Up-conversion luminescence polarization control in Er<sup>3+</sup>-doped NaYF<sub>4</sub> nanocrystals

Up-conversion luminescence polarization control in Er³⁺-doped NaYF₄ nanocrystals

Zhang Hui¹, Yao Yun-Hua², Zhang Shi-An^{2, †,}, Lu Chen-Hui³, Sun Zhen-Rong²

Schematic diagram of experimental arrangement for polarization control of UC luminescence in Er³⁺-doped NaYF₄ nanocrystals. Here, M1 and M3 are removable mirrors, which are used to switch the 1-kHz femtosecond laser amplifier and 80-MHz femtosecond laser oscillator.