Abstract

Self-induced phase modulation in erbium-doped polycrystalline Y₂O₃ integrated-optic waveguides is studied by use of a Mach–Zehnder interferometric setup. We determined the wavelength dispersion of the nonlinear refractive index near the ⁴F_9/2 absorption band and show that it corresponds qualitatively with a Kramers–Krönig analysis. The nonlinear coefficient at 670 nm was determined to be 1.4 × 10⁻¹⁴ m²/W and has an electronic origin with a slow relaxation time of 6 ms.

© 1993 Optical Society of America

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