Abstract
Using two-photon excitation spectroscopy and three-photon difference frequency generation, resonances on the transverse and longitudinal polariton branches of the $A({\ensuremath{\Gamma}}_{5}),$ $B({\ensuremath{\Gamma}}_{5}),$ and $C({\ensuremath{\Gamma}}_{1})$ $1S$ excitons of ZnO are studied under uniaxial stress. Due to the small linewidth, shifts and splittings are clearly resolved and six deformation potentials are determined with high accuracy.
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