Role of a localized modulation of χ⁽²⁾ in Čerenkov second-harmonic generation in nonlinear bulk medium
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 analytical...[Show more]
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