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  • 2013 Conference on Lasers and Electro-Optics - International Quantum Electronics Conference
  • (Optica Publishing Group, 2013),
  • paper CJ_P_15

Annealing of pre-darkened ytterbium doped silica – Kinetic model

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Abstract

The photodarkening (PD) loss appears as time dependent broadband loss with peak at visible wavelengths and a long tail extending to near infrared wavelengths. The origin of PD is still under debate but in [1] it is proposed to be due to a “1½” bond color center (CC). The mechanism for CC absorption is by photon electric field excitation to the ionic three electron bond (TEB) of =Si<O2 Yb inducing forces in opposite directions to the TEB and Yb that finds resonance in σ- to σ*-bond excitation of the σ-bond in parallel to the TEB. Here the “1½” bond CC is for the first time shown to describe the annealing behavior of pre-darkened fibers [2-4].

© 2013 IEEE

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