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This study extends our previous work that describes the sol-gel preparation of Er3+/Yb3+:LiNbO3 waveguiding films. Here we describe the influence of the starting PVP/2-methoxyethanol solutions ageing on the properties of films deposited by spin-coating. We tested solutions prepared from PVP of two molecular masses (29,000 g/mol and 360,000 g/mol) aged for up to 10 months. To establish the Er3+/Yb3+...
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