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
Respirator belt having bumper cushion
Vacuum cleaner filter adapter ring
Display screen with graphical user interface
Dot templates for object detection in images
Satellite communication network
Methods and systems for use in tracking targets for direction finding systems
System and method for generating profile morphing using cephalometric tracing data
  Randomly Featured Patents
Method and apparatus for handling data in television signals
Scrubber and muffler for exhaust gas from gas-powered valve actuators
Apparatus for the production of hexagonal phosphorus pentoxide
Cellulose/carboxymethyl cellulose mixtures useful for controlling fecal output, and methods employing them
Prostaglandin derivatives
Method for predicting a bi-predictive block of a moving picture
High solids coating compositions containing polycaprolactone polyol reactive diluents
Cart for ultrasonic diagnostic equipment
Reading stand for exerciser
Bathroom scale