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Correlation between second-order optical response and structure in thermally poled sodium niobium-germanate glass

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4 Author(s)
Guimbretiere, G. ; Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, 116 35 Athens, Greece ; Dussauze, M. ; Rodriguez, V. ; Kamitsos, E.I.

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We have carried out Raman and second harmonic generation (SHG) measurements to probe thermal poling-induced phenomena in glass 20Na2O-80[0.35Nb2O5-0.65GeO2]. A SHG response of 0.6 pm/V was measured after poling in a ∼3 μm thick layer under the anode and found to deviate from the widely used electric field-induced SHG model. This effect was associated with complex structural rearrangements in the subanode layer involving destruction of nonbridging oxygen atoms, formation of molecular oxygen, and enhancement of cross-linking in the glass network.

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Applied Physics Letters  (Volume:97 ,  Issue: 17 )