Patents by Inventor David James Spence
David James Spence 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: 11322905Abstract: A single longitudinal mode ring Raman laser including: a pump source outputting a pump light power, resonantly coupled to a first ring resonator; a optical measurement and piezo-actuator for stabilising the resonant coupling of the pump light power to a first ring resonator; a first ring resonator including a Raman gain medium, wherein the Raman gain medium receives the pump light power and undergoes Raman lasing generating resonated Stokes power at the corresponding Stokes output wavelength; the first ring resonator acting as a feedback loop for the pump light power and the resonated Stokes power and outputting a portion of the Stokes power as the laser output.Type: GrantFiled: December 22, 2017Date of Patent: May 3, 2022Assignee: Macquarie UniversityInventors: David James Spence, Ondrej Kitzler, Jipeng Lin, Richard Paul Mildren, Helen M. Pask, Graeme P. A. Malcolm, Nils Hempler, Stephen Webster
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Publication number: 20210075182Abstract: A single longitudinal mode ring Raman laser including: a pump source outputting a pump light power, resonantly coupled to a first ring resonator; a optical measurement and piezo-actuator for stabilising the resonant coupling of the pump light power to a first ring resonator; a first ring resonator including a Raman gain medium, wherein the Raman gain medium receives the pump light power and undergoes Raman lasing generating resonated Stokes power at the corresponding Stokes output wavelength; the first ring resonator acting as a feedback loop for the pump light power and the resonated Stokes power and outputting a portion of the Stokes power as the laser output.Type: ApplicationFiled: December 22, 2017Publication date: March 11, 2021Applicant: Macquarie UniversityInventors: David James Spence, Ondrej Kitzler, Jipeng Lin, Richard Paul Mildren, Helen M. Pask, Graeme P. A. Malcolm, Nils Hempler, Stephen Webster
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Patent number: 10944232Abstract: A frequency electromagnetic radiation generation system including: a non linear crystal producing THz frequency electromagnetic radiation; a fundamental beam that interacts with the non linear crystal thereby emitting a THz frequency electromagnetic radiation emission; a silicon intermediary coupled to the non linear crystal for output channeling the THz frequency electromagnetic radiation emission to an output environment; the system utilising a fundamental beam which has a photon energy below the bandgap energy of silicon.Type: GrantFiled: March 23, 2018Date of Patent: March 9, 2021Assignee: Macquarie UniversityInventors: Andrew Lee, Helen M. Pask, David James Spence
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Publication number: 20200014166Abstract: A frequency electromagnetic radiation generation system including: a non linear crystal producing THz frequency electromagnetic radiation; a fundamental beam that interacts with the non linear crystal thereby emitting a THz frequency electromagnetic radiation emission; a silicon intermediary coupled to the non linear crystal for output channeling the THz frequency electromagnetic radiation emission to an output environment; the system utilising a fundamental beam which has a photon energy below the bandgap energy of silicon.Type: ApplicationFiled: March 23, 2018Publication date: January 9, 2020Inventors: Andrew LEE, Helen M. PASK, David James SPENCE
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Publication number: 20190280456Abstract: A Raman Laser device having an nth Stokes shifted output the device including: a laser pump input; a lasing cavity having feedback elements at each end; and a diamond Raman active gain medium within the cavity, exhibiting first and higher Stokes emissions when subjected to pumping by the laser pump input; wherein the feedback elements feeding back the pump input, and 1st Stokes output from the gain medium, and a gain portion of the higher Stokes outputs, with a transmitting portion of the nth Stokes output being the output of the device.Type: ApplicationFiled: September 21, 2017Publication date: September 12, 2019Applicant: Macquarie UniversityInventors: Robert Williams, Richard Paul Mildren, David James Spence, Oliver Lux
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Publication number: 20180323572Abstract: A Raman laser device including: a Raman lasing medium adapted to undergo Raman lasing; and at least one pumping beam, for pumping a Stokes seed beam by stimulated Raman scattering whilst it traverses the Raman lasing medium.Type: ApplicationFiled: November 18, 2016Publication date: November 8, 2018Inventors: Richard Paul Mildren, Aaron McKay, David James Spence, David Coutts
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Patent number: 9941660Abstract: A tunable lasing device including a vertical external cavity surface emitting laser, adapted to generate a fundamental laser beam in response to pumping from a pump source, said fundamental laser beam having a fundamental wavelength and a fundamental linewidth; a fundamental resonator cavity adapted to resonate the fundamental beam therein; a first optical element located within the fundamental resonator cavity for control of the fundamental linewidth of the fundamental beam; a Raman resonator located at least partially in said fundamental resonator adapted to receive the fundamental beam and comprising therein, a solid state Raman active medium located therein for generating at least a first Stokes beam from the fundamental beam wherein said Raman resonator cavity is adapted to resonate said Stokes beam therein and further adapted to emit an output beam; and further comprising a nonlinear medium located within the Raman resonator cavity for nonlinear frequency conversion of at least one of the beams presentType: GrantFiled: November 9, 2012Date of Patent: April 10, 2018Assignee: Macquarie UniversityInventors: Jipeng Lin, Helen M. Pask, David James Spence, Craig J. Hamilton, Graeme P. A. Malcolm
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Patent number: 9837787Abstract: A method and system for generating a Raman second Stokes light to a source light comprising generating a Raman first Stokes light from the source light by a Raman interaction in a nonlinear optical medium disposed in an optical resonator, and resonating the Raman first Stokes light in the optical resonator; generating a seed light at the frequency of the Raman second Stokes light from the source light and the Raman first Stokes light by a four wave mixing process which is not phase matched in the nonlinear medium; amplifying the seed light by transferring power from the first Stokes light resonating in the optical resonator to the seed light using a Raman amplification process in the nonlinear medium; and extracting from the optical resonator a majority of the power of the seed light so amplified.Type: GrantFiled: November 27, 2014Date of Patent: December 5, 2017Assignee: MACQUARIE UNIVERSITYInventors: David James Spence, David Coutts, Richard Paul Mildren, Helen Margaret Pask, Jipeng Lin, Aravindan Warrier
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Publication number: 20170163004Abstract: A method and system for generating a Raman second Stokes light to a source light comprising generating a Raman first Stokes light from the source light by a Raman interaction in a nonlinear optical medium disposed in an optical resonator, and resonating the Raman first Stokes light in the optical resonator; generating a seed light at the frequency of the Raman second Stokes light from the source light and the Raman first Stokes light by a four wave mixing process which is not phase matched in the nonlinear medium; amplifying the seed light by transferring power from the first Stokes light resonating in the optical resonator to the seed light using a Raman amplification process in the nonlinear medium; and extracting from the optical resonator a majority of the power of the seed light so amplified.Type: ApplicationFiled: November 27, 2014Publication date: June 8, 2017Inventors: David James SPENCE, David COUTTS, Richard Paul MILDREN, Helen Margaret PASK, Jipeng LIN, Aravindan WARRIER
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Publication number: 20150325976Abstract: A laser configured to optimise output power at a desired wavelength, by suppression of unwanted Stokes orders in a Raman cascade, the laser comprising a resonating structure configured to resonate precursor light and Raman light frequencies, having a Raman medium configured to interact with the precursor resonating light to generate the Raman light; a control nonlinear medium configured to reduce an extraction of power from the precursor resonating light by the Raman process; and an output nonlinear medium configured to interact with the precursor resonating light to generate a desired output light thereby extracting power from the precursor resonating light; whereby the control nonlinear medium reduces the extraction of power from the precursor resonating light by the Raman process to enhance the extraction of power from the precursor resonating light by the output nonlinear medium interacting with the precursor resonating light thereby increasing the power of desired output the light.Type: ApplicationFiled: July 5, 2013Publication date: November 12, 2015Applicant: Macquarie UniversityInventors: David James Spence, Helen Margaret Pask, Andrew Lee
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Publication number: 20140269787Abstract: A tunable lasing device including a vertical external cavity surface emitting laser, adapted to generate a fundamental laser beam in response to pumping from a pump source, said fundamental laser beam having a fundamental wavelength and a fundamental linewidth; a fundamental resonator cavity adapted to resonate the fundamental beam therein; a first optical element located within the fundamental resonator cavity for control of the fundamental linewidth of the fundamental beam; a Raman resonator located at least partially in said fundamental resonator adapted to receive the fundamental beam and comprising therein, a solid state Raman active medium located therein for generating at least a first Stokes beam from the fundamental beam wherein said Raman resonator cavity is adapted to resonate said Stokes beam therein and further adapted to emit an output beam; and further comprising a nonlinear medium located within the Raman resonator cavity for nonlinear frequency conversion of at least one of the beams presentType: ApplicationFiled: November 9, 2012Publication date: September 18, 2014Applicant: Macquarie UniversityInventors: Jipeng Lin, Helen M. Pask, David James Spence, Craig J. Hamilton, Graeme P. Malcolm
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Patent number: 8345717Abstract: A continuous wave Raman laser for producing visible laser output comprising: a resonator cavity; at least a first reflector and a second reflector said first and second reflectors being located at opposite ends of the resonator cavity; a laser gain medium located in the resonator cavity for generating a continuous wave fundamental beam which resonates within the resonator cavity when pumped by a pump beam from a pump source external to the resonator cavity; a solid Raman-active medium positioned in the resonator cavity for Raman shifting the fundamental beam to produce a continuous wave Raman beam which resonates within the resonator cavity; and a non-linear medium positioned in the resonator cavity for frequency converting the continuous wave Raman beam to a converted wavelength to produce a continuous wave converted beam.Type: GrantFiled: April 5, 2007Date of Patent: January 1, 2013Assignee: Macquarie UniversityInventors: Peter Dekker, Helen Margaret Pask, James Austin Piper, David James Spence
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Publication number: 20120263196Abstract: A Raman laser system, the system comprising a resonator cavity comprising a plurality of reflectors, wherein at least one reflector is an output reflector adapted for outputting a pulsed output beam from the resonator cavity at a frequency corresponding to a Raman shifted frequency of the pump beam, wherein the output reflector is partially transmitting at the Raman-converted frequency; a solid state Raman-active medium located in the resonator cavity to be pumped by a pulsed pump beam having a pump repetition rate and for Raman-converting a pump pulse incident on the Raman-active medium to a resonating pulse at a Raman-converted frequency resonating in the resonator cavity; a resonator adjuster for adjusting the optical length of the resonator to match the round-trip time of the resonating Raman-converted pulse with the pump beam repetition rate such that the resonating pulse is coincident both temporally and spatially with a pump pulse in the Raman-active medium on each round trip, to Raman amplify the resoType: ApplicationFiled: December 22, 2010Publication date: October 18, 2012Inventors: Helen Margaret Pask, David James Spence, Eduardo Granados, Richard Paul Mildren
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Publication number: 20100054284Abstract: A continuous wave Raman laser for producing visible laser output comprising: a resonator cavity; at least a first reflector and a second reflector said first and second reflectors being located at opposite ends of the resonator cavity; a laser gain medium located in the resonator cavity for generating a continuous wave fundamental beam which resonates within the resonator cavity when pumped by a pump beam from a pump source external to the resonator cavity; a solid Raman-active medium positioned in the resonator cavity for Raman shifting the fundamental beam to produce a continuous wave Raman beam which resonates within the resonator cavity; and a non-linear medium positioned in the resonator cavity for frequency converting the continuous wave Raman beam to a converted wavelength to produce a continuous wave converted beam.Type: ApplicationFiled: April 5, 2007Publication date: March 4, 2010Inventors: Peter Dekker, Helen Margaret Pask, James Austin Pipes, David James Spence
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Patent number: D1031964Type: GrantFiled: April 26, 2021Date of Patent: June 18, 2024Assignee: Reckitt & Colman (Overseas) Hygiene Home LimitedInventors: Warz Choi, Jeremy Dodd, Emily Christina Giversen, Miles Andrew Kilburn, Tangent Lu, Blake John Parkinson, Samuel James Roper, David Sanders, James Peter Spence, Fengyang Wang, Jake Stephen Williams, Christopher Brian Witty, Jin Wu, George Zhang