A novel class of new organic NLO hexamine: m – cresol material

摘要: The design and search for non–linear optical (NLO) materials has been a matter of interest in recent years because of their potential applications to laser devices, telecommunications and optical data storage [1]. Second harmonic generation (SHG), the second–order effect of NLO properties of crystalline materials depend both on the magnitude of the molecular hyperpolarizability (β)(microscopic non–linearity) and on the orientation of the molecules in the crystal lattice [2]. Organic molecules, in general are potentially more attractive and versatile than inorganic compounds for NLO materials because of their large β–values, fast response time, high resistance to optical damage threshold and the almost unlimited possibilities of designing molecules suitable for SHG [3]. Nevertheless, the transfer of these materials into actual devices is not simple because of some of the demanding requirements such as non–centro symmetric packing of NLO chromophores, low optical losses either absorption or scattering and environmental and photochemical stabilities. The NLO chromophores need to be packed with an ideal orientation in the crystals for even to achieve non–centro symmetry with phase matching conditions [4–7].