Patents by Inventor Tosifumi Yokohama

Tosifumi Yokohama 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).

  • Light source apparatus and its control method
    Publication number: 20040066807
    Abstract: A light source device can attain a stable output of a harmonic even when there occurs a change in the ambient temperature or fluctuation in the output power. The light source device is provided with a semiconductor laser source (4), an optical waveguide-type QPM-SHG device (5) for generating a second harmonic from light emitted from the semiconductor laser source (4), a wavelength control means (7) for controlling a wavelength of light emitted from the semiconductor laser source (4), a means for slightly fluctuating wavelength (8) for changing a wavelength of light emitted from the semiconductor laser source (4) and a means for detecting a change in output light power of the optical waveguide-type QPM-SHG device (5) that occurs when a wavelength of light emitted from the semiconductor laser source (4) is changed.
    Type: Application
    Filed: June 26, 2003
    Publication date: April 8, 2004
    Inventors: Ken?apos;ichi Kasazumi, yasuo Kitaoka, Tosifumi Yokohama, Kiminori Mizuuchi, Kazuhisa Yamamoto, Hisashi Senga, Shigeru Furumiya, Hiromichi Ishibashi