Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Extended wavelength strained layer lasers having strain compensated layers










Image Number 3 for United States Patent #6359920.

Several methods are used in novel ways with newly identified and viable parameters to decrease the peak transition energies of the pseudomorphic InGaAs/GaAs heterostructures. These techniques, taken separately or in combination, suffice to permit operation of light emitting devices at wavelengths of 1.3 .mu.m or greater of light-emitting electro-optic devices. These methods or techniques, by example, include: (1) utilizing new superlattice structures having high In concentrations in the active region, (2) utilizing strain compensation to increase the usable layer thickness for quantum wells with appropriately high In concentrations, (3) utilizing appropriately small amounts of nitrogen (N) in the pseudomorphic InGaAsN/GaAs laser structure, and (4) use of nominal (111) oriented substrates to increase the usable layer thickness for quantum wells with appropriately high In concentrations. In all of the above techniques, gain offset may be utilized in VCSELs to detune the emission energy lower than the peak transition energy, by about 25 meV or even more, via appropriate DBR spacing. Gain offset may also be utilized in some forms of in-plane lasers. Increased temperature may also be used to decrease peak transition energy (and therefore the emission energy) by about 50 meV/100.degree. C. All these techniques are furthermore applicable to other material systems, for example, extending the emission wavelength for laser diodes grown on InP substrates. Additionally, structures which utilize the above techniques are discussed.








 
 
  Recently Added Patents
Method and system for providing magnetic junctions having improved characteristics
Tap initialization of equalizer based on estimated channel impulse response
Method and system for a low-power client in a wide area network
Integrated control system for stability control of yaw, roll and lateral motion of a driving vehicle using an integrated sensing system to determine longitudinal velocity
Dual source mass spectrometry system
Information distribution system, information distributing method, node, and recording medium
Toy
  Randomly Featured Patents
Spray nozzle and method of manufacturing same
Differential signal receiver and method
Production process of polyphenol diesters, and positive photosensitive compositions
Low voltage battery pack monitoring circuit with adjustable set points
Authentication method and system
Low energy fuse and method of manufacture
Vehicular electronic system with crash sensors and occupant protection systems
Beacon detection system for sharing spectrum between wireless communications systems and fixed microwave systems
Polarization converter, an illumination optical device having the polarization converter and projector
Boot failure recovery