Line shapes of energy parameter modulated optical spectra and electrooptical signals in anisotropic crystals have been investigated. Density of states and complex dielectric functions in orthorhombic crystals are calculated in a tight binding approximation. Variations of the modulated spectra with changing crystal symmetry continuously from 1- of 2- to 3-dimension are examined. The results presented on a series of calculated spectra could be useful to understand the experimental results of modulation spectroscopy on real anisotropic crystals like layer-type and chain-like crystals.
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Okuyama et al. (1974) studied this question.