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We report a method based on Malus' law to directly measure the dielectric frame orientation of monoclinic crystals with an accuracy of 0.3°. This technique was validated by the study of Nd3+:YCa4O(BO3)3, Sn2P2S6, BiB3O6 and Eu3+:Y2SiO5
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Traum et al. (2013) studied this question.
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