Abstract
Concentration dependence of nonlinear refractive index in fibers heavily doped with is studied by using the D-scan method. Good agreement with an empirical dependence established earlier with lower concentrations by the cw dual-frequency beat signal technique is shown for concentrations up to . The highest values of the nonlinear coefficient γ at of 47.9, 57.7, and were obtained in fibers doped with 67, 75, and , respectively.
© 2007 Optical Society of America
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