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KLuS two one 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 skinny hexagonal plates. The low phonon energy (�?20 cm ⁻�?) was verified working with Raman spectroscopy. Samples were examined also through the use of optical absorption a