Abstract
A pump-induced nonlinear refractive-index change in erbium-doped and ytterbium-doped fibers has been measured at by time-delayed photorefractive beam coupling in a copropagating and counterpropagating geometry. It was found that decreases at the wavelength of the probe beam when the pump beam is present. We present a semiclassical theory based on a four-state system that accounts for the pump-induced change of . Both theoretical and experimental results show that a significant index change, of the order of 10%, can be obtained for cw pump powers as small as .
© 2005 Optical Society of America
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