Abstract
We investigate experimentally and theoretically the conical emission of Čerenkov-type third-harmonic generation in strontium barium niobate of random 2D-χ(2) distribution. The azimuthal intensity distribution is explained by the polarization properties of the fundamental and Čerenkov second-harmonic waves, depending on the cascaded origin of the generation process. Moreover, we show the role of the individual domain shape in an additional modulation on the conical emission, controlled by the electrical switching of the spontaneous polarization of the ferroelectric medium.
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