Abstract

The growth of a two-photon-resonant photoinduced second-harmonic signal at 660 nm in Er3+-dopect GeO2–Al2O3–SiO2 single-mode optical fibers pumped by a Nd:YAG laser at 1.319 μm is reported. Defect states in the band gap are optically excited through a resonant two-photon absorption process connecting the 4I15/24F9/2 energy levels of the erbium ions present in the fiber core. As a result a periodic χ(2)grating is formed, and efficient second-harmonic generation takes place. For erbium-free GeO2-doped silica test fibers no second-harmonic signal has been detected, even after hours of seeded preparation process.

© 1994 Optical Society of America

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