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VOLUME 28 (1978) | ISSUE 3 | PAGE 153
Generation of the optical second harmonic in noncommensurate phases of crystals
Experimental investigations of the generation of the second harmonic have revealed an asymmetry in the nonlinear-susceptibility tensor of the noncommensurate phase of the (NH4)2BeF4 crystal. This effect is attributed to spatial modulation along the a axis.