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An attempt to measure the fourth-order electrooptic effect in KH2PO4(KDP) and NH4H2PO4(ADP) is presented. Contrary to previously reported results of the order of magnitude 10-30m4V-4, the fourth-order coefficient |g111111- g221111| is found to be lower than 5 · 10-33m4V-4and 1 · 10-34m4V-4, respectively. In addition, the effect of imperfect crystal cutting and alignment is investigated by means of...
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