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KLuS 2 one crystal samples undoped and doped with a low (five %) or higher (38 %) focus of trivalent thulium or ytterbium ions ended up synthesized in the shape of skinny hexagonal plates. The reduced phonon Vitality (�?20 cm ⁻�?) was confirmed employing Raman spectroscopy. Samples were being examined also by utilizing optical absorption and