An organic nonlinear optical material which possesses third order nonlinearity has been grown by slow solvent evaporation technique at room temperature. The structural, linear optical and nonlinear optical properties of 4-[(1E)-3-(4-chlorophenyl)-3-oxoprop-1-en-1-yl]phenyl-4-methyl-benzene-1-sulfonate (4CPMS) have been studied. The 1H-NMR study was used to characterize the structural properties. The 4CPMS crystal belongs to P1- space group with triclinic crystalline system. The linear optical absorption spectrum of 4CPMS exhibited wide transparency in the Visible / near IR region and photoluminescence spectra showed the blue light emission property. The Nd:YAG laser with 532 nm was used for analyzing nonlinear absorption coefficient and nonlinear refraction of 4CPMS material. This material exhibits reverse saturable absorption as a result of two photon absorption.