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A technique is presented for measuring the "shear" photoelastic constants of lithium niobate by Bragg scattering from acoustic shear waves at moderate frequencies and at small Bragg angles. Values of p66=0.048, p14=0.056, p44=0.062, and p41=0.050 are obtained, the first two agreeing well with the results of other workers.
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Maloney et al. (1969) studied this question.
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