@article{5676,
  author = {E. R. Eliel and E. W. M. van der Ham and Q. H. F. Vrehen and G. W. Thooft and M. Barmentlo and J. M. Auerhammer and A. F. G. van der Meer and P. W. van Amersfoort},
  title = {Studies of Interfacial Regions by Sum-Frequency Generation with a Free-Electron Laser},
  abstract = {The use of a Free-Electron Laser (FEL) allows the study of (non)linear optical properties of materials over unsurpassed large spectral intervals. As an example, we report on the use of a FEL as the infrared source in spectroscopic infrared-visible Sum-Frequency Generation (SFG). Employing the extremely wide tunability of the Free-Electron Laser for Infrared eXperiments (FELIX) at Rijnhuizen, we have studied the frequency dependence of the nonlinear susceptibility for sum-frequency generation in gallium phosphide between 20 and 32 mu m in great detail. We have developed a short-pulse visible laser system that is highly synchronous with FELIX thereby creating a two-color setup that can be broadly applied. Resonantly enhanced SFG in alpha-quartz has been used to study the relative timing stability of FELIX and the synchronized picosecond-laser system.},
  year = {1995},
  journal = {Applied Physics a-Materials Science & Processing},
  volume = {60},
  number = {2},
  pages = {113-119},
  month = {Feb},
  isbn = {0721-7250},
  doi = {10.1007/bf01538234},
  language = {eng},
}