[1] Leich M, Just F, Langner A et al. Highly efficient Yb-doped silica fibers prepared by powder sinter technology[J]. Optics Letters, 36, 1557-1559(2011). http://www.opticsinfobase.org/abstract.cfm?uri=ol-36-9-1557

[2] Schötz G, Just F, Leich M et al. New developments in high power fiber lasers based on alternative materials[C]. SPIE, 7914, 79141U(2011).

[3] Limpert J, Schreiber T, Nolte S et al. High-power air-clad large-mode-area photonic crystal fiber laser[J]. Optics Express, 11, 818-823(2003). http://europepmc.org/abstract/MED/19461794

[4] Schötz G, Reichel V, Leich M et al. Comparison of silica-based materials and fibers in side- and end-pumped fiber lasers[C]. SPIE, 7195, 71950Q(2009).

[5] Li W T, Chen D P, Zhou Q L et al. Watt-level output rectangular-core neodymium-doped silicate glass fiber laser[J]. Chinese Optics Letters, 14, 53-55(2016). http://www.cqvip.com/QK/85954X/201601/668120521.html

[6] Liu S, Zheng S P, Zheng Y K et al. Radiation-induced change of OH content in Yb-doped silica glass[J]. Chinese Optics Letters, 13, 5-8(2015). http://kns.cnki.net/KCMS/detail/detail.aspx?filename=gxkb201506002&dbname=CJFD&dbcode=CJFQ

[7] Poole S B, Payne D N, Mears R J et al. Fabrication and characterization of low-loss optical fibers containing rare-earth ions[J]. Journal of Lightwave Technology, 4, 870-876(1986). http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1074811

[8] Sekiya E H, Barua P, Saito K et al. Fabrication of Yb-doped silica glass through the modification of MCVD process[J]. Journal of Non-Crystalline Solids, 354, 4737-4742(2008). http://www.sciencedirect.com/science/article/pii/S0022309308004924

[9] Dhar A, Paul M C, Pal M et al. Characterization of porous core layer for controlling rare earth incorporation in optical fiber[J]. Optics Express, 14, 9006-9015(2006). http://www.ncbi.nlm.nih.gov/pubmed/19529280

[10] Tammela S, Söderlund M, Koponen J et al. The potential of direct nanoparticle deposition for the next generation of optical fibers[C]. SPIE, 6116, 61160G(2006).

[11] Wang J, Gray S, Walton D T et al. Advanced vapor-doping all-glass double-clad fibers[C]. SPIE, 6890, 689006(2008).

[12] Hamzaoui H E, Bigot L, Bouwmans G et al. From molecular precursors in solution to microstructured optical fiber: a sol-gel polymeric route[J]. Optical Materials Express, 1, 234-242(2011). http://www.opticsinfobase.org/abstract.cfm?uri=ome-1-2-234

[13] Langner A, Kayser T, Schötz G et al. -10-07(2010).

[14] Schötz G, Just F, Leich M et al. Design evolution, long term performance and application tests of extra large mode area (XLMA) fiber lasers[C]. SPIE, 8601, 86010G(2013).

[15] Langner A, Schötz G, Such M et al. A new material for high-power laser fibers[C]. SPIE, 6873, 687311(2008).

[16] Chen Danping. Preparation and fluorescence properties of high silica luminescent glasses[J]. Journal of the Chinese Ceramic Society, 35, 78-85(2007).

[17] Nakazawa E, Shionoya S. Cooperative luminescence in YbPO4[J]. Physical Review Letters, 25, 1710-1712(1970).

[18] Kim Y H, Paek U C, Han W T. Fiber length dependence of phase change induced by laser-diode pumping in Yb 3+-Al 3+ co-doped optical fibers [J]. Photonics Technology Letters, 14, 1710-1712(2002). http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1058260

[19] Monteil A, Chaussedent S, Alombert-Goget G et al. Clustering of rare earth in glasses, aluminum effect: experiments and modeling[J]. Journal of Non-Crystalline Solids, 348, 44-50(2004). http://www.sciencedirect.com/science/article/pii/S0022309304006660

[20] Gan Fuxi[M]. Optical glass, 20-26(1985).

[21] Wen Guangwu. Crystallization kinetics of different morphologies of fused silica glass[J]. Materials Science & Technology, 9, 1-5(2001).

[22] Lu Peiwen[M]. Inorganic material science foundation: silicate physical chemistry, 99-101(1996).

[24] Li Jianjun, Liu Xiaowei. Wang yue, et al. Infrared spectral features of SiO2 with different crystallinity and their implications[J]. Infrared, 31, 31-35(2010).

[25] Chen Hesheng, Sun Zhenya, Shao Jingchang. Investigation on FT-IR spectroscopy for eight different sources of SiO2[J]. Bulletin of the Chinese Ceramic Society, 30, 934-937(2011).