@article{KazasidisWittrock2014,
  author    = {Kazasidis, Orestis and Wittrock, Ulrich},
  title     = {Interferometric measurement of the temperature coefficient of the refractive index dn/dT and the coefficient of thermal expansion of Pr:YLF laser crystals},
  series = {Opt. Expr.},
  volume    = {22},
  journal   = {Opt. Expr.},
  publisher = {Optical Society of America},
  doi       = {10.25974/fhms-772},
  url       = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-7720},
  pages     = {30683 -- 30696},
  year      = {2014},
  abstract  = {We report interferometric measurements of the temperature coefficient of the refractive index (dn=dT) and the coefficient of thermal expansion (a) of a praseodymium-doped yttrium lithium fluoride (Pr:YLF) crystal and of a fused silica reference sample. Our phase-resolved interferometric method yields a large number of data points and thus allows a precise measurement and a good error estimation. Furthermore, both dn=dT and a are obtained simultaneously from a single measurement which reduces errors that can occur in separate measurements. Over the temperature range from 20 °C to 80 °C, the value of dn=dT of Pr:YLF decreases from -5.2 x 10-6 /K to -6.2 x 10-6 /K for the ordinary refractive index and from -7.6 x 10-6 /K to -8.6 x 10-6 /K for the extraordinary refractive index. The coefficient of thermal expansion for the a-axis of Pr:YLF increases from 16.4 x 10-6 /K to 17.8 x 10-6 /K over the same temperature range.},
  language  = {en}
}