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Opt Lett. 2007 Mar 1;32(5):488-90.

Lu, Gd codoped KY(WO(4))(2):Yb epitaxial layers: towards integrated optics based on KY(WO(4))(2).

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  • 1Advanced Photonics Laboratory, Institute of Imaging and Applied Optics, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.


Codoping KY(WO(4))(2):Yb layers with optically inert Lu and Gd ions allows a large increase of the refractive index contrast with respect to KY(WO(4))(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 1 dB/cm have been evaluated. A Y-junction with a splitting ratio close to 1:1 and additional losses of 1.4 dB has also been demonstrated.

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