Studies of interfacial regions by sum-frequency generation with a free-electron laser |
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| Authors: | E R Eliel E W M van der Ham Q H F Vrehen G W 't Hooft M Barmentlo J M Auerhammer A F G van der Meer P W van Amersfoort |
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| Institution: | (1) Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA, Leiden, The Netherlands;(2) Philips Research Laboratories, Prof. Holstlaan 4, 5656AA Eindhoven, The Netherlands;(3) FOM-Institute for Plasma Physics  Rijnhuizen , P.O. Box 1207, 3430 BE Nieuwegein, The Netherlands |
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| 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 sumfrequency generation in gallium phosphide between 20 and 32  m in great detail. We have developed a shortpulse visible laser system that is highly synchronous with FELIX thereby creating a two-color setup that can be broadly applied. Resonantly enhanced SFG in alphaquartz has been used to study the relative timing stability of FELIX and the synchronized picosecond-laser system.Paper presented at the 129th WE-Hearaeus-Seminar on  Surface studies by Nonlinear Laser Spectroscopies , Kassel, Germany, May 30 to June 1, 1994 |
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| Keywords: | 41 60 Cr 42 60 By 42 65 Ky |
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