A hyper-Rayleigh scattering (HRS) system based on an optical parametric power oscillator is described. The first hyperpolarizability, β, of Crystal Violet dye was measured at 1450 and 1500 nm. The resonance-free β value, β(0), for this octupole was found to be comparable with that of the dipolar dye Disperse Red 1 but with the nonlinearity—transparency trade-off worse for the octupole. The discrepancy in β(0) with that reported previously is explained in terms of resonance and the adequacy of the octupolar three-state model. The possibility of dye aggregation by solvent-dependent HRS is investigated.
© 1996 Optical Society of America
S. Stadler, R. Dietrich, G. Bourhill, and Ch. Bräuchle, "Long-wavelength first hyperpolarizability measurements by hyper-Rayleigh scattering," Opt. Lett. 21, 251-253 (1996)