Patents by Inventor Yoshihiko Masa

Yoshihiko Masa 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).

  • Wavelength conversion element
    Patent number: 8472106
    Abstract: A wavelength conversion element 20 has a periodic polarization reversal structure formed in a non-linear optical crystal, wherein positive/negative polarity is periodically alternated in period d expressed by the following formula (1), outputs light having frequency of 2? from the incident light having frequency of ?, and is characterized in that the non-linear optical crystal is a nitride single crystal: d=m?/[2(n2??n?)]??(1) where, m represents the order of phase matching, ? represents the wavelength of the incident light, n? represents the refractive index of the nitride single crystal such as AlN for the light having frequency of ?, and n2? represents the refractive index of the nitride single crystal such as AlN for the light having frequency of 2?.
    Type: Grant
    Filed: December 12, 2008
    Date of Patent: June 25, 2013
    Assignee: National Institute for Materials Science
    Inventors: Yoshihiko Masa, Kiyoshi Shimamura, Villora Encarnacion Antonia Garcia
  • WAVELENGTH CONVERSION ELEMENT
    Publication number: 20110019266
    Abstract: A wavelength conversion element 20 has a periodic polarization reversal structure formed in a non-linear optical crystal, wherein positive/negative polarity is periodically alternated in period d expressed by the following formula (1), outputs light having frequency of 2? from the incident light having frequency of ?, and is characterized in that the non-linear optical crystal is a nitride single crystal: d=m?/[2(n2??n?)]??(1) where, m represents the order of phase matching, ? represents the wavelength of the incident light, n? represents the refractive index of the nitride single crystal such as AlN for the light having frequency of ?, and n2? represents the refractive index of the nitride single crystal such as AlN for the light having frequency of 2?.
    Type: Application
    Filed: December 12, 2008
    Publication date: January 27, 2011
    Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE
    Inventors: Yoshihiko Masa, Kiyoshi Shimamura, Villora Encarnacion Antonia Garcia