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Optical linear and nonlinear properties of single crystals of m-aminophenol, m-nitroaniline, m-chloronitrobenzene, and m-bromonitrobenzene have been studied. The second order optical susceptibilities have been measured with a Nd–YAG laser using a generalization of the Maker fringes technique to the case of biaxial crystals; their relative signs have been determined. The calculated phase matching conditions have been experimentally confirmed. m-Chloronitrobenzene, m-bromonitrobenzene alloys have a high figure of merit and are noncritically phase matchable from 0.974 to 1.069 μm as a function of concentration. The validity of an additivity approach to account for crystal nonlinearities is verified. The vector portion of the nonlinear susceptibility is related to the crystalline spontaneous polarization.
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Carenco et al. (1977) studied this question.
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