[1] Gapontsev V P,Misin S M,Isineev A A,et al.Erbium glass laser and their applications.Optics and laser Technol,1989,14:189～196
[2] Alam S U,Turner P W,Grudinnin A B,et al.High-power cladding pumped erbium-ytterbium co-doped fiber laser.OFC,2001,TuI4-1
[3] Snitzer E,Woodcock R.Yb3+-Er3+ glass laser.Appl Phys Lett,1965,6:45～46
[4] Townsend J E,Barnes W L,Jedrzejewski K P.Yb3+ sensitised Er3+doped silica optical fibre with ultrahigh transfer efficiency and gain.Electro Lett,1991,27(21):1958～1959
[5] Cheo P K,King G G.Clad-pumped Yb:Er codoped fiber lasers.IEEE Photon Technol Lett,2001.13(3):188～190
[6] Ding Ming,Cheo P K.Effects of Yb:Er-codoping on suppressing self-pulsing in Er-doped fiber lasers.IEEE Photon Technol Lett, 1997,9(3):324～326
[7] Arai K,Namikawa H,Kumata K,et al.Aluminum or phosphorus co-doping effects on the fluorescence and structural properties of neodymium-doped silica glass.J Appl Phys,1986,59(10):3430～3436
[8] Sudo S.Optical Fiber Amplifiers:Materials,Devices,and Applications.Boston,London,Artech house Inc,1997.77～85
[9] McCumber D E.Theory of photo-terminated optical masers.Phys Rev(A),1964,134(2):299～306
[10] Obaton A F,Parent C,Flem Le G,et al.Yb3+-Er3+-codoped LaLiP4O12 glass:a new eye-safe laser at 1535 nm.J Alloys Comp,2000.300-301;123～130
[11] Marvin J W,Jeanne E L,Douglas H B,et al.Dependence of the stimulated emission cross section of Yb3+ on host glass composition.IEEE J Quant Electro,1983,QE-19(10):1600～1608
[12] Zhang Long. Spectroscopic properties of highly rare-earth doped fluoride and tetraphoshate glasses. Ph.D Paper.2000.73～75
[13] Hwang B C,Jiang S,Lao T,et al.Characteriztion of cooperative upconversion and energy transfer of Er3+ and Yb3+/Er3+ doped phosphate glasses.SPIE,1999,3622:10～18
[14] Yang Jianhu,Dai Shixun,Hu Lili,et al.Optical spectroscopic properties of Er3+/Yb3+ codoped tellurite glasses.Acta Optica Sinica (to be published)
