Advancements in VCSEL technology [Elektronische Ressource] : transverse mode control and matrix-addressable 2-D arrays / by Abdelsattar Mohamed Abdelsattar Gadallah

Advancements in VCSEL Technology:Transverse Mode Control andMatrix-Addressable 2-D ArraysDISSERTATIONto obtain the academic degree ofDOKTOR-INGENIEUR(DR.-ING.)from the Faculty of Engineering and Computer Sciencesof Ulm UniversitybyABDELSATTAR MOHAMED ABDELSATTARGADALLAHFROM FAYOUM, EGYPTst1 Referee: PD Dr.-Ing. Rainer Michalziknd2 Prof. Dr. Raimund HibstDean of the Faculty: Prof. Dr.-Ing. Michael WeberOral Examination: Ulm, February 18, 2010To my wife and my children Mohamed and AhmedAcknowledgmentForemost,IwouldliketoexpressmysinceregratitudetoPriv.-Doz. Dr.-Ing.RainerMichalzik,the head of VCSELs and optical interconnects group, who gave me the opportunity to per-form this work under his supervision. He was a constant source of support for me duringmy thesis, for which I will be forever grateful. Without his collaboration, this work wouldnot have been possible. He provided me with the thesis ideas of multi-spot shallow surface-relief rectangular-shaped VCSELs and densely-packed two dimensional matrix-addressableVCSEL arrays. I am indebted to him for all the support and knowledge he has given to me.I wish to thank all people that I have worked with during this thesis. I would like tothank some of them explicitly: Dipl.-Ing. Andrea Kroner for scientiflc help and discussionsduring the design of the flrst mask and the processing of the flrst sample. I am very gratefulto Dipl.-Ing.