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Lu, Gd codoped K Y ( W O 4 ) 2 : Yb epitaxial layers: towards integrated optics based on K Y ( W O 4 ) 2

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Abstract

Codoping KY(WO4)2:Yb layers with optically inert Lu and Gd ions allows a large increase of the refractive index contrast with respect to KY(WO4)2 substrates. This paves the way for the realization of integrated optical circuits based on this very promising material. First riblike waveguide structures have been fabricated and propagation losses below 1dBcm have been evaluated. A Y-junction with a splitting ratio close to 1:1 and additional losses of 1.4dB has also been demonstrated.

© 2007 Optical Society of America

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