Patents Assigned to Coherent Technologies
  • Patent number: 5835199
    Abstract: The present invention provides a laser radar (ladar) imaging system in which both the range of an object being imaged and the velocity of the object can be measured simultaneously and accurately with superior range resolution and with minimal ambiguity. Use is made of a ladar system based on matched-filter cross-correlation of light pulse waveforms that have multiple, simultaneous frequency components with phase variation and incommensurate spectral frequency spacing between frequency components.
    Type: Grant
    Filed: May 17, 1996
    Date of Patent: November 10, 1998
    Assignee: Coherent Technologies
    Inventors: Mark W. Phillips, Paul J. M. Suni, J. Alex L. Thomson
  • Patent number: 5835642
    Abstract: The invention is related to technical physics, in particular to devices for investigating the internal structure of objects and can be used in medicine for diagnostics of human organs and systems, in particular for optical coherence tomography and in technical diagnostics, for example technological process control. The invention relates to the creation of an optical-fiber interferometer, which, being used in a device for optical coherence tomography, allows one to investigate media with short time of changing of optical characteristics or its position relative to the optical probe, for example biotissues in vivo. The invention also relates to the creation of a piezoelectric modulator, suitable for use in the interferometer and for providing the necessary scanning depth in the mentioned media.
    Type: Grant
    Filed: March 3, 1997
    Date of Patent: November 10, 1998
    Assignee: Optical Coherence Technologies, Inc.
    Inventors: Valentin M. Gelikonov, Grigory V. Gelikonov, Natalia D. Gladkova, Vladimir I. Leonov, Felix I. Feldchtein, Alexander M. Sergeev, Yakov I. Khanin
  • Patent number: 5815250
    Abstract: In a laser radar (lidar) system, a Doublet Pulse is generated by injection-seeded aborted cavity dumping of a solid-state laser. The doublet pulse provides coherent Doppler lidar systems a substantial time bandwidth product (TB) with a very modest processing requirement. The waveform format comprises a pair of pulselets, each of duration .tau., separated by T seconds. The range resolution is governed by the pulselet duration .tau., while the velocity precision is governed by one over the pulselet separation, T. Ambiguities in the velocity measurement arise as a result of the periodic structure of the waveform and occur every .lambda./2T m/sec, where .lambda. is the operating wavelength. These ambiguities are removed by conventional de-aliasing algorithms as well as through the generation and processing of higher order pulse waveforms.
    Type: Grant
    Filed: May 27, 1997
    Date of Patent: September 29, 1998
    Assignee: Coherent Technologies, Inc.
    Inventors: J. Alex Thomson, Stephen M. Hannon, Sammy W. Henderson
  • Patent number: 5572541
    Abstract: A composite, glass or crystalline laser rod having a doped, light-absorbing core portion surrounded by a transparent cladding portion that is either undoped or doped with a nonabsorbing material is side-pumped with a plurality of laser diodes dispersed angularly around the laser rod. A reflective coating or sleeve substantially surrounds the laser rod, except for entrance slits for the pump light, to confine unabsorbed pump light in the crystalline laser rod by reflecting and re-reflecting the pump light in the rod to increase the likelihood of absorption by the core portion. The reflective coating is substantially reflective of all the pump light, but it can be transparent to laser radiation emission by the rod. An absorptive coating that absorbs radiation of the wavelength of the laser radiation emission of the rod can be positioned around the outside of the reflective coating to absorb lateral laser emission of the rod.
    Type: Grant
    Filed: October 13, 1994
    Date of Patent: November 5, 1996
    Assignee: Coherent Technologies, Inc.
    Inventor: Paul J. M. Suni