Sum-frequency generation with a free-electron laser: A study of gallium phosphide
- 1 July 1994
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 50 (1), R14-R17
- https://doi.org/10.1103/physreva.50.r14
Abstract
The use of a free-electron laser (FEL) allows the study of (non)linear optical properties of materials over unsurpassed large spectral intervals. Here we report on the application of a FEL as the IR source in spectroscopic infrared-visible sum-frequency generation (SFG). Using the extremely wide tunability and the high peak power of a FEL we have studied the frequency dependence of the nonlinear susceptibility for sum-frequency generation in gallium phosphide between 20 and 32 μm in great detail. It is shown that the SFG spectrum is heavily modified by linear optical effects.Keywords
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