Patents Assigned to Nihon Kessho Kogaku Co., Ltd.
  • Lithium niobate crystal wafer, process for the preparation of the same, and method for the evaluation thereof
    Patent number: 5437761
    Abstract: A lithium niobate crystal wafer wherein the deviations of the maximum and minimum absorption coefficients of the wafer at a wavelength of 2.87 .mu.m from the average absorption coefficient thereof at that wavelength fall within the range of .+-.0.1 cm.sup.-1 exclusive of both borders; a process for the preparation of the same; and a method for the evaluation thereof.
    Type: Grant
    Filed: March 4, 1994
    Date of Patent: August 1, 1995
    Assignee: Nihon Kessho Kogaku Co., Ltd.
    Inventor: Akira Koide