1. Bjurshagen, S., Hellström, J.E., Pasiskevicius, V., Pujol, M.C., Aguiló, M., Díaz, F.: Fluorescence dynamics and rate equation analysis in $$\text{ Er}^{3+}$$ and $$\text{ Yb}^{3+}$$ doped double tungstates. Appl. Opt. 45, 4715–4725 (2006)
2. Bolaños, W., Carvajal, J.J., Mateos, X., Murugan, G.S., Subramanian, A.Z., Wilkinson, J.S., Cantelar, E., Jaque, D., Lifante, G., Aguiló, M., Díaz, F.: Mirrorless buried waveguide laser in monoclinic double tungstates fabricated by a novel combination of ion milling and liquid phase epitaxy. Opt. Exp. 18, 26937–26945 (2010)
3. Bolaños, W., Carvajal, J.J., Pujol, M.C., Mateos, X., Lifante, G., Murugan, G.S., Wilkinson, J.S., Aguiló, M., Díaz, F.: Monoclinic double tungstate lattice matched epitaxial layers for integrated optics applications. Phys. Procedia 8, 151–156 (2010)
4. Bolaños, W., Carvajal, J.J., Mateos, X., Murugan, G.S., Subramanian, A.Z., Wilkinson, J.S., Cantelar, E., Lifante, G., Aguiló, M., Díaz, F.: Analysis of confinement effects on microstructured Ln $$^{3+}$$ :KY $$_{1-x-y}$$ Gd $$_x$$ Lu $$_{y} (\text{ WO}_{4})_{2}$$ waveguides. Opt. Mater. 34, 315–475 (2011)
5. Cantelar, E., Muñoz, J.A., Sanz-García, J.A., Cussó, F.: Phys. J.: $$\text{ Yb}^{3+}$$ to $$\text{ Er}^{3+}$$ energy transfer in LiNbO 3. Condens. Matter 10, 8893–8903 (1998)