h1

%0 Thesis
%A Faidel, Heinrich
%T Montage nichtlinearer optischer Kristalle für den Einsatz in der Luft- und Raumfahrt
%I RWTH Aachen University
%V Dissertation
%C Aachen
%M RWTH-2015-01202
%@ 978-3-8440-3302-1
%B Berichte aus der Lasertechnik
%P 113 S. : Ill., graph. Darst.
%D 2015
%Z Prüfungsjahr: 2014. - Publikationsjahr: 2015. - Auch veröffentlicht auf dem Publikationsserver der RWTH Aachen University
%Z Zugl.: Aachen, Techn. Hochsch., Diss., 2014
%X By means of a space-based LIDAR-system (Light Detection and Ranging), a global analysis of gases in the atmosphere such as water vapor, methane or CO2 can be carried out. The understanding of the processes in the atmosphere can be improved by an extensive database. Thereby a revision and correction of the climate models and therefore a precise prediction would be enabled. Thermal and mechanical load requirements are particularly high during space operation. Thereby questions concerning reliability at operating times of at least three years without loss in pulse energy and beam quality are of special importance. Even though simple systems are already in orbit, an advancement of critical components in complex systems is required. The investigation of the mounting of optical components is carried out by means of a specially designed furnace. Thereby several strategies are considered. The offset strategy proves suitable for mounting tolerance-insensitive components. In combination with a local cooling the tolerances fall below the required 100 µrad. The joining of non-linear crystals using solder is hindered by different CTE’s along different crystal axes. The BBO-crystal is crack-sensitive due to its mechanical properties. For the joining, a suitable combination of material and structure can be found and the resulting combination can be demonstrated by an example of a functional Pockels cell. Thereby it is shown that the boundary conditions concerning electrical contacting and high voltage isolation are fulfilled simultaneously. Joining LBO-crystals is less critical than joining BBO-crystals due to the differences in mechanical properties.For an efficient frequency conversion, the temperature distribution within the LBO-crystal has to be homogeneous. For this reason the crystal is soldered planar. The conversion efficiency at 67
%F PUB:(DE-HGF)11 ; PUB:(DE-HGF)3
%9 Dissertation / PhD ThesisBook
%U https://publications.rwth-aachen.de/record/464308