摘要： A novel chalcone derivative (E)-3-(4-fluorophenyl)-1-(4-methoxyphenyl)prop-2-en-1-one abbreviated as FMC was synthesized using Claisen-Schmidt condensation reaction method. Single crystals were grown using slow evaporation solution growth technique. The UV-Visible spectrum reveals that crystals are transparent in the visible region. The third order NLO properties of grown crystals in DMF (0.01m) have been studied using single beam z-scan technique with continuous wave DPSS laser operating at 532nm wavelength and 200mW power. The calculated values of non linear R.I, non linear absorption coefficient and magnitude of 3rd order susceptibility are of the order -0.1466×10-8 cm2W-1, 4.5×10-5cmW-1 and 1.26×10-8e.s.u respectively. The hyperpolarizability value obtained is of the order 1.044×10-27e.s.u. The crystal shows optical limiting behavior with limiting threshold of 11.2 KJcm-2. The results suggest that this material is considered as a promising candidate for future nonlinear optical device applications for continuous wave laser excitation.