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Thermal poling of silica glass modified by femtosecond laser irradiation is demonstrated. Increase of second-harmonic generation in the irradiated regions is observed. This enhancement is interpreted in terms of structural modifications in silica glass that make the poling process more efficient. Evidence of a change in the distribution of the electrostatic field frozen in glass during poling is obtained. This technique is used for (2) grating fabrication.© 2002 American Institute of Physics. DOI: 10.1063/1.1504181

Thermally poled silica glass is an attractive material for applications in nonlinear optics. Silica glass is widely used in optoelectronics because of its excellent optical properties, and thermal poling offers a simple and reproducible way to induce permanent second-order nonlinearity in glasses. 1 The poling process relies on the creation of a large electrostatic field (Edc) inside the glass when heated (300 C) with a …