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Electro Optical Characterisation of Short Wavelength Semiconductor ...

Electro Optical Characterisation of Short Wavelength Semiconductor ...

Preface I’m not bound

Preface I’m not bound to please thee with my answers. William Shakespeare It was summer of 2006 as I came to Bremen. An engineering student who wants to try his chances and capabilities in physics. No simple pace. A challenging way to be. Lasers have been always fascinating; as they were introduced in lectures of optical communications, as I used them as tools for making holograms and measuring luminescence spectra or by hearing the versatile application fields with many to any time science fiction like aspects getting realised the other day; they were always fascinating. Getting familiar with some blue lasers happened in Freiburg. At that time an extremely expensive black box. One should be extremely careful with this tiny treasure, they said. Well, happening to cost that much, they should have been behaved as a VIP. This mixture of fear and respect remained till I got the first blue laser specimens for test. And the wide necessary knowledge behind this minute structure is still fascinating. The information technology booms and information needs some storage more compact. And this at the first glimpse irrelevant issue is the most powerful driving engine of the blue laser research branch. The key word is Blu-ray Disc. Is it possible to have any laser TVs? What would be then the colour system? Possibly an RGB. Well, a Red, a Green and a Blue laser would be then needed. Green is actually the colour by which the human eyes’ are sensitive at most. But making some marketable green laser devices is still challenging. The future will show us the improvements in making the green laser diodes. The epitaxy group of the solid state institute of Bremen university deals with growth, processing and characterisation of III-V based as well II-V based laser diodes. This wide terms of reference requires many people working in different subgroups having clear defined tasks and cooperating with each other. I was mainly responsible for the opto-electrical characterisation of the devices of both III-V and II-VI groups. This provided me the chance to cooperate with practically every member of the group. The result of this very happy cooperation is the following. In the first chapter after taking a short look on the history of the semiconductor laser diodes, the basic physical concepts of these devices are delineated. The second chapter deals with the used growth methods and processing technology in Bremen. Since neither crystal growth nor technology belong to the main scope of this thesis, detailed information is not obtainable here. The third chapter belongs to the theoretical and practical prerequisites of understand- i

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