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KLuS 2 one crystal samples undoped and doped using a reduced (5 %) or large (38 %) concentration of trivalent thulium or ytterbium ions had been synthesized in the shape of slim hexagonal plates. The small phonon energy (�?20 cm ⁻�?) was confirmed applying Raman spectroscopy. Samples had been examined also through the use of optical absorptio