[1] Zhu Jun, Dai Shixun, Chen Feifei et al.. Mid-infrared emission properties of Ho3+ ion in nanocrystals embedded chalcohalide glass ceramics［J］. Acta Optica Sinica, 2010, 30(7): 1916～1920

[2] Guonian Wang, Shixun Dai, Junjie Zhang et al.. Upconversion emissions in Yb3+-Tm3+-doped tellurite glasses exited at 976 nm［J］. J. Mater. Sci., 2007, 42(3): 747～751

[3] D. Milanese, M. Vota, Q. Chen et al.. Investigation of infrared emission and lifetime in Tm-doped 75TeO220ZnO5Na2O (mol%) glasses: Effect of Ho and Yb codoping［J］. Journal of Non-Crystalline Solids, 2008, 354(18): 1955～1961

[4] Y. Tsang, B. Richards, D. Binks et al.. A Yb3+/Tm3+/Ho3+ triply-doped tellurite fibre laser［J］. Opt. Express, 2008, 16(14): 10690～10695

[5] B. Zhou, E. Y. B. Pun, H. Lin et al.. Judd-Ofelt analysis, frequency upconversion, and infrared photoluminescence of Ho3+-doped and Ho3+/ Yb3+ co-doped lead bismuth gallate oxide glasses［J］. J. Appl. Phys., 2009, 106(10): 103105

[6] L. D. da Vila, L. Gomes, C. R. Eyzaguirre et al.. Time resolved luminescence in (TmHo) doped tellurite glass［J］. Optical Materials, 2005, 27(8): 1333～1339

[7] Chen Ganxin, Zhang Qinyuan, Yang Gangfeng et al.. 2.0 μm emission properties and energy transfer of Tm3+/Ho3+-codoped tellurite glass［J］. Acta Physica Sinica, 2007, 56(7): 4200～4206

[8] Guojun Gao, Guonian Wang, Chunlei Yu et al.. Investigation of 2.0 μm emission in Tm3+ and Ho3+ co-doped oxyfluoride tellurite glass［J］. Journal of Luminescence, 2009, 129(9): 1042～1047

[9] J. Heo, D. Lam, G. H. Sigel et al.. Spectroscopic analysis of the structure and properties of alkali tellurite glasses［J］. Journal of the American Ceramic Society, 1992, 75(2): 277～281

[10] Y. Himei, A. Osaka, T. Nanba et al.. Coordination change of Te atoms in binary tellurite glasses［J］. Journal of Non-Crystalline Solids, 1994, 177: 164～169

[11] Yu Xiaobo, Wang Naiqin, Zhao Xin et al.. Up conversion white lighting in Tm3+/Ho3+/Yb3+ doped bismuth tellurite glasses［J］. Acta Optica Sinica, 2010, 30(7): 1926～1930

[12] Wang Dagang, Zhou Yaxun, Dai Shixun et al.. Influence of Bi2O3 on three fundamental color upconversion luminescence of Tm3+/Ho3+/Yb3+-codoped tellurite glasses［J］. Chinese J. Lasers, 2011, 38(4): 0406001

[13] B. R. Judd. Optical absorption intensities of rare-earth ions［J］. Phys. Rev., 1962, 127(3): 750～761

[14] G. S. Ofelt. Intensities of crystal spectra of rare-earth ions［J］. J. Chem. Phys., 1962, 37(3): 511～520

[15] C. K. Jorgensen, R. Reisfeld. Judd-Ofelt parameters and chemical bonding［J］. Journal of the Less Common Metals, 1983, 93(1): 107～112

     C. K. Jorgensen, R. Reisfeld. Judd-Ofelt parameters and chemical bonding［J］. Journal of the Less Common Metals, 1983, 93(1): 107～112

[16] P. R. Watekar, S. Ju, W. T. Han. Optical properties of Ho-doped alumino-germano-silica glass optical fiber［J］. Journal of Non-Crystalline Solids, 2008, 354(14): 1453～1459

     P. R. Watekar, S. Ju, W. T. Han. Optical properties of Ho-doped alumino-germano-silica glass optical fiber［J］. Journal of Non-Crystalline Solids, 2008, 354(14): 1453～1459

[17] Q. Zhang, G. R. Chen, G. Zhang et al.. Spectroscopic properties of Ho3+/Yb3+ codoped lanthanum aluminum germanate glasses with efficient energy transfer［J］. J. Appl. Phys., 2009, 106(11): 113102

     Q. Zhang, G. R. Chen, G. Zhang et al.. Spectroscopic properties of Ho3+/Yb3+ codoped lanthanum aluminum germanate glasses with efficient energy transfer［J］. J. Appl. Phys., 2009, 106(11): 113102

[18] Guojun Gao, Lili Hu, Huiyan Fan et al.. Investigation of 2.0 μm emission in Tm3+ and Ho3+ co-doped TeO2-ZnO-Bi2O3 glasses［J］. Optical Materials, 2009, 32(2): 402～405

     Guojun Gao, Lili Hu, Huiyan Fan et al.. Investigation of 2.0 μm emission in Tm3+ and Ho3+ co-doped TeO2-ZnO-Bi2O3 glasses［J］. Optical Materials, 2009, 32(2): 402～405

[19] N. Sooraj Hussain, N. Ali, A. G. Dias et al.. Absorption and emission properties of Ho3+ doped lead-zinc-borate glasses［J］. Thin Solid Films, 2006, 515(1): 318～325

     N. Sooraj Hussain, N. Ali, A. G. Dias et al.. Absorption and emission properties of Ho3+ doped lead-zinc-borate glasses［J］. Thin Solid Films, 2006, 515(1): 318～325

[20] Meng Wang, Guonian Wang, Lixia Yi et al.. 2 μm emission performance of Tm3+-Ho3+ co-doped tellurite glasses［J］. Chin. Opt. Lett., 2010, 8(1): 78～81

     Meng Wang, Guonian Wang, Lixia Yi et al.. 2 μm emission performance of Tm3+-Ho3+ co-doped tellurite glasses［J］. Chin. Opt. Lett., 2010, 8(1): 78～81

[21] D. E. McCumber. Theory of phonon-terminated optical masers［J］. Phys. Rev., 1964, 134(2A): A299～A306

     D. E. McCumber. Theory of phonon-terminated optical masers［J］. Phys. Rev., 1964, 134(2A): A299～A306

[22] Yujin Chen, Yidong Huang, Zundu Luo. Spectroscopic properties of Yb3+ in bismuth borate glasses［J］. Chemical and Physics Letters, 2003, 382(3-4): 481～488

     Yujin Chen, Yidong Huang, Zundu Luo. Spectroscopic properties of Yb3+ in bismuth borate glasses［J］. Chemical and Physics Letters, 2003, 382(3-4): 481～488

[23] Y. C. Yan, A. J. Faber, H. D. Waal. Luminescence quenching by OH groups in highly Er-doped phosphate glasses［J］. Journal of Non-Crystalline Solids, 1995, 181(3): 283～290

     Y. C. Yan, A. J. Faber, H. D. Waal. Luminescence quenching by OH groups in highly Er-doped phosphate glasses［J］. Journal of Non-Crystalline Solids, 1995, 181(3): 283～290

[24] Jun Xu, Liangbi Su, Hongjun Li et al.. High quantum fluorescence yield of Er3+ at 1.5 μm in an Yb3+, Ce3+-codoped CaF2 crystal［J］. Optical Materials, 2007, 29(8): 932～935

     Jun Xu, Liangbi Su, Hongjun Li et al.. High quantum fluorescence yield of Er3+ at 1.5 μm in an Yb3+, Ce3+-codoped CaF2 crystal［J］. Optical Materials, 2007, 29(8): 932～935