[1] Paschotta R, Nilsson J, Tropper A C et al.. Ytterbium-doped fiber amplifiers[J]. IEEE J. Quant. Electron., 1997, 33(7)
[2] Luis Zenteno. High-power double-clad fiber lasers[J]. J. Lightwave of Technol., 1993, 11(9): 1435~1446
[6] Ball G A, Glenn W H. Design of single-mode linear-cavity erbium fiber laser utilizing Bragg reflectors[J]. J. Lightwave Technol., 1992, 10(10): 1338~1343
[8] Liu A, Song J, Kamatani K et al.. Rectangular double clad fiber laser with two end bundled pump[J]. Electron. Lett., 1996, 32(18): 1673~1674
[9] Weber T, Luthy W, Weber H P et al.., A longitudinal and side-pumped single transverse mode double-clad fiber with a special silicone coating[J]. Opt. Commun., 1995, 115(1): 99~104
[10] Su Hongxin, Lu Kecheng, Yan Peiguang et al.. DBR Yb-doped double-clad fiber laser operating at 1.06 μm[C]. Proc. SPIE, 2002, 4914: 426~429