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The degenerate four-wave mixing spectroscopy of uniaxially strained GaNlayers is demonstrated using colinearly polarized laser pulses. The nonlinearresponse of FWM signal on exciton oscillator strength enhances the sensitivityfor polarized exciton, allowing for mapping out the in-plane anisotropy of thestrain field. The observed high-contrast spectral polarization clearly showsfine structure splittings of excitons, which are also confirmed in the changeof quantum beating periods of time.Comment: 4 pages, 7 figures. Submitted to Physical Review

Optical diffraction spectroscopy of excitons in uniaxially strained GaN films