Abstract
We use an optical method based on sub-picosecond pulses moving in a nonlinear medium to generate relativistic dipoles that emit Cherenkov phonon–polariton radiation. Experiments on ZnTe and ZnSe reveal emission at subluminal speeds involving frequencies below those of the corresponding infrared-active phonon. The generation of Cherenkov radiation and impulsive stimulated Raman scattering by polaritons are the same physical phenomenon.
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