Optical decoherence times and spectral diffusion in an Er-doped optical fiber measured by two-pulse echoes, stimulated photon echoes, and spectral hole burning |
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Authors: | R.M. Macfarlane Y. Sun P.B. Sellin |
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Affiliation: | a Physics Department, Montana State University, Bozeman, MT 59717, USA b IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120, USA c Department of Physics, The University of South Dakota, Vermillion, SD 57069, USA |
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Abstract: | Two-pulse and stimulated photon echoes and spectral hole burning were measured on the transition from the lowest component of the 4I15/2 manifold to the lowest component of 4I13/2 of Er3+ in a silicate optical fiber at 1.6 K. The two-pulse echo decays gave decoherence times as long as 230 ns for magnetic fields above 2 T. A large field dependent contribution to the homogeneous line width of >2 MHz was found and interpreted in terms of coupling to magnetic tunneling modes (TLS) in the glass. The stimulated echoes measured at 2 T showed spectral diffusion of 0.8 MHz/decade of time between 0.4 and 500 μs. Spectral diffusion in this high field region is attributed to coupling to elastic TLS modes which have a distribution of flip rates in glasses. Time-resolved spectral hole burning at very low field showed stronger spectral diffusion of 5.7 MHz/decade of time, attributed to coupling to magnetic spin-elastic TLS modes. |
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Keywords: | 42.50.Md 71.55.Jv |
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