Abstract

We theoretically investigate non-refracted extraordinary rays where the ray does not change its direction when transmitted from a vacuum into a uniaxial crystal, even at oblique incidence. This is possible only when the optic axis is in the plane of incidence. We find that within the usual birefringence range of $\sqrt{n_o}\le n_e\le n_o^2$, for a given angle of cut, there exits only one angle of incidence that produces a non-refracted extraordinary ray. Beyond this range, the number of solutions may be up to three. Numerical examples are given. All cases can be solved algebraically from a quartic equation.

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