Epitaxial layers of KY_(1_x_y)Gd_xLu_y(WO_4)_2 doped with Er~(3+) and Tm~(3+) for planar waveguide lasers

摘要

Here we show the results we obtained in the fabrication of planar waveguide lasers based on monoclinic double tungstates doped with Er~(3+) and Tm~(3+). We have successfully introduced these ions into the lattice matched KY_(0.59)Gd_(0.19)Lu_(0.22)(WO_4)_2 epitaxial layers grown on KY(WO_4)_2 substrates without loss of optical quality and keeping a high refractive index contrast between the epitaxial layer and the substrate. We characterized the waveguiding properties of these epitaxial layers at λ = 632.8 nm by dark modes spec-troscopy, and we showed that these waveguides can support several TE and TM modes. Spectroscopic characterization of the active lanthanide ions in these crystals is also presented.