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KLuS 2 solitary crystal samples undoped and doped with a low (5 %) or significant (38 %) concentration of trivalent thulium or ytterbium ions were being synthesized in the shape of slender hexagonal plates. The very low phonon Vitality (�?20 cm ⁻�?) was confirmed utilizing Raman spectroscopy. Samples were examined also through the use of opti