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
System and method for data reconfiguration in an optical communication network
Semiconductor device
Integrated circuit devices having conductive structures with different cross sections
Editing device and editing method
DKK1 oncogene as therapeutic target for cancer and a diagnosing marker
Method of stimulating tissue healing
Method for superconducting connection between MgB2 superconducting wires via a MgB2 matrix made from a boron powder compressed element infiltrated with Mg
  Randomly Featured Patents
Optical detection system
Accumulating conveyor system
Bath composition
Positive electrode active material for alkaline storage batteries, positive electrode for alkaline storage batteries, and alkaline storage battery
Multicylinder compound engine
Energy barrier, a rail for a building frame cavity insulation system and a method of assembling stacked layers of reflective dead air spaces
Data processing apparatus that processes incoming bits
Stretch film cling enhancement by addition of elastomers
Methylenedioxy quino-benzothiazine derivatives
High temperature lubricant