Second harmonic generation of microcrystalline of acridine derivatives

A second harmonic generation (SHG) measurement system for organic powders have been built. Then the second-order nonlinear optical properties of acridine derivatives have been measured with this experimental setup and compared with the calculated value. The intensity of SHG of acridine derivate microcrystal is related to its structure and molecular refractive index. Acridines with two-dimension dipole Λ type structure, intermolecular hydrogen bond, long chain alkyl with branches and methyl group possess high nonlinear optical properties. The relative SHG of these microcrystallines are proportional to their hypersusceptibilities, but not conform to the Kurtz-Perry relation.