Sökning: "laser diodes"
Visar resultat 6 - 10 av 32 avhandlingar innehållade orden laser diodes.
6. Design and fabrication of multiple quantum well structures for long wavelength laser diodes
Sammanfattning : InGaAsP multiple quantum well (MQW) structures emitting at1300 nm have been designed, fabricated with metal organicvapour phase epitaxy (MOVPE) and evaluated by x-ray diffraction(XRD), photoluminescence (PL) and by laser characterisation. Inaddition the structures were subject to scanning probemicroscopy (STM/AFM) and direct carrier transport measurements. LÄS MER
7. Gallium arsenide based buried heterostructure laser diodes with aluminium-free semi-insulating materials regrowth
Sammanfattning : Semiconductor lasers based on gallium arsenide and relatedmaterials are widely used in applications such as opticalcommunication systems, sensing, compact disc players, distancemeasurement, etc. The performance of these lasers can beimproved using a buried heterostructure offering lateralcarrier and optical confinement. LÄS MER
8. Synthesis of Conjugated Polymers: Photoactive Substances for Photonic Devices
Sammanfattning : Synthesis and characterization of conjugated polymers are the subject of this thesis, the goal of which is to synthesize polymers with properties that will make them suitable as the active materials in applications such as light-emitting diodes and microcavity laser devices. The two classes of conjugated polymers studied are poly(p-phenylenevinylenes) (PPVs) and polyfluorenes (PFs). LÄS MER
9. Optical Guiding and Feedback in Gallium Nitride Based Vertical Cavity Surface Emitting Lasers
Sammanfattning : The gallium-nitride (GaN) semiconductor material has been the core of the revolutionary breakthroughs during the last two decades in the lighting industry, by enabling manufacturing of efficient blue light emitting diodes (LEDs), for which the 2014 Nobel prize in physics was awarded. The GaN technology has further led to violet edge-emitting lasers (EELs), enabling the Blu-ray disk technology, and also to the commercialization of directly green emitting EELs. LÄS MER
10. Elements of AlGaN-Based Light Emitters
Sammanfattning : The III-nitrides have enabled a range of optoelectronic devices and associated applications of great industrial and societal importance. However, the full potential of the III-nitrides remains to be explored. LÄS MER