THE BASIC PRINCIPLES OF 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。If the electrical area has the way on the optical axis, one obtains the remarkable index ne. This is feasible provided that the propagation way (far more specifically, the path with the k vector) is perpendicular to the optical axis. For a