[1] IPG Photonics successfully tests the wld''s first 10kilowatt singlemode production laser[EBOL]. http:www.ipgphotonics.com, 2019.
[2] Khitrov V, Minelly J D, Tumminelli R, et al. 3 kW singlemode direct diodepumped fiber laser[C]SPIE, 2014, 8961: 89610V.
[3] Shima K, Ikoma S, Uchiyama K, et al. 5kW single stage allfiber Ybdoped singlemode fiber laser f materials processing[C]SPIE, 2018, 10512: 105120C.
[4] B L Yang, C Shi, H W Zhang, et al. Monolithic fiber laser oscillator with record high power. Laser Physics Letters, 15, 75106(2018).
[5] Bansal L, Headley C E. High efficiency pump signal combiner f high power fiber amplifier laser applications: US patent, 20160139336[P]. 20160519.
[6] Chenmin Lei, Yanran Gu, Zilun Chen, et al. Development of high power all-fiber side-pumping combiner. Optics and Precision Engineering, 26, 1561-1569(2018).
[7] T Theeg, H Sayinc, J Neumann, et al. Pump and signal combiner for bi-directional pumping of all-fiber lasers and amplifiers. Optics Express, 20, 28125(2012).
[8] Zilun Chen, Xuanfeng Zhou, Zefeng Wang, et al. Review of all-fiber signal combiner for high power fiber lasers (Invited). Infrared and Laser Engineering, 47, 0103005(2018).
[9] Libo Li, Qihong Lou, Jun Zhou, et al. High power single transverse mode operation of a tapered large-mode-area fiber laser. Optics Communications, 281, 655-657(2008).
[10] J Zheng, W Zhao, B Zhao, et al. High pumping-power fiber combiner for double-cladding fiber lasers and amplifiers. Optical Engineering, 57, 1(2018).
[11] Biao Wang, Lu Pang, Yongqing Yi, et al. 3.2 kW laser output by domestic 25/400 μm Yb-doped fiber. Infrared and Laser Engineering, 48, 0706009(2019).
[12] P Koška, Y Baravets, P Peterka, et al. Mode-field adapter for tapered-fiber-bundle signal and pump combiners. Applied Optics, 54, 751-756(2015).
[13] Gonthier F, Martineau L, Seguin F, et al. Optical coupler comprising multimode fibers method of making the same: US Patent, 7 046875[P]. 2006516.
[14] S Yin, P Yan, M Gong, et al. Fusion splicing of double-clad specialty fiber using active alignment technology. Chinese Optics Letters, 9, 020601(2011).
[15] Q Xiao, P Yan, H Ren, et al. Pump-signal combiner with large-core signal fiber feed-through for fiber lasers and amplifiers. Applied Optics, 52, 409-414(2013).
[16] Zimer H, Kozak M, Liem A. Fiber fiberoptic components f high power fiber laser[C]SPIE, 2011, 7914: 791414.
[17] Q Xiao, P Yan, Y Wang, et al. Fused angle-polished multi-points side-pumping coupler for monolithic fiber lasers and amplifiers. Optics Communications, 285, 2137-2143(2012).
[18] Y Yang, J Lee, K Reichard, et al. Fabrication and implementation of a multi-to-single mode converter based on a tapered multimode fiber. Optics Communications, 249, 129-137(2005).
[19] A Hideur, T Chartier, C Özkul, et al. Dynamics and stabilization of a high power side-pumped Yb-doped double-clad fiber laser. Optics Communications, 186, 311-317(2000).
[20] J Xu, J Lu, G Kumar, et al. A non-fused fiber coupler for side-pumping of double-clad fiber lasers. Optics Communications, 220, 389-395(2003).
[21] Zhan H, Wang Y, Peng, et al. 2 kW (2+1) GTwave fiber amplifier[J]. Laser Phys Lett, 2016, 13: 045103.
[22] C Jauregui, S Böhme, G Wenetiadis, et al. Side-pump combiner for all-fiber monolithic fiber lasers and amplifiers. Journal of the Optical Society of America B, 27, 1011-1015(2010).
[23] D Marcuse. Loss analysis of single-mode fiber splices. Bell System Technical Journal, 56, 703-718(1977).
[24] S C Mettler. A general characterization of splice loss for multimode optical fibers. Bell System Technical Journal, 58, 2163-2182(2014).
