# Conicity

Define a conicity as the deflection angle of the
gravity center of scalar beam, passing through CRE. It is calculated by

where and are the CRE Lambda-parameter and length.

Thus defined, the conicity could be associated with the apex semiangle
A of the hollow cone of a beam spreading within the
CRE. As predicted by Hamilton, in terms of eigenvalues of the dielectric tensor
the angle A is

There is not categorical experimental confirmation that the conicity
and the semiangle A are equal.

May 24, 2006

Author: T Kirilov