Resources Contact Us Home
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/ 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
Fastener driving tool
Customer initiated mobile diagnostics service
Implementing usage limited systems
System and method for providing television video conferencing using a computing device
Floating cell and island with a floating macrophyte filter
Harvesting arrangement for tree harvesting
Fuel injector provided with a metering servovalve of a balanced type for an internal-combustion engine
  Randomly Featured Patents
Employing a data structure of readily accessible units of memory to facilitate memory access
Method for manufacturing a wiring board
Methanol conversion using reactivated zeolite
Method and apparatus for respiratory audio-visual biofeedback for imaging and radiotherapy
Low temperature photochemical vapor deposition of alloy and mixed metal oxide films
Method and system of providing network addresses to in-premise devices in a utility network
Method for culturing avian spermatogonial stem cells and avian spermatogonial stem cells prepared thereby
Neoregelia plant named `Yang`
Bio-electric sensor and switch system for medical imaging
Multilayer ceramic capacitor