Sum-frequency generation with a free-electron laser: A study of gallium phosphide

M. Barmentlo; G.W. ’t Hooft; E.R. Eliel; E.W.M. van der Ham; Q.H.F. Vrehen; A.F.G. van der Meer; P.W. van Amersfoort

doi:10.1103/PhysRevA.50.R14

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Sum-frequency generation with a free-electron laser: A study of gallium phosphide

M. Barmentlo, G.W. ’t Hooft, E.R. Eliel, E.W.M. van der Ham, Q.H.F. Vrehen, A.F.G. van der Meer, and P.W. van Amersfoort

Phys. Rev. A 50, R14(R) – Published 1 July 1994

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.

DOI:https://doi.org/10.1103/PhysRevA.50.R14