[1] . W. Henderson, P. J. M. Suni, C. P. Hale et al.. Coherent laser-radar at 2 μm using solid-state lasers[J]. IEEE Trans. Geosci. Remote Sens., 1993, 31(1): 4-15.

[2] . J. Koch, M. Petros, J. Yu et al.. Precise wavelength control of a single-frequency pulsed HoTmYLF laser[J]. Appl. Opt., 2002, 41(9): 1718-1721.

[3] . C. Stoneman, L. Esterowitz. Efficient, broadly tunable, laser-pumped Tm-YAG and Tm-YSGG CW lasers[J]. Opt. Lett., 1990, 15(9): 486-488.

[4] S. D. Jackson. Cross relaxation and energy transfer upconversion process relevant to the function of 2 μm Tm3+-doped silica fiber lasers［J］. Opt. Commun., 2004, 230(1-3): 197～203

[5] 王耀祥. 光学玻璃的发展及其应用［J］. 应用光学, 2005, 26(5): 61～66

    Wang Yaoxiang. Development and applications of optical glasses［J］. J. Applied Optics, 2005, 26(5): 61～66

[6] . Wang, J. R. Lincoln, W. S. Brocklesby et al.. Fabrication and optical properties of lead-germanate glasses and a new class of optical fibers doped with Tm3+[J]. J. Appl. Phys., 1993, 73(12): 8066-8075.

[7] Bin Tang, Chunfeng Wu, Jiacheng Li et al.. Large-size oxyfluoride glasses used for vis-IR-transmitting windows［J］. J. Non-Cryst. Solids, 2009, 355(37-42): 2006～2009

[8] . . Investigation on germanium oxide-based glasses for infrared optical fibre development[J]. Opt. Mater., 2009, 31(11): 1701-1706.

[9] 唐彬, 王政, 羊毅 等. 掺饵透明氧氟锗酸盐微晶玻璃的制备及发光性能研究［J］. 光学学报, 2010, 30(8): 2344～2349

    Tang Bin, Wang Zheng, Yang Yi et al.. Synthesis and luminescence properties of Er3+-doped transparent oxy-fluoride germanate glass ceramics［J］. Acta Optica Sinica, 2010, 30(8): 2344～2349

[10] D. D. Martino, L. F. Santos, A. C. Marques et al.. Vibrational spectra and structure of alkali germinate glasses［J］. J. Non-Cryst. Solids, 2001, 293-295: 394～401

[11] 于春雷, 何冬兵, 汪国年 等. 锗酸盐玻璃中Yb3+/Tm3+/Ho3+掺杂浓度对2 μm发光的影响［J］. 光学学报, 2009, 29(11): 3143～3147

    Yu Chunlei, He Dongbing, Wang Guonian et al.. The effects of Yb3+/Tm3+/Ho3+ doping concentration on 2 μm wavelength luminescence in germanium glasses［J］. Acta Optica Sinica, 2009, 29(11): 3143～3147

[12] Brian M. Walsh, Norman P. Barnes, Donald J. Reichle et al.. Optical properties of Tm3+ ions in alkali germinate glass［J］. J. Non-Cryst. Solids, 2006, 352(50-51): 5344～5352

[13] . . 2 μm mid-infrared optical spectra of Tm3+-doped germanium gallate glasses[J]. Journal of Rare Earths, 2009, 27(5): 781-785.

[14] . . Highly efficient high-power thulium-doped germanate glass fiber laser[J]. Opt. Lett., 2007, 32(6): 638-640.

[15] N. P. Barnes, B. M. Walsh, D. J. Reichle et al.. Tm:germanate fiber laser: tuning and Q-switching［J］. Appl. Phys. B, 2007, 89(2-3): 299～304

[16] F. Fusari, A. A. Lagatsky, Gin Jose et al.. Laser operation of a bulk Tm3+germanate glass laser around 2 μm with 50 % internal slope efficiency［C］. LEOS Annual Meeting Conference Proceedings, 2009. 745～746

[17] . Fusari, A. A. Lagatsky, G. Jose et al.. Femtosecond mode-locked Tm3+ and Tm3+-Ho3+ doped 2 μm glass lasers[J]. Opt. Express, 2010, 18(21): 22090-22098.