Nonlinear optical properties of some m-disubstituted benzene derivatives

Abstract

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.