Two techniques are described for measurement of the indices of refraction of novel optical crystals. First a modification is presented of the traditional measurement of the angle of minimum deviation of a refracted beam and applied to lead tetraborate (PTB). The second method applies polarized Michelson interferometry to the principal refractive indices of RbNbB(2)O(6) (RNB). Both PTB and RNB are nonlinear optical crystals that have been recently synthesized and grown for the first time.
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Nicholls et al. (1997) studied this question.