@PhdThesis{dbt_mods_00001596,
  author = 	{Hecht-Mijic Dr.-Ing., Stephan},
  title = 	{Brechzahl{\"a}nderung durch Ionenaustausch in strukturierten Glasbauteilen},
  year = 	{2004},
  month = 	{Mar},
  day = 	{16},
  keywords = 	{Glas; Ionenaustausch; Brechzahl; Lichtwellenleiter; Herstellung},
  abstract = 	{Change of refractive index by ion exchange in structured glass parts


Abstract

The materialscientific fundamentals of refactive index change based on ion 
exchange in a structurable glass (FS21) were established. Decreasing the 
refractive index was favoured and investigated in detail. The production of 
small light guiding glass parts with complex geometry is possible by two 
technologies following one after the other: first fotostructuring and second 
refractive index change by ion exchange. Coming from the fundamentals 
investigated in this work new applications in microsystems technology can be 
found, for example grippers and springs with an integrated sensor function that 
is based on light guidance. 
For the ion exchange a salt melt of 100 {\%} NaNO3 is used. Low cost equipment was 
developed and process parameters were defined in order to guarantee 
reproduceability of the results of the ion exchange.
Extensive studies were made on the diffusion profiles made by ion exchange and 
their dependence on ion exchange parameters. Experimentally found correlations 
between diffusion coefficients and profile depths on the one hand and ion 
exchange temperature and time on the other show behaviour as may be expected 
from theory.
Compressive stress resulting from the ion exchange was proven and measured.
The change in refractive index was calculated from the diffusion profiles, e.g. 
profiles of chemical composition. The comparison with measured profiles of 
refractive index allowed an interpretation of the mechanism of the refractive 
index decrease. The production of refractive index profiles was also 
investigated depending on ion exchange temperature and time. These results were 
in agreement with those from the diffusion profiles. 
Simple light guide parts were produced and the parameters light guidance 
diameter, ion exchange temperature and time were varied. The light intensity at 
the exit of such light guide parts was characterized and maxima were found. U-
shaped parts and light splitter parts were investigated in principle.
This work can be the starting point for applications research and for glass 
basic research and contains corresponding proposals.},
  url = 	{https://www.db-thueringen.de/receive/dbt_mods_00001596},
  url = 	{http://uri.gbv.de/document/gvk:ppn:381860310},
  file = 	{:https://www.db-thueringen.de/servlets/MCRZipServlet/dbt_derivate_00002526:TYPE},
  language = 	{de}
}