[1] LIU Xue-ming，YANG Xiu-feng，LU Fu-yun，et al. Stable and uniform dual-wavelength erbium-doped fiber laser based on fiber Bragg gratings and photonic crystal fiber [J]. Optics Express(S1094-4087)，2005，13(1)：142-147.

[2] Fermann M E，Galvanauskas A，Sucha G，et al. Fiber-lasers for ultrafast optics [J]. Appl. Phys. B(S0946-2171)，1997，65：259-275.

[3] LI Kang，WANG Yi-shan，ZHAO Wei，et al. High-power double-clad large-mode-area photonic crystal fibre laser [J]. Proc. of SPIE，2007，6028：124-127.

[4] Tünnermann A，Hofer S，Liem A，et al. High-power fiber lasers and amplifiers [J]. Proc. of SPIE，2004，5620：134-146.

[5] RUAN Shuang-chen，FENG Ming，WEN Hua-hu，et al. Yb3+-doped Double Clad Fiber Laser with a Output Power of 7.2 W [J]. Acta Photonica Sinica，2003，32(8)：911-913.

[6] YAO Jian-quan，XU De-gang. Thermal effect analysis in the process of highpower frequency doubling [J]. Chinese Journal Of Quantum Electronics，2005，22(4)：482-487.

[7] YAO Jian-quan，REN Guang-jun，ZHANG Qiang，et al. Yb doped double clad fiber laser and pump coupling technology [J]. Laser Journal，2006，27(5)：1-4.

[8] Huttunen Anu，T rm P. Optimization of Dual-Core and Microstructure Fiber Geometries for Dispersion Compensation and Large Mode Area [J]. Optics Express(S1094-4087)，2005，13(2)：627-635.

[9] ZHANG Bing，CHEN Qi，WANG De-qiang. Effect of MnO/MnO2 Addition on the Properties of Low melting Phosphate Glass [J]. Journal of the Chinese Ceramic Society，2008，36(4)：535-543.

[10] SU Hong-xin，LI Yi-gang，LU Ke-cheng，et al. Wavelength tunable Yb3+-doped double-clad photonic crystal fiber laser [J]. Proc. of SPIE，2008，6823：18-19.

[11] Schmidt O，Rothhardt J，Eidam T，et al. Single-polarization ultra-large-mode-area Yb-doped photonic crystal fiber [J]. Optics Express(S1094-4087)，2008，16(6)：3918-3923.