Abstract: Exemplary systems and methods are directed toward the creation of packets of light. A packet contains one or more pulses of light. In some embodiments, the packet may contain two, ten, 100, 1000, 1E6, or more pulses of light. The packet may be characterized by many of the same properties that are used to describe pulses, such as packet energy, packet width, packet power, packet period (for a periodic series of packets), and peak power of the packet. Packets may also be characterized by other properties describing their shapes. These properties may be described or defined by mathematical functions when the packets have complicated shapes.
    Type: Application
    Filed: November 13, 2008
    Publication date: May 13, 2010
    Inventors: Robert G. Waarts, Gregory J.R. Spooner
  • Publication number: 20100040095
    Abstract: An ultra-short pulsed laser system comprises an optical combiner, optical amplifier, optical pulse compressor, and optical separator. The optical combiner is configured to combine a primary optical pulse with a secondary optical signal to generate a combined optical signal. The primary optical pulse and the secondary optical signal have a distinguishable characteristic. The optical amplifier is configured to optically amplify the combined optical signal. The optical pulse compressor is configured to compress at least the primary optical pulse contained within the optically amplified combined optical signal and output a compressed combined optical signal. The optical separator is configured to separate the compressed combined optical signal into an output primary optical pulse and an output secondary optical signal according to the distinguishable characteristic.
    Type: Application
    Filed: August 18, 2008
    Publication date: February 18, 2010
    Inventors: Michael M. Mielke, Robert G. Waarts, Sha Tong, Kok Wai Chang
  • Publication number: 20090323740
    Abstract: A method of controlling an ultra-short pulse system is described comprising controlling an optical power within the ultra-short pulse system and control-system controlling a width of an optical pulse. In some embodiments, the method also comprises tuning a compressor by controlling a number of passes of the optical pulse through a Bragg grating to control the width of the optical pulse output from the compressor. In other embodiments, the method may comprise tuning a multi-pass stretcher by controlling a number of passes of the optical pulse through a loop of the multi-pass stretcher to control the width of the optical pulse output from the multi-pass stretcher. A method of controlling an ultra-short pulse system may also comprise accessing a control system from a remotely located command station, communicating status information from the control system to the command station, and communicating information from the command station to the control system.
    Type: Application
    Filed: October 27, 2008
    Publication date: December 31, 2009
    Inventors: Andrew D. Stadler, David Goldman, Mark Farley, Michael M. Mielke, Kyungbum Kim, Laurent Vaissié, Robert G. Waarts, Michael J. Cumbo
  • Publication number: 20090273828
    Abstract: The present invention includes an apparatus and the method to scale the average power from high power ultra-short pulsed lasers, while at the same time addressing the issue of effective beam delivery and ablation, by use of an optical amplification system.
    Type: Application
    Filed: April 30, 2008
    Publication date: November 5, 2009
    Inventors: Robert G. Waarts, Timothy J. Booth
  • Patent number: 7444049
    Abstract: A chirped pulse amplification (CPA) system and method is described wherein the pulse is stretched using multiple passes through a Bragg grating or compressed using multiple passes through a Bragg grating. A switch may be used to control the number of passes through the Bragg grating, thus, tuning the compressed or the stretched pulse width. The pulse may be directed through an amplifier between the multiple passes through the Bragg grating to apply amplification to the stretched pulse multiple times. The Bragg grating may include a fiber Bragg grating, a volume Bragg grating, or a Bragg waveguide.
    Type: Grant
    Filed: December 22, 2006
    Date of Patent: October 28, 2008
    Assignee: Raydiance, Inc.
    Inventors: Kyungbum Kim, Laurent Vaissié, Robert G. Waarts, Andrew Stadler, Michael J. Cumbo
  • Patent number: 7260133
    Abstract: A diode-pumped laser with a direct edge coupling of a pump beam is provided. The laser includes a microchip laser cavity optically pumped by a laser diode emitting an astigmatic pump beam having a substantially elliptical beam cross-section at an output laser diode facet. The microchip laser cavity is disposed at a substantial distance exceeding 0.001? from the laser diode pump where the astigmatic pump beam has a greatly reduced ellipticity, providing high laser output efficiency without coupling lens element between the laser cavity and the laser diode pump. The pumping arrangement is favourable for single-mode lasing. In some embodiments, the laser cavity includes nonlinear crystal for intra-cavity SHG, a saturable absorber for passive Q-switching and mode locking, and a polarizing prism.
    Type: Grant
    Filed: December 15, 2004
    Date of Patent: August 21, 2007
    Assignee: JDS Uniphase Corporation
    Inventors: Gang Lei, Charles Andy Hulse, Vincent Issier, Richard A. Bradley, Jr., Robert G. Waarts
  • Patent number: 7203428
    Abstract: The invention relates to the monitoring of polarization mode dispersion (PMD) using heterodyne detection for providing PMD compensation in optical networks, and an apparatus for monitoring PMD. In the present invention, a broadband PMD monitor is disclosed based on heterodyne detection with a tunable laser source which can be fed to a compensator such as an add/drop or other wavelength switch and polarization dependent attenuation means. A signal from a local oscillator is combined with an optical signal and the beat frequency amplitude and phase is analyzed for two orthogonal polarization states simultaneously to obtain a state of polarization. By averaging a plurality of polarization states within a channel, PMD can be estimated for compensation.
    Type: Grant
    Filed: June 10, 2003
    Date of Patent: April 10, 2007
    Assignee: JDS Uniphase Corporation
    Inventors: Robert G. Waarts, Russell Chipman
  • Patent number: 7177340
    Abstract: A laser apparatus is disclosed utilizing a laser diode having a reflective back facet and a front facet having a reflectance of less than about 1% for emitting an optical beam at a fundamental frequency along an optical path. A collimating lens is provided for collimating the optical beam into a collimated beam. A transmission grating is optically coupled to receive the collimated beam and returns a portion of the collimated beam back into the laser diode by means of diffraction through lens and the laser diode front facet. The laser diode reflective back facet and the transmission grating form an extended laser cavity. In operation, a substantial portion of the collimated beam is transmitted through the transmission grating for producing the laser output beam propagating along the optical path.
    Type: Grant
    Filed: November 4, 2003
    Date of Patent: February 13, 2007
    Assignee: JDS Uniphase Corporation
    Inventors: Robert J. Lang, Robert G. Waarts
  • Patent number: 7120174
    Abstract: A laser apparatus for generating optical pulses is disclosed, said laser apparatus has a reflecting gain element preferably including a fiber gain medium. The reflecting gain element is coupled to a controllable reflecting/transmitting module having a reflecting state and a transmitting state, wherein the controllable reflecting/transmitting means are operable to switch from the transmitting state to the reflecting state to initiate a build-up of an optical pulse, and to switch back to the transmitting state for outputting the optical pulse before it reaches the reflecting/transmitting means after a cavity roundtrip. In a preferred embodiment, the controllable reflecting/transmitting module includes an acousto-optic switch at an output end of a laser operable to output the optical pulse in zeroth diffraction order.
    Type: Grant
    Filed: June 14, 2004
    Date of Patent: October 10, 2006
    Assignee: JDS Uniphase Corporation
    Inventors: Stuart MacCormack, Robert G. Waarts
  • Patent number: 6996140
    Abstract: A laser apparatus for nonlinear conversion of light is disclosed utilizing a laser diode having a reflective back facet and a front facet having a reflectance of less than about 1% for emitting a multifrequency optical beam, and a nonlinear optical element for receiving the multifrequency optical beam and for generating a frequency-converted radiation. An external frequency-selective reflector is provided for power and spectral stabilization of the multifrequency optical beam, and for confining its optical spectrum within a bandwidth of efficient nonlinear conversion in the nonlinear optical element. The laser diode reflective back facet and the external frequency-selective reflector form an extended laser cavity. In operation, the multifrequency optical beam contains a plurality of longitudinal modes of the extended laser cavity which are confined within the frequency conversion bandwidth of the nonlinear element.
    Type: Grant
    Filed: December 22, 2003
    Date of Patent: February 7, 2006
    Assignee: JDS Uniphase Corporation
    Inventors: Robert G. Waarts, Nigel Copner
  • Publication number: 20040165639
    Abstract: A laser apparatus is disclosed utilizing a laser diode having a reflective back facet and a front facet having a reflectance of less than about 1% for emitting an optical beam at a fundamental frequency along an optical path. A collimating lens is provided for collimating the optical beam into a collimated beam. A transmission grating is optically coupled to receive the collimated beam and returns a portion of the collimated beam back into the laser diode by means of diffraction through lens and the laser diode front facet. The laser diode reflective back facet and the transmission grating form an extended laser cavity. In operation, a substantial portion of the collimated beam is transmitted through the transmission grating for producing the laser output beam propagating along the optical path.
    Type: Application
    Filed: November 4, 2003
    Publication date: August 26, 2004
    Applicant: JDS Uniphase Corporation, State of Incorporation: Delaware
    Inventors: Robert J. Lang, Robert G. Waarts
  • Publication number: 20040131093
    Abstract: A laser apparatus for nonlinear conversion of light is disclosed utilizing a laser diode having a reflective back facet and a front facet having a reflectance of less than about 1% for emitting a multifrequency optical beam, and a nonlinear optical element for receiving the multifrequency optical beam and for generating a frequency-converted radiation. An external frequency-selective reflector is provided for power and spectral stabilization of the multifrequency optical beam, and for confining its optical spectrum within a bandwidth of efficient nonlinear conversion in the nonlinear optical element. The laser diode reflective back facet and the external frequency-selective reflector form an extended laser cavity. In operation, the multifrequency optical beam contains a plurality of longitudinal modes of the extended laser cavity which are confined within the frequency conversion bandwidth of the nonlinear element.
    Type: Application
    Filed: December 22, 2003
    Publication date: July 8, 2004
    Applicant: JDS Uniphase Corporation
    Inventors: Robert G. Waarts, Nigel Copner
  • Publication number: 20040008991
    Abstract: The invention relates to the monitoring of polarization mode dispersion (PMD) using heterodyne detection for providing PMD compensation in optical networks, and an apparatus for monitoring PMD. In the present invention, a broadband PMD monitor is disclosed based on heterodyne detection with a tunable laser source which can be fed to a compensator such as an add/drop or other wavelength switch and polarization dependent attenuation means. A signal from a local oscillator is combined with an optical signal and the beat frequency amplitude and phase is analyzed for two orthogonal polarization states simultaneously to obtain a state of polarization. By averaging a plurality of polarization states within a channel, PMD can be estimated for compensation.
    Type: Application
    Filed: June 10, 2003
    Publication date: January 15, 2004
    Applicant: JDS UNIPHASE CORPORATION
    Inventors: Robert G. Waarts, Russell Chipman