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Direct observation of the effective χ(2) grating in bulk glasses encoded for second-harmonic generation

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Abstract

The effective χ(2) grating responsible for second-harmonic generation in bulk glasses was spatially resolved with a charge-selective etching technique. We observed a spatially varying structure with a period equal to the coherence length of the material. The measured period of the grating showed excellent agreement with the expected value. In addition, cross-sectional etching patterns show that in this regime of encoding intensities the flux responsible for the intense electric field is not unidirectional as predicted by most models.

© 1996 Optical Society of America

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