Sodium niobium borophosphate glass, with a composition of 0.58(0.95NaPO₃+0.05Na₂B₄O₇)+0.42Nb₂O₅, has beendoped with monovalent silver ions. Second harmonic generation (SHG) hasbeen obtained from the poling treatment of this sample. Thesecond order nonlinearity from the anode side was estimated froman analysis of transmitted polarized Maker-fringe patterns. Thanks to theoriginal Maker fringe simulations, a value of 3 pm/V isobtained with the silver doped glass that unambiguously scales anenhancement of ~35% with respect to the nondoped glass susceptibility.For both glasses, the nonlinear layer is found to besodium-depleted up to 4  <i>µ</i>m inside the anode, in accordance withquantitative energy dispersive x-ray spectroscopy characterizations. This comparative study indicatescomplex space-charge-migration processes during the poling treatment. The relative enhancementof the SHG signal of the silver doped glass iscorrelated with the increase in its linear susceptibility.< Leer menos