Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 6 of 6 for “"differential quantum efficiency"”.
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Improving the efficiency and threshold current of photonic crystal vertical-cavity surface-emitting lasers
… to achieve high power, low threshold, and high efficiency single mode VCSELs. Various mechanisms that affect the differential quantum efficiency and threshold current of the proton-implanted and oxide-confined photonic crystal vertical-cavity surface-emitting lasers (VCSELs) are studied. Three …
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Simulation, Fabrication, and Characterization of Semiconductor Lasers
… 892 nm to 898 nm for all the lasers. External differential quantum efficiency is measured for different cavity lengths from which internal quantum efficiency is found 85.5% and also internal loss 5.85 cm−1. Finally, the characteristic temperature for the diode laser is found 208.3 0C. It is …
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Noise and synamics in semiconductor lasers
… of producing more than one photon, and the differential quantum efficiency of cascade lasers can be much larger than that of conventional semiconductor lasers. The photon emission events in different gain stages in cascade lasers are highly positively correlated, and these correlations …
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Monolithic Integration Of Dual Optical Elements On High Power Semicond
… for sub-micron features. The grating diffraction efficiency is estimated to be higher than 95% using a detailed analysis of the losses mechanisms of the device. The grating reflectivity is estimated to be as low as 2.10-4. The low reflectivity of the light extraction process is shown to increase …
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Fabrication and Characterization of Optoelectronics Devices Based on III-V Materials for Infrared Applications by Molecular Beam Epitaxy
… of this thesis focuses on the three types of quantum well (QW) lasers; phosphor-free1.3µm InAlGaAs strain-compensated multiple-quantum-well (SCMQW) lasers on InP (100), InGaAsNSb/GaAs quantum wells (QWs) grown on GaAs (411)A substrates and mid-infrared InGaAsSb lasers with digitally grown …
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GaAs-based quantum well and quantum dot light-emitting diodes and lasers for 1.3 and 1.55 um emission
… part is dedicated to the study of GalnNAs/GaAs quantum well (QW)-based devices. On the other hand, the second part focuses on the study of devices based on In As quantum dots (QDs) covered either by GalnNAs or GaAsSb capping layers. GalnNAs/GaAs QW-based devices. The first part of the thesis is …