Up-conversion luminescence tuning in Er<sup>3+</sup>-doped ceramic glass by femtosecond laser pulse at different laser powers<xref rid="cpb_27_12_123201_fn1" ref-type="fn">*</xref><fn id="cpb_27_12_123201_fn1"><label>*</label><p>Project supported by the National Natural Science Foundation of China (Grant Nos. 51132004, 11474096, 11604199, U1704145, and 11747101), the Fund from the Science and Technology Commission of Shanghai Municipality, China (Grant No. 14JC1401500), the Henan Provincial Natural Science Foundation, China (Grant No. 182102210117), and the Higher Educational Key Program of Henan Province of China (Gant Nos. 17A140025 and 16A140030).</p></fn>

Up-conversion luminescence tuning in Er³⁺-doped ceramic glass by femtosecond laser pulse at different laser powers**

Project supported by the National Natural Science Foundation of China (Grant Nos. 51132004, 11474096, 11604199, U1704145, and 11747101), the Fund from the Science and Technology Commission of Shanghai Municipality, China (Grant No. 14JC1401500), the Henan Provincial Natural Science Foundation, China (Grant No. 182102210117), and the Higher Educational Key Program of Henan Province of China (Gant Nos. 17A140025 and 16A140030).

Cheng Wen-Jing^{1, †}, Liang Guo¹, Wu Ping¹, Zhao Shi-Hua¹, Jia Tian-Qing², Sun Zhen-Rong², Zhang Shi-An^{2, ‡}

(color online) Energy level diagram of Er³⁺ ions and the possible up-conversion processes for green and red luminescence generations by (a) unshaped and the V-shaped and (b) cosine-shaped femtosecond laser pulse.