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Acknowledgements<br />

Everything began in winter 1998 when I attended a lecture on EUV- and X-ray<br />

optics by Prof. Ulrich Heinzmann and PD Dr. Markus Drescher. They offered<br />

me the opportunity to take part in a practical training on synchrotron radiation<br />

at BESSY I in spring 1999. At this time I first met most of the members of<br />

the group that I just knew from the lecture and I really enjoyed the night shifts<br />

with PD Dr. Markus Drescher and <strong>for</strong>mer members of the group Dr. Bernd<br />

Schmidtke and Dr. Tarek Khalil.<br />

In october 2000 PD Dr. Markus Drescher invited me to the Institute of Photonics<br />

at the TU-Wien <strong>for</strong> a practical training participating in a project in collaboration<br />

with Prof. Ferenc Krausz and asked me if I would be interested to join his<br />

working group and do my diploma thesis at the EUV-<strong>laser</strong> source in Bielefeld investigating<br />

and improving the process of <strong>High</strong> <strong>Harmonic</strong> Generation after I have<br />

finished my other examinations.<br />

He offered me some topics he has been thinking of and the utilization of <strong>Adaptive</strong><br />

Optics appeared the most interesting and at last the most difficult one to me and<br />

has been a challenge I wanted to master. I really do not know whether he could<br />

believe in the success of these concepts at that time and I am really grateful that<br />

he gave me the opportunity to work on such a complex diploma thesis and gave<br />

me any kind of freedom working on that topic. Finally his enthusiasm on the<br />

”marriage” of the principles of <strong>Adaptive</strong> Optics and <strong>High</strong> <strong>Harmonic</strong> Generation<br />

has been infecting!<br />

IoweProf. Heinzmann and him gratitude <strong>for</strong> the opportunities they gave me<br />

during my studies in Bielefeld beyond working on my diploma thesis. Especially<br />

the possibility to take part in research at BESSY II several times and gain experiences<br />

in synchrotron radiation, ultra high vacuum physics and spin polarization.<br />

I really enjoyed the times at BESSY II with PD Dr. Markus Drescher and all<br />

other colleges I have met there and hopefully they did as well.<br />

i

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