Resources Contact Us Home
Electrically pumped edge-emitting photonic bandgap semiconductor laser

Image Number 5 for United States Patent #6674778.

A highly efficient, electrically pumped edge-emitting semiconductor laser based on a one- or two-dimensional photonic bandgap (PBG) structure is described. The laser optical cavity is formed using a pair of PBG mirrors operating in the photonic band gap regime. Transverse confinement is achieved by surrounding an active semiconductor layer of high refractive index with lower-index cladding layers. The cladding layers can be electrically insulating in the passive PBG mirror and waveguide regions with a small conducting aperture for efficient channeling of the injection pump current into the active region. The active layer can comprise a quantum well structure. The quantum well structure can be relaxed in the passive regions to provide efficient extraction of laser light from the active region.

  Recently Added Patents
Character input device and program for displaying next word candidates based on the candidates' usage history
Network-based dynamic encoding
Method of using N-thio compounds for oligonucleotide synthesis
Multiplexing channels by a medium access controller
Method and system for the assignment of security group information using a proxy
Ink, ink jet recording method, ink cartridge, and ink jet recording apparatus
Identifying a characteristic of an individual utilizing facial recognition and providing a display for the individual
  Randomly Featured Patents
Holographic filter with a wide angular field of view and a narrow spectral bandwidth
Insurance product, rating system and method
Averaging cell mismatches in integrated circuits
Cephalosporin derivative
Method for manufacturing an array of interferometeric modulators
Electrostatic image developing method and apparatus using a drum photoconductor and hard magnetic carriers
Process for the cryogenic distillation of an air feed to produce an ultra-high purity oxygen product
Plastic container with horizontally oriented panels
Method of printing