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High-quality epitaxial layers of heavily doped Yb:KLuðWO 4 Þ 2 grown on KLuðWO 4 Þ 2 substrates by liquid phase epitaxy were characterized in terms of lattice mismatch and refractive indexes of the layer and the substrate. The effective refractive indexes of the guided modes that these structures can support were modeled and measured experimentally for the transverse electric (TE) and transverse magnetic (TM) mode excitation by dark m-lines spectroscopy. The upper limit for optical losses indoi:10.1109/jphot.2010.2050580 fatcat:dicepl4fgfgwdewci3elhtdkem