Abstract
Resonances on the transverse polariton and longitudinal exciton branches of CuCl are studied under unixial stress by nonlinear optical spectroscopy. Stress-induced shifts and splittings of resonances are clearly resolved for uniaxial stress up to 1.6 kbar. Due to the small linewidth the deformation potentials are determined with higher accuracy than with the classical methods of reflection or absorption spectroscopy.
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