Anisotropy analysis of third-harmonic generation in a germanium-doped silica optical fiber

We performed an intermodal third-harmonic generation around 516 nm in a germanium-doped silica optical fiber. The analysis of the complex polarization behavior that was observed allowed us to determine the orientation symmetry group of the fiber and the relative values of the independent coefficients of the third-order electric susceptibility tensor. (C) 2015 Optical Society of America