[1] [1] David C. Brown, Hanna J. Hoffman. Thermal stress and thermal optic effects in high average power double-clad silica fiber lasers. IEEE J. Quant. Electron., 2001, 37 (12):207～217

[2] [2] J. Ε. Towensend, A. C. Tropper. Continuous-wave oscillation of a monomode ytterbium-doped fiber laser. Electron. Leii., 1988,24:1111～1113

[3] [3] Snitzer Ε., Po. H. Hakimi, F. Tumniinelli, Mccollum B. C. Ebuble-clad, offset core Nd fiber laser. Optical Fiber Communication conf., 1988, PD5

[4] [4] Η. M. Pask, J. L. Archambault, D. C. Hanna. Operation of cladding-pumped Yb3+-doped silica fibre lasers in 1 μm regions. Electron. Lett., 1994,30 (11): 863～865

[5] [5] Μ. Muedel, Β. Engstrom, D. Kea et al.. 35-Watt cw singlemode ytterbium fiber laser at 1.1 m. Proc. CLEO, 1997,Post-deadline paper CPD30-1

[6] [6] Boggavarapu D, Caffey D, He. Xet al.. Ultrahigh-power laser diode array pump source for fiber lasers. Tech. Dig. OFC'98, San Jose, CA, 1998, paper TuH7:47～48

[7] [7] V. Dominic, S. MacCormack, R. Waarts et al.. 110 W fiber laser. Electron. Lett., 1999,35(14): 1158～1160

[8] [8] Nie Qiuhua. Fiber Laser and Amplifier Tech. Electron Indus. Press, 1997. 10～12

[9] [9] J. E. Townsend, S. B. Poole, D. N. Payne. Sol-ution-doping technique for fabrication of rare-earth-doped optical fibers. Electron. Lett., 1987,23(7): 329～331

[10] [10] A. S. Kurkov, A. Yu. Laptev, Ε. M. Dianov et al.. Yb3 +-doped double-clad fibers and lasers. Proc. SPIEy 2000, 4083:118～126

[11] [11] Anping Liu, Kenichi Ueda. The absorption characteristics of circular, offset, and rectangular double-clad fibers. Opt. Comm., 1996, 132:511～518

[12] [12] Li Yigang, Fu Chengpeng, Su Hongxin et al.. Investigation of double-clad fiber laser. 2001 China Confer, for Photoelectron Apparatus and Integration, Guilin. 2001. 368～371 (in Chinese)

[13] [13] V. Reichel, S. Unger, V. Hagemann et al.. 8 W highly-efficient Yb-doped Fiber-Laser. Proc. SPIE, 2000. 3889:160～169