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KLuS two one crystal samples undoped and doped with a very low (5 %) or superior (38 %) focus of trivalent thulium or ytterbium ions ended up synthesized in the form of slender hexagonal plates. The reduced phonon energy (�?20 cm ⁻�?) was verified working with Raman spectroscopy. Samples were being studied also by making use of optical absorp