Patents by Inventor Dmitri Oulianov

Dmitri Oulianov 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).

  • Publication number: 20200209640
    Abstract: A depolarizing homogenizer including one or more lenslet arrays, for providing a plurality of beamlets associated with different respective parts of a received beam. The depolarizing homogenizer includes a depolarizer comprising different areas which affect polarization differently, the depolarizer being positioned to cause alteration of the polarization characteristics of at least some of the plurality of beamlets. A lens is arranged to at least partially overlap the beamlets having the altered polarization characteristics.
    Type: Application
    Filed: August 24, 2018
    Publication date: July 2, 2020
    Applicant: NKT PHOTONICS A/S
    Inventors: Dmitri OULIANOV, Frederik NIELSEN, Irnis KUBAT, Thomas FEUCHTER, Timur ISKHAKOV
  • Publication number: 20190137403
    Abstract: The disclosed method and handheld analyzer of elemental concentration measurement is based on spectral analysis of high temperature highly ionized plasma generated by laser-generated pulses. Due to a high pulse energy and short pulse duration, high intensity singly and multiply charged ion lines in addition to neutral atomic lines are excited. The pulsed laser source of the disclosed analyzer is configured to output a train of pulses of signal light at a 1.5-1.6 signal wavelength at a pulse repetition rate from 0.1 to 50 kHz, pulses duration from 0.01 to 1.5 ns, pulse energy between 100 and 1000 uJ and has a beam spot on the surface of the sample varying 1 to 60 ?m. The above-described parameters provide at least a 20 GW/cm2 laser power density sufficient to induce a high temperature, highly ionized plasma (plasma) which allows measuring the carbon concentration in carbon steels by employing doubly charged ionic line CII with a detection limit down to 0.
    Type: Application
    Filed: April 11, 2017
    Publication date: May 9, 2019
    Inventors: Valentin GAPONTSEV, Ivan KURATEV, Roman BIRYUKOV, Ekaterina FEDYNA, Sergey PASHKO, Oleg MELOVATSKY, Andrey REZNIKOV, Nadezhda KOVYZHENKO, Dmitri OULIANOV
  • Patent number: 9036249
    Abstract: A method for sum-frequency conversion of coherent radiation includes generating two linearly polarized waves at different first f1 and second f2 frequencies (f2>f1), respectively, which coaxially propagate and are characterized in common case by arbitrarily located polarization planes. The waves are further guided through an optical active crystal which rotates their polarization planes at different angles ?1 and ?2 determined as ?1=?(f1)·L and ?2=?(f2)·L, where L is a length of the optical active crystal, and ?(f1) and ?(f2) specific rotations at respective frequencies f1 and f2. Finally the waves with the rotated polarization planes are incident on a non-linear crystal configured to generate a third frequency.
    Type: Grant
    Filed: January 22, 2013
    Date of Patent: May 19, 2015
    Assignee: IPG PHOTONICS CORPORATION
    Inventors: Valentin Gapontsev, Valentin Tartyshnyy, Oleg Vershinin, Boris Davidov, Dmitri Oulianov
  • Publication number: 20110311233
    Abstract: The present application is directed to an apparatus and method for the automated compensation of dispersion over a broad wavelength range for coherent optical pulses. In one embodiment, the present application discloses an automatic dispersion compensating optical apparatus configured to change chirp introduced into an optical signal by an optical system in optical communication with the dispersion compensating optical apparatus and includes at least one wavelength-tunable source of coherent optical pulses configured to output at least one optical signal, at least one dispersion compensation device configured to receive the optical signal from the coherent source, and at least one controller in communication with the dispersion compensation device and configured to adjust chirp introduced into the optical signal by the dispersion compensation device as the wavelength of the optical signal is varied.
    Type: Application
    Filed: May 19, 2011
    Publication date: December 22, 2011
    Inventors: Dmitri A. Oulianov, Stefan Marzenell, Richard Boggy
  • Patent number: 7962046
    Abstract: The present application is directed to an apparatus and method for the automated compensation of dispersion over a broad wavelength range for coherent optical pulses. In one embodiment, the present application discloses an automatic dispersion compensating optical apparatus configured to change chirp introduced into an optical signal by an optical system in optical communication with the dispersion compensating optical apparatus and includes at least one wavelength-tunable source of coherent optical pulses configured to output at least one optical signal, at least one dispersion compensation device configured to receive the optical signal from the coherent source, and at least one controller in communication with the dispersion compensation device and configured to adjust chirp introduced into the optical signal by the dispersion compensation device as the wavelength of the optical signal is varied.
    Type: Grant
    Filed: November 9, 2007
    Date of Patent: June 14, 2011
    Assignee: Newport Corporation
    Inventors: Dmitri A. Oulianov, Stefan Marzenell, Richard Boggy
  • Publication number: 20080112709
    Abstract: The present application is directed to an apparatus and method for the automated compensation of dispersion over a broad wavelength range for coherent optical pulses. In one embodiment, the present application discloses an automatic dispersion compensating optical apparatus configured to change chirp introduced into an optical signal by an optical system in optical communication with the dispersion compensating optical apparatus and includes at least one wavelength-tunable source of coherent optical pulses configured to output at least one optical signal, at least one dispersion compensation device configured to receive the optical signal from the coherent source, and at least one controller in communication with the dispersion compensation device and configured to adjust chirp introduced into the optical signal by the dispersion compensation device as the wavelength of the optical signal is varied.
    Type: Application
    Filed: November 9, 2007
    Publication date: May 15, 2008
    Applicant: Newport Corporation
    Inventors: Dmitri A. Oulianov, Stefan Marzenell, Richard Boggy