Difference of Natural Waves Determined in the Modern and Previous Theories of Natural Gyrotropy of Crystals

摘要

On the basis of exact numerical calculations, the difference of parameters of natural waves determined in the contemporary and previous theories of gyrotropy is determined. It is found that the differences correspond to the limit and, for the majority of commonly used crystals, are beyond the limits of the practically accessible accuracy of the measurement of natural-wave parameters. Because of this, experimenters are recommended to study gyrotropic crystals as before, using the previous theory of gyrotropy. The modern theory of gyrotropy, as a manifestation of spatial dispersion, should be used only in exceptional cases, for instance, in the search for the third, i.e., excitonic, natural wave.