摘要:
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 μm 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° 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.
摘要:
A novel electro-opto-mechanical assembly is provided. The electro-opto-mechanical assembly comprising: a first wafer, the wafer having a top and bottom surface; at least one optical element disposed on one surface of the first wafer; at least one discrete opto-electronic transducer element disposed on the bottom surface of the first wafer and in optical communication with the optical element; and an optical waveguide; wherein the first wafer and the optical element form an optical relay which relays light between the discrete opto-electronic transducer and the optical waveguide and thereby forms an efficient optical coupling between the discrete opto-electronic transducer and the optical waveguide.
摘要:
A novel approach for providing temperature compensation for semiconductor lasers is disclosed. This approach utilizes reflectivity characteristics in the at least one of the mirrors of the semiconductor laser to provide temperature compensation to the device.
摘要:
A conductive element with a lateral oxidation barrier is provided for the control of lateral oxidation processes in semiconductor devices such as lasers, vertical cavity surface emitting lasers and light emitting diodes. The oxidation barrier is formed through modification of one or more layers which initially were receptive to oxidation. The quality of material directly below the oxidation barrier may be preserved. Related applications include the formation of vertical cavity surface emitting lasers on non-GaAs substrates and on GaAs substrates.
摘要:
A method for fabricating a semiconductor device is provided in which a first layer having a first conductivity type is grown, a current aperture region comprising at least one layer of an oxidizable material is grown, a second layer is grown, an impurity material is diffused through a first region of the layer of oxidizable material to decrease the susceptibility to oxidation in the first region and to provide a conductive channel through the layer of oxidizable material, the semiconductor device is etched to expose a sidewall of the oxidizable layer, and the oxidizable layer is oxidized in a region outside of the first region to form an oxidized region while leaving at least a portion of the first region non-oxidized to form a current aperture in the oxidizable layer.
摘要:
A lens having at least one oxidized layer is provided. Numerous structures for the lens are discussed. Additionally, methods for manufacturing the lens are also discussed. The methods include: 1) variation in thickness of oxidizable layers; 2) variation in thickness of non-oxidizable layers; 3) variation in Al concentration of oxidizable layers; 4) variation in Al concentration of non-oxidizable layers; 5) variation in doping concentration of oxidizable layers; 6) use of interdiffusion between oxidizable and non-oxidizable; 7) local variation in ion implantation dose; and 8) variation in mesa diameter.
摘要:
An improved lens structure is provided which reduces the scattering and/or reflection losses in an optical cavity. The lens comprising at least a first, second and third lens layer arranged vertically, the first and third lens layers being oxidized in first and third oxidized regions adjacent to first and third non-oxidized regions, the second layer disposed between the first and third layers and comprising a non-oxidized semiconductor material, the first and third non-oxidized regions comprising a semiconductor material, each of the oxidized regions having an aluminum contents greater than 20%; and appropriately spacing the first lens layer from the third lens layer to reduce the scattering and/or reflection losses in an optical cavity.
摘要:
An optical memory system employing multiple reading/writing optical beams from solid state lasers for simultaneously reading from a writing to multiple tracks of optical media to allow reading/writing of closely spaced adjacent tracks, a number a feature are disclosed. These include using vertical writing surface emitting lasers forming an array of beam sources, using lenslets associated with array, modulating the beams, and providing various optical elements and combinations of optical elements to compensate for beam and system imperfections.
摘要:
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) sue 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.