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This paper reports that upconversion phenomenon exists in Tm3+-doped tellurite glass by pumping with both 793nm and 1064nm lasers. Strong 785nm two-photon upconversion fluorescence of 1G4 → 3H5 transition and weak three-photon upconversion 710nm, 677nm, fluorescence pumped by 793 nm Ti:Al2O3 laser has been observed firstly in Tm3+-doped tellurite glass. Upconversion has also been observed under excitation at 1064nm.
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Shixun Dai, Jianhu Yang, Lei Wen, Lili Hu, Zhonghong Jiang, "Upconversion phenomenon in Tm3+-doped tellurite glass," Proc. SPIE 5061, International Symposium on Photonic Glass (ISPG 2002), (16 July 2003); https://doi.org/10.1117/12.517393