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KLuS 2 single crystal samples undoped and doped that has a minimal (5 %) or substantial (38 %) concentration of trivalent thulium or ytterbium ions ended up synthesized in the shape of slender hexagonal plates. The reduced phonon Electrical power (�?20 cm ⁻�?) was confirmed making use of Raman spectroscopy. Samples ended up researched also th