Abstract
We study the thermal stability of the second-harmonic signal in electron-beam poled silica based thin films developed for this application. Effects of N or Ge concentration as dopant, on one hand, and hydroxyl species, on the other hand, are tested. We conclude that water molecules inducing an ionic conductivity are detrimental to the e-beam poling efficiency and have to be avoided. Nevertheless, despite such precaution, the stability of the second-harmonic signal in an e-beam poled sample is worse than in a thermally poled sample.
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