[1] ZHENG Y L,ZHAO W,WANG X H,et al.The characters of femto-second Er3+ doped fiber amplifier[J].Acta Photonica Sinica,2004,33(3):268-271(in Chinese).
[2] SMART R G,HANNA D C,TROPPER A C,et al.CW room temperature up-conversion lasing at blue,green and red wavelengths in infrared pumped Pr3+-doped fluoride fiber[J].Electron Lett,1991,27 (14):1307-1309.
[3] KRUG P A,SCEAT M G,ATKINS G R.Intermediate excited-state absorption in erbium-doped fiber strongly pumped at 980nm[J].Opt Lett,1991,16(24):1976-1978.
[4] YANG L Z,DONG S F,ZHEN Y L,et al.Green luminescence analysis of ytterbium-doped double-clad silica fiber[J].Acta Photonica Sinica,2003,32(8):911-913(in Chinese).
[5] XIE C X,FU Y,ZHANG S M,et al.High power Er3+/Yb3+ co-doped fiber super fluorescent source[J].Laser Technology,2006,30(1):34-36(in Chinese).
[6] MA L N,HU Z L,HU Y M,et al.Study on up-conversion fluorescence of Er3+-doped fiber amplifier pumped at 980nm[J].Chinese Journal of Lasers,2005,32(11):1464-1468(in Chinese).
[7] BARNES W L,POOLE S B,TOWNSEND J E,et al.Er3+/Yb3+ and Er3+ doped fiber lasers[J].IEEE Journal of Lightwave Technology,1989,7(10):1461-1465.
[8] MAGNE S,OUERDANE Y,DRUETTA M,et al.Cooperative luminescence in an ytterbium-doped silica fiber[J].Opt Commun,1994,111:310-316.
[9] KIR'YANOV A V,MARTINEZ I L,KURKOV A S,et al.Cooperative luminescence and absorption in ytterbium-doped silica fiber and the fiber-nonlinear transmission coefficient at λ=980nm with a regard to the ytterbium ion-pairs'effect[J].Optics Express,2006,14(9):3981-3992.