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KLuS 2 solitary crystal samples undoped and doped that has a very low (5 %) or large (38 %) focus of trivalent thulium or ytterbium ions have been synthesized in the form of thin hexagonal plates. The low phonon Electrical power (�?20 cm ⁻�?) was confirmed using Raman spectroscopy. Samples were studied also by making use of optical absorption