Growth, structural, optical, spectral and thermal characterization of third order nonlinear optical crystal: Diammonium fumarate

Single crystals of diammonium fumarate were grown from aqueous solution by slow evaporation method. The lattice parameters and the crystal system are estimated from single crystal X-ray diffraction analysis. The transmission range of the crystal was revealed from UV-Vis-NIR analysis. The vibrational modes of different molecular groups present in the crystal was identified from IR and Raman spectroscopy. The NMR analysis confirms the molecular structure of the grown crystal. The thermal properties were analyzed from TG/DTA thermograms. The nonlinear refractive index and third order nonlinear optical susceptibility were determined from Z-scan technique.