Patents Assigned to Kiyotaka Miura
  • Optical device and formation of optical waveguide using light-induced effect on refractive index
    Patent number: 6154593
    Abstract: A glass 1 is irradiated with a focused pulsed laser beam 2 having a peak power density of 10.sup.5 W/cm.sup.2 or more and a repetition rate of 10 KHz or more. The glass 1 irradiated with the laser beam 2 changes its refractive index at the focal point 4. During the laser beam irradiation, the glass 1 is continuously moved with respect to the focal point of the pulsed laser beam 2 or continuously scanned with the focused laser beam 2, so as to form the refractive index changed region (i.e. an optical waveguide 5) with a predetermined pattern. The glass 1 in which the optical waveguide 5 will be formed may be any kind of glass having high transparency.
    Type: Grant
    Filed: June 15, 1999
    Date of Patent: November 28, 2000
    Assignees: Japan Science & Technology Corp, Kiyotaka Miura
    Inventors: Kiyotaka Miura, Kenneth M. Davis, Kazuyuki Hirao
  • Optical device and formation of optical waveguide using light-induced effect on refractive index
    Patent number: 5978538
    Abstract: A glass is irradiated with a focused pulsed laser beam having a peak power density of 10.sup.5 W/cm.sup.2 or more and a repetition rate of 10 KHz or more. The glass irradiated with the laser beam changes its refractive index at the focal point. During the laser beam irradiation, the glass is continuously moved with respect to the focal point of the pulsed laser beam or continuously scanned with the focused laser beam, so as to form the refractive index changed region (i.e. an optical waveguide) with a predetermined pattern. The glass in which the optical waveguide is formed may be any kind of glass having high transparency.
    Type: Grant
    Filed: March 17, 1997
    Date of Patent: November 2, 1999
    Assignees: Japan Science & Technology Corp., Kiyotaka Miura
    Inventors: Kiyotaka Miura, Kenneth M. Davis, Kazuyuki Hirao