Third-order hyper-Rayleigh scattering in azobenzene dye solutions Toshiki Yamada and Shinro Mashiko Abstract We report the observation of third-order hyper-Ralyleigh scattering in azobenzene dye Disperse Red 1 solutions. The third-order polarizability (I.8 10-32 esu)of the dye under resonance conditions was determined from the measurements.