LITTLE KNOWN FACTS ABOUT BIREFRINGENT CRYSTAL.

各向异性透明晶体如方解石、石英等的折射率，是其固有的特性，称为永久双折射。For optical fibers together with other waveguides, it is more correct to consider the main difference of helpful refractive indices. This is often immediately linked to the difference in imaginary values of the propagation constants.If wav