[1] [1] Gapontsev V P, Mtisin S M, Isineev A A et al.. Erbium glass lasers and their applications. Opt. & Laser Technol., 1989, 14(4):189～196

[2] [2] Laporta P, Taccheo S, LonghiS et al.. Diode-pumped microchip Er-Yb∶glass laser. Opt. Lett., 1993, 18(15):1232～1234

[3] [3] MacFarlane D R, Javorniczky J, Newman P J et al.. High Er(3) content ZBN-glasses for microchip laser applications. J. Non-Cryst. Solids, 1997, 213,214(1-3):158～163

[4] [4] Taccheo S, Laporta P, Longhi S et al.. Diode-pmped bulk erbium-ytterbium lasers. Appl. Phys. (B), 1996, 63(5):425～436

[5] [5] Ohtsuki T, Peyghambarian N, Honkanen S et al.. Gain characteristics of a high concentration Er3+-doped phosphate glass waveguide. J. Appl. Phys., 1995, 78(6):3617～3621

[6] [6] Jiang S, Myers M J, Peyghambarian N. Er3+ doped phosphate glasses and laser. J. Non-Cryst. Solids, 1998, 239(1-3):143～148

[7] [7] Ohtsuki T, Hongkanen S, Najafi S I et al.. Cooperative upconversion effects on the performance of Er3+-doped phosphate glass waveguide amplifiers. J. Opt. Soc. Am. (B), 1997, 14(7):1838～1845

[8] [8] Hwang B C, Jiang S, Luo T et al.. Characterization of cooperative upconversion and energy transfer of Er3+ and Yb3+/Er3+ doped phosphate glasses. Proc. SPIE, 1999, 3622:10～18

[9] [9] Qi Changhong, Gan Fuxi. Spectral properties of glassy tetraphosphate with high neodynium concentration. J. Laser, 1983, 9(4):691～694

[10] [10] Choi Y G, Kim K H, Heo J. Spectroscopic properties of and energy transfer in PbO-Bi2O3-Ga2O3 glass doped with Er2O3. J. Am. Ceram. Soc., 1999, 82(10):2762～2768

[11] [11] McCumber D E. Theory of phonon-terminated optical masers. Phys. Rev. (A), 1964, 134(2):299～306

[12] [12] Miniscalco W J, Quimby R S. General procedure for the analysis of Er3+ cross sections. Opt. Lett., 1991, 16(4):258～260

[13] [13] Payne S A, Chase L L, Smith L K et al.. Infrared cross-section measurements for crystals doped with Er3+, Tm3+, and Ho3+. IEEE J. Quant. Electron., 1992, QE-28(6):2619～2630

[14] [14] Laporta P, Longhi S, Sorbello G et al.. Erbium-ytterbium miniaturized lasers devices for optical communication. Proc. SPIE, 1999, 3622:82～91

[15] [15] Desurvire E. Erbium-Doped Fiber Amplifiers: Principles and Applications. New York: Wiley, 1992. 291

[16] [16] Wageber J L, Wysocki P F, Digonner M J F et al.. Effects of concentration and clusters in erbium-doped fiber lasers. Opt. Lett., 1993, 18(23):2014～

[18] [18] Ebendorff-Heidepriem H, Seeber W, Ehrt D. Spectroscopic properties of Nd3+ ions in phosphate glasses. J. Non-Cryst. Solids, 1995, 183(1,2):191～200

[19] [19] Snoeks E, Kik P G, Polman A. Concentration quenching in erbium implanted alkali silicate glasses. Opt. Mater., 1996, 5(1):159～167