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KLuS 2 one crystal samples undoped and doped by using a very low (5 %) or superior (38 %) focus of trivalent thulium or ytterbium ions have been synthesized in the shape of thin hexagonal plates. The minimal phonon Vitality (�?20 cm ⁻�?) was verified making use of Raman spectroscopy. Samples were being examined also by making use of optical a