Pump-induced nonlinear refractive-index change in erbium- and ytterbium-doped fibers: theory and experiment
Optics Letters, Vol. 30, Issue 11, pp. 1261-1263 (2005)
http://dx.doi.org/10.1364/OL.30.001261
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Abstract
A 980-nm pump-induced nonlinear refractive-index (n_2) change in erbium-doped (20-m) and ytterbium-doped (20-m) fibers has been measured at 1064 nm by time-delayed photorefractive beam coupling in a copropagating and counterpropagating geometry. It was found that n_2 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 n_2. 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 as10 mW.
© 2005 Optical Society of America
OCIS Codes
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(060.2330) Fiber optics and optical communications : Fiber optics communications
(190.4370) Nonlinear optics : Nonlinear optics, fibers
Citation
Hernando Garcia, Anthony M. Johnson, Ferdinand A. Oguama, and Sudhir Trivedi, "Pump-induced nonlinear refractive-index change in erbium- and ytterbium-doped fibers: theory and experiment," Opt. Lett. 30, 1261-1263 (2005)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-30-11-1261
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