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KLuS 2 one crystal samples undoped and doped by using a low (five %) or substantial (38 %) concentration of trivalent thulium or ytterbium ions had been synthesized in the form of slim hexagonal plates. The minimal phonon Vitality (�?20 cm ⁻�?) was confirmed applying Raman spectroscopy. Samples were analyzed also by making use of optical abso