Abstract

Quasi phase matching was induced within a few minutes by optical means in a thermally poled glass sample. The spatial modulation of χ2 that was induced by two-photon absorption of the sample subjected to an intense sinusoidal pump intensity pattern resulted in a χ2 grating. The second-harmonic generation produced by a probe beam was diffracted in specific directions by this χ2 grating, thus providing a way to monitor its inscription inside the glass. This χ2 grating is extremely stable at room temperature and in ambient laboratory conditions. During the process of inscription, a linear index grating was also induced. It was not stable, and it relaxed rapidly.

© 2001 Optical Society of America

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