[1] JAUREGUI C, LIMPERT J, TNNERMANN A. High-power fibre lasers[J]. Nature Photonics, 2013, 7(11): 861-867.
[2] ZERVAS M N, CODEMARD C A. High power fiber lasers: a review[J]. IEEE Journal of Selected Topics in Quantum Electronics, 2014, 20(5): 1-23.
[3] GAPONTSEV V, FOMIN V, FERIN A, et al.. Diffraction limited ultra-high-power fiber lasers[C].Advanced Solid-State Photonics, 2010.
[4] SHINER B. The impact of fiber laser technology on the world wide material processing market[C].CLEO: Applications and Technology, 2013.
[5] DIGIOVANNI D J, STENTZ A J. Tapered fiber bundles for coupling light into and out of cladding-pumped fiber devices: US, US5864644[P]. 1999.
[6] RASMUSSEN M H. Fiber bundles and methods of making fiber bundles: US, US7236671[P]. 2007.
[7] GOLDBERG L, COLE B, SNITZER E. V-groove side-pumped 1.5 μm fibre amplifier[J]. Electronics Letters, 1997, 33(25): 2127-2129.
[8] KOPLOW J P, GOLDBERG L, KLINER D A V. Compact 1-W Yb-doped double-cladding fiber amplifier using V-groove side-pumping[J]. Photonics Technology Letters, IEEE, 1998, 10(6): 793-795.
[9] KOPLOW J P, MOORE S W, KLINER D A V. A new method for side pumping of double-clad fiber sources[J]. IEEE Journal of Quantum Electronics, 2003, 39(4): 529-540.
[10] WEBER T, LTHY W, WEBER H P. Side-pumped fiber laser[J]. Applied Physics B, 1996, 63(2): 131-134.
[11] HUANG C W, CHANG C L, JHENG D Y, et al.. Symmetrically side-pumped 10 W ytterbium-doped fiber laser by sub-wavelength grating coupler[C].Lasers and Electro-Optics Europe, 2011: 1.
[12] HERDA R, LIEM A, SCHNABEL B, et al.. Efficient side-pumping of fibre lasers using binary gold diffraction gratings[J]. Electronics Letters, 2003, 39(3): 276-277.
[13] LIN S L, LEE Y W, HSU K Y, et al.. Design of resonantly side-pumped 1 645 nm Er∶YAG crystal fiber lasers with grating couplers[C].Lasers and Electro-Optics Pacific Rim, 2013: 1-2.
[14] HUANG C W, HUANG D W, CHANG C L, et al.. Demonstration of side coupling between high power laser diode array and double-clad fiber using sub-wavelength grating[C].CLEO: 2011-Laser Science to Photonic Applications, 2011: 1-2.
[15] QIRONG X, PING Y, HAICHUI R, et al.. A side-pump coupler with refractive index valley configuration for fiber lasers and amplifiers[J]. Lightwave Technology, 2013, 31(16): 2715-2722.
[16] YI B K.A Fused Side-Pumping Optical Fiber Coupler Based on Twisting[D]. Changsha: National University of Defense Technology, 2012. (in Chinese)
[17] VALENTIN G P, IGOR S. Coupling arrangement between a multi-mode light source and an optical fiber through an intermediate optical fiber length: US, US5999673[P]. 1999.
[18] THEEG T, SAYINC H, NEUMANN J, et al.. Pump and signal combiner for bi-directional pumping of all-fiber lasers and amplifiers[J]. Optics Express, 2012, 20(27): 28125-28141.
[19] THEEG T, SAYINC H, NEUMANN J, et al.. All-fiber counter-propagation pumped single frequency amplifier stage with 300 W output power[J]. Photonics Technology Letters, IEEE, 2012, 24(20): 1864-1867.
[20] QIRONG X, YAN P, YAPING W. Fused angle-polished multi-points side-pumping coupler for monolithic fiber lasers and amplifiers[J]. Optics Communications, 2012(285): 2137-2143.
[21] QIRONG X, PING Y. 100 W ytterbium-doped monolithic fiber laser with fused angle-polished side-pumping configuration[J]. Laser Physics Letters, 2011, 8(2): 125.
[22] PAN O, PING Y, MALI G. Studies of pump light leakage out of couplers for multi-coupler side-pumped Yb-doped double-clad fiber lasers[J]. Optics Communications, 2004(239): 421-428.
[23] XIAO C, QI RONG X, GUANG YONG J. High coupling efficiency and low signal light loss (2+1)×1 coupler[J]. Chin. Phys. B, 2015, 24(6): 64208.
[24] WANG X J, XIAO Q R, YAN P, et al.. 3000 W direct-pumping all-fiber laser based on domestically produced fiber[J]. Acta Physica Sinica, 2015, 64(16): 257-262. (in Chinese)
[25] XIAO Q, YAN P, LI D, et al.. Bidirectional pumped high power Raman fiber laser[J]. Optics Express, 2016, 24(6): 6758-6768.
[26] XIAO Q R, ZHANG D Y, WANG Z H, et al.. Review of high power fiber laser pump coupling technology[J]. Chinese Journal of Lasers, 2017, 44(2): 201008. (in Chinese)
[27] QIRUI T, TINGWU G. Cascaded combiners for a high power CW fiber laser[J]. Laser Physics, 2016, 26(2): 25102.
[28] CHEN X, XIAO Q, JIN G, et al.. Pump couplers in a cascaded structure[J]. International Journal of Nanotechnology, 2015, 12(10): 926-934.
[29] LEI C, CHEN Z, LENG J, et al.. The influence of fused depth on the side-pumping combiner for all-fiber lasers and amplifiers[J]. Journal of Lightwave Technology, 2017(1): 99.
[30] LEI CH M, CHEN Z L, LENG J Y, et al.. The research of high power all-fiber (2+1)×1 side-pumped combiner[J]. Chinese Journal of Lasers, 2017, 44(5): 8-12. (in Chinese)
[31] HANAFUSA H, HORIGUCHI M, NODA J. Thermally-diffused expanded core fibres for low-loss and inexpensive photonic components[J]. Electronics Letters, 1991, 27(21): 1968-1969.
[32] SHIRAISHI K, YANAGI T, KAWAKAMI S. Light-propagation characteristics in thermally diffused expanded core fibers[J]. Lightwave Technology Journal, 1993, 11(10): 1584-1591.
[33] XIAO Q, CHEN X, REN H, et al.. Fiber coupler for mode selection and high-efficiency pump coupling[J]. Optics Letters, 2013, 38(7): 1170-1172.
[34] ZHOU P, XIAO H, LENG J, et al.. High-power fiber lasers based on tandem pumping[J]. Journal of the Optical Society of America B, 2017, 34(3): A29-A36.
[35] XIAO H, LENG J Y, ZHOU P, et al.. High power tandem-pumped Yb-doped fiber laser[J]. Chinese Journal of Lasers, 2017, 44(2): 94-105. (in Chinese)
[36] GU Y, LEI C, LIU J, et al.. Side-pumping combiner for high-power fiber laser based on tandem pumping[J]. Optical Engineering, 2017, 56(11): 116109.