Determination of the third-order nonlinear optical coefficients of germanium through ellipse rotation.

@article{Watkins1980DeterminationOT,
  title={Determination of the third-order nonlinear optical coefficients of germanium through ellipse rotation.},
  author={D. E. P. Watkins and C R Phipps and Simon James Thomas},
  journal={Optics letters},
  year={1980},
  volume={5 6},
  pages={248-9}
}
We describe the first reported direct determination of the 10 -Am nonlinear susceptibility in intrinsic Ge through time-resolved ellipse rotation. We found that X(3)(1111). = 2.5 X 10(-11) esu and X(3)(1221)= 1.3 X 10(-11) esu, significantly below previous estimates.