We report on a remarkably large second-harmonic generation (SHG) in a germanosilicate glass (15.7GeO2–84.3SiO2in mol &percent;), which was induced by poling while the sample was irradiated with the ArF laser at the wavelength of 193 nm. The SHG coefficient,d,thus induced was measured at various poling electric-field strengths using the Maker-fringe technique. The value ofdincreases with increasing poling field and then saturates around1.5×105V/cm. The largestdcoefficient value obtained in this work, which is 3.4±0.3 pm/V, seems to exceedd22ofLiNbO3.Furthermore, polarization dependence of the induced SHG shows an anisotropy of the refractive index. ©1997 American Institute of Physics.