Role of a localized modulation of χ(2) in Čerenkov second-harmonic generation in nonlinear bulk medium.

@article{Sheng2012RoleOA,
  title={Role of a localized modulation of χ(2) in {\vC}erenkov second-harmonic generation in nonlinear bulk medium.},
  author={Yan Sheng and Vito Roppo and Ksawery Kalinowski and Wieslaw Z. Krolikowski},
  journal={Optics letters},
  year={2012},
  volume={37 18},
  pages={3864-6}
}
We study the second-harmonic generation in quadratic nonlinear media with localized spatial modulation of χ((2)) response. We demonstrate that the emission of Čerenkov second-harmonic takes place only when the fundamental beam illuminates the region of χ((2)) variation. This proves that the sharp modulation of the χ((2)) nonlinearity constitutes a sufficient condition for the emission of Čerenkov second harmonic in bulk materials. Our calculations are in excellent agreement with simple… CONTINUE READING

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