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 apparatus for color conversion based on LCH color space, and liquid crystal display device
Method for texturizing virtual three-dimensional objects
Lamp
Receiver for home theaters
Multi-channel sessions
Image forming apparatus and display method for displaying different component information based on a type of user of the image forming apparatus
Self-adaptive power amplification
  Randomly Featured Patents
Autotensioner
Ferulic acid dimers and their pharmaceutically acceptable salts, their preparation and use thereof for treating dementia
Controller capable of self-monitoring, redundant storage system having the same, and method thereof
Seal for floating roof tank
Airbag system with controlled inflation
Self leveling camera support apparatus
Stroller and backrest recline device thereof
Excavator tooth, holder therefor and staple retainer
Doll
High tension circuit breaker with low operating energy