Milton Peabody

University of Maine; Orono

Electricial Engineering

• BROADBAND CASCADE LIGHT EMITTERS

  Publication number: 20060007973

  Abstract: A broadband CLE capable of operation simultaneously at multiple wavelengths comprises: a core region including a multiplicity or cascade of stages, each stage including a radiative transition region. A first group of stages emits radiation at a first wavelength and at a first aggregate intensity per group, and a second group of stages emits radiation at a second wavelength and at a second aggregate intensity per group lower than the first intensity. The invention is characterized in that the second group has more stages than said first group, and the per-stage intensity of the first group is greater than that of the second group. This design reduces the difference between said first and second aggregate intensities. In one embodiment, groups that are located at or near to the ends of the cascade have more stages than groups that are centrally located within the cascade regardless of their wavelength.

  Type: Application

  Filed: June 19, 2003

  Publication date: January 12, 2006

  Inventors: Federico Capasso, Alfred Cho, Claire Gmachl, Milton Peabody, Arthur Sergent, Deborah Sivco, Alexander Soibel

• PHASE MATCHED PARAMETRIC LIGHT GENERATION IN MONOLITHICALLY INTEGRATED INTERSUBBAND OPTICAL DEVICES

  Publication number: 20050213195

  Abstract: An optical device comprises a cavity resonator and an intracavity ridge waveguide. The ridge waveguide includes a monolithically integrated intersubband core region and a nonlinear mixing region (NMR). In response to external pumping energy the core region generates laser light at a first frequency and in a first transverse mode. In response to the laser light the NMR generates parametric light at a second frequency and in a second transverse mode. For phase matching the effective-refractive-index-versus-ridge-width characteristics of the modes of the laser and the parametric light intersect one another at a phase matching width and so that, at greater widths, the effective refractive index of the mode of the higher frequency light is less than that of the lower frequency light. For true phase matching the width of the ridge is made to be essentially equal to the phase matching width.

  Type: Application

  Filed: March 29, 2004

  Publication date: September 29, 2005

  Inventors: Alexey Belyanin, Alfred Cho, Claire Gmachl, Oana Malis, Milton Peabody, Arthur Sergent, Deborah Sivco