InGaAs quantum dots (QDs) grown by strained-layer epitaxy on GaAs can accommodate more In than planar growth and present an interesting approach for realizing GaAs-based laser diodes that operate in the 1.1 to 1.3 /spl mu/m wavelength range. Although QD emission wavelengths as long as 1.3 /spl mu/m have been reported, lasing in edge-emitting devices has been limited to wavelengths just over 1.0 /spl mu/m. Recently, we found that for optimized growth conditions, QD electroluminescence efficiency at 1.3 /spl mu/m is comparable to good InGaAs quantum wells emitting at 0.98 /spl mu/m. In particular, the use of separate and alternating sub-monolayer depositions increases the emission wavelength to 1.3 /spl mu/m and leads to high electroluminescence efficiency, while keeping the total In content of the deposited material to a minimum to avoid excessive strain. We describe the influence of growth method on the formation and emission characteristics of self-assembled InGaAs/GaAs QDs and describe device characteristics from edge emitting lasers using these QD active regions.
InGaAs/GaAs quantum dot lasers
1998-01-01
184695 byte
Conference paper
Electronic Resource
English
InGaAs/GaAs Quantum Dot Lasers
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