Mapping the nonlinear optical susceptibility by noncollinear second harmonic generation

Details Mapping the nonlinear optical susceptibility by noncollinear second harmonic generation Mapping the nonlinear optical susceptibility by noncollinear second harmonic generation

2009-06-08

arxiv.org/abs/0906.1478v1

Physics

Optics

To appear on Opt. Lett

Scientific paper

We present a method, based on noncollinear second harmonic generation, to evaluate the non-zero elements of the nonlinear optical susceptibility. At a fixed incidence angle, the generated signal is investigated by varying the polarization state of both fundamental beams. The resulting polarization charts allows to verify if Kleinman symmetry rules can be applied to a given material or to retrieve the absolute value of the nonlinear optical tensor terms, from a reference measurement. Experimental measurements obtained from Gallium Nitride layers are reported. The proposed method does not require an angular scan thus is useful when the generated signal is strongly affected by sample rotation

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