Patents Represented by Attorney Andrew G. Istzwan

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  • Quantum-dot cascade laser
    Patent number: 5963571
    Abstract: A quantum-dot cascade laser which eliminates undesirable single phonon decays associated with quantum-well devices. The elimination of single phonon decays is realized by a three-dimensional confinement resulting in a several-order-of-magnitude reduction in the threshold current. Vertical radiative transitions are employed within single quantum dots contained by Bragg reflectors. Dot size, dot density and dot uniformity requirements are presented along with several embodiments.
    Type: Grant
    Filed: June 30, 1997
    Date of Patent: October 5, 1999
    Assignee: NEC Research Institute, Inc.
    Inventor: Ned S. Wingreen