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 4F9/2 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
Original Manuscript: May 12, 1993
Published: October 15, 1993
T. H. Hoekstra, B. J. Offrein, P. V. Lambeck, and Th. J. A. Popma, "Nonlinear refractive index of erbium-doped Y2O3 integrated-optical waveguides," Opt. Lett. 18, 1718-1720 (1993)