2ND-HARMONIC GENERATION IN UV-POLED GLASS

A remarkably large second-harmonic generation (SHG) in a germanosilica te glass (15.7 GeO2-84.3 SiO2 in mol.%), which was induced by poling w ith ArF laser irradiation at the wavelength of 193 nm is reported Usin g the Maker-Fringe technique, the induced SHG coefficient, d, was meas ured at various poling electric-field strengths. The measured d coeffi cient value increases with increasing poling field and then saturates around 1.5x10(5) V/cm. The largest d coefficient value obtained in thi s experiment, which is 3.4+/-0.3 pm/V, seems to exceed d(22) of LiNbO3 . Furthermore, polarization dependence of the induced SHG indicates an anisotropy of the refractive index.