Abstract
Fixing experiments have been carried out in undoped α-phase proton-exchanged waveguides at room temperature and 110°C. Above room temperature, the recording kinetics of the diffraction efficiency exhibits a maximum and then decays to zero. Upon raising the temperature, decreases and the associated rise and decay times become progressively shorter. After fixing at 90°C and subsequent optical developing at room temperature, the developed value rises up to , showing a lifetime of a few hours in the dark and a few days under homogeneous illumination. Time constants for recording, dark decay, and developing have been measured as a function of temperature. Experimental dependences are reasonably simulated by using the standard model for fixing with the same parameters as with bulk , except the electron thermal ionization rate and the proton concentration, which are much greater in α-phase guides.
© 2005 Optical Society of America
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