Birefringence in ZnP2-D4

Abstract

Spatial dispersion in ZnP2-D48 has been studied. The spectral dependences of the refractive index nс (Е||с, k||a), nа (Е||а, k||с) and nb (E||b, k||c) had been determined. ZnP2-D4 8 crystals are isotropic at λо=612nm wavelength, in case of crossed polarizators a transmittance maximum is observed. It was shown that the dispersion is positive nc(Е||с,k||a), nа (Е||а,k||с) > nb(E||b,k||c) in λ>λ0 region, the dispersion is negative nс (Е||с,k||a) at λ<λ0, and n=nс –nb =0 at λ=λ0.