Patents by Inventor Hoi Jun Yoo

Hoi Jun Yoo 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).

  • Patent number: 5034958
    Abstract: A front-surface emitting, vertical-cavity laser and its method of making in which a vertical laser cavity with Bragg reflectors and an active layer, preferably formed by a quantum well, is formed on a substrate. Lateral current confinement is achieved by implanting a conductivity-reducing ion into the region surrounding the quantum well. Electrical contact to the upper side of the active layer is achieved by implanting a conductivity-increasing ion into the region surrounding the cavity between the active layer and the upper reflector. By such an electrical contact, the upper reflector can advantageously be composed of dielectric layers. Light is then emitted through the upper reflector.
    Type: Grant
    Filed: April 19, 1990
    Date of Patent: July 23, 1991
    Assignee: Bell Communications Research, Inc.
    Inventors: Young-Se Kwon, Hoi-Jun Yoo