Author/Authors :
Flipse، نويسنده , , Marinus C. and de Jonge، نويسنده , , Roel and Woudenberg، نويسنده , , Richard H. and Marsman، نويسنده , , Albert W. and van Walree، نويسنده , , Cornelis A. and Jenneskens، نويسنده , , Leonardus W. Jenneskens، نويسنده ,
Abstract :
A comparison of first hyperpolarizabilities β determined by hyper-Rayleigh scattering (HRS; βHRS) and electric field-induced second-harmonic generation (EFISH; βEFISH) for a series of donor-acceptor substitutetd π-conjugated organic compounds shows a marked discrepancy between βHRS and βEFISH values for NLO-chromophores which fluoresce in the frequency-doubled wavelength region (532 nm). For MONS and DANS it is unequivocally established that two-photon absorption (TPA) at the fundamental wavelength (1064 nm) occurs followed by Stokes and anti-Stokes fluorescence around the second-harmonic wavelength. Hence, hyper-Rayleigh scattering at 1064 nm is not suited to determining the β of these fluorescent NLO-chromophores.
