Optical temperature sensing properties of Yb3+/Tm3+ co-doped NaLuF4 crystals

The optical temperature sensing properties of Tm3+ were systematically investigated, and NaLuF4: Yb3+/Er3+ crystals were adopted as a thermal probe to monitor the laser-induced thermal effect and to verify the accuracy of the temperature detection for Tm3+ in NaLuF4: Yb3+/Tm3+ crystals.196