[1] D. J. Richardson, J. Nilsson, W. A. Clarkson. High power fiber lasers: current status and future perspectives [Invited]. J. Opt. Soc. Am. B, 27, B63(2010).
[2] C. Jauregui, J. Limpert, A. Tünnermann. High-power fibre lasers. Nat. Photonics, 7, 861(2013).
[3] B. Yang, H. Zhang, Q. Ye, H. Pi, C. Shi, R. Tao, X. Wang, X. Xu. 4.05 kW monolithic fiber laser oscillator based on home-made large mode area fiber Bragg gratings. Chin. Opt. Lett., 16, 031407(2018).
[4] Y. Xiao, F. Brunet, M. Kanskar, M. Faucher, A. Wetter, N. Holehouse. 1-kilowatt CW all-fiber laser oscillator pumped with wavelength-beam-combined diode stacks. Opt. Express, 20, 3296(2012).
[5] H. Yu, X. Wang, R. Tao, P. Zhou, J. Chen. 1.5 kW, near-diffraction-limited, high-efficiency, single-end-pumped all-fiber-integrated laser oscillator. Appl. Opt., 53, 8055(2014).
[6] B. Yang, H. Zhang, C. Shi, X. Wang, P. Zhou, X. Xu, J. Chen, Z. Liu, Q. Lu. Mitigating transverse mode instability in all-fiber laser oscillator and scaling power up to 2.5 kW employing bidirectional-pump scheme. Opt. Express, 24, 27828(2016).
[7] B. Yang, H. Zhang, S. Chen, R. Tao, Q. Lu. 3.05 kW monolithic fiber laser oscillator with simultaneous optimizations of stimulated Raman scattering and transverse mode instability. J. Opt., 20, 025802(2017).
[8] C. A. Robin, I. Hartl, S. Ikoma, H. K. Nguyen, M. Kashiwagi, K. Uchiyama, K. Shima, D. Tanaka. 3 kW single stage all-fiber Yb-doped single-mode fiber laser for highly reflective and highly thermal conductive materials processing. Proc. SPIE, 10083, 100830Y(2017).
[9] K. Shima, S. Ikoma, K. Uchiyama, Y. Takubo, M. Kashiwagi, D. Tanaka. 5-kW single stage all-fiber Yb-doped single-mode fiber laser for materials processing. Proc. SPIE, 10512, 105120C(2018).
[10] B. Yang, C. Shi, H. Zhang, Q. Ye, H. Pi, R. Tao, X. Wang, P. Ma, J. Leng, Z. Chen, P. Zhou, X. Xu, J. Chen, Z. Liu. Monolithic fiber laser oscillator with record high power. Laser Phys. Lett., 15, 075106(2018).
[11] B. Yang, P. Wang, H. Zhang, X. Xi, C. Shi, X. Wang, X. Xu. 6 kW single mode monolithic fiber laser enabled by effective mitigation of the transverse mode instability. Opt. Express, 29, 26366(2021).
[12] Y. Ye, B. Yang, P. Wang, L. Zeng, X. Xi, C. Shi, H. Zhang, X. Wang, P. Zhou, X. Xu. Industrial 6 kW high-stability single-stage all-fiber laser oscillator based on conventional large mode area ytterbium-doped fiber. Laser Phys., 31, 035104(2021).
[13] Y. Wang, R. Kitahara, W. Kiyoyama, Y. Shirakura, T. Kurihara, Y. Nakanish, T. Yamamoto, M. Nakayama, S. Ikoma, K. Shima. 8-kW single-stage all-fiber Yb-doped fiber laser with a BPP of 0.50 mm-mrad. Proc. SPIE, 11260, 1126022(2020).
[14] W. Liu, P. Ma, H. Lv, J. Xu, P. Zhou, Z. Jiang. General analysis of SRS-limited high-power fiber lasers and design strategy. Opt. Express, 24, 26715(2016).
[15] W. Gao, B. Zhao, W. Fan, P. Ju, Y. Zhang, G. Li, Q. Gao, Z. Li. Instability transverse mode phase transition of fiber oscillator for extreme power lasers. Opt. Express, 27, 22393(2019).
[16] M. Wang, Z. Li, L. Liu, Z. Wang, X. Gu, X. Xu. Fabrication of chirped and tilted fiber Bragg gratings on large-mode-area doubled-cladding fibers by phase-mask technique. Appl. Opt., 57, 4376(2018).
[17] K. Jiao, J. Shu, H. Shen, Z. Guan, F. Yang, R. Zhu. Fabrication of kW-level chirped and tilted fiber Bragg gratings and filtering of stimulated Raman scattering in high-power CW oscillators. High Power Laser Sci. Eng., 7, e31(2019).
[18] M. Bernier, R. Vallée, B. Morasse, C. Desrosiers, A. Saliminia, Y. Sheng. Ytterbium fiber laser based on first-order fiber Bragg gratings written with 400 nm femtosecond pulses and a phase-mask. Opt. Express, 17, 18887(2009).
[19] H. Li, X. Zhao, B. Rao, M. Wang, B. Wu, Z. Wang. Fabrication and characterization of line-by-line inscribed tilted fiber Bragg gratings using femtosecond laser. Sensors, 21, 6237(2021).
[20] L. Lei, H. Li, J. Shi, Q. Hu, X. Zhao, B. Wu, M. Wang, Z. Wang. Miniature Fabry-Perot cavity based on fiber Bragg gratings fabricated by fs laser micromachining technique. Nanomaterials, 11, 2505(2021).
[21] M. L. Åslund, N. Jovanovic, N. Groothoff, J. Canning, G. D. Marshall, S. D. Jackson, A. Fuerbach, M. J. Withford. Optical loss mechanisms in femtosecond laser-written point-by-point fibre Bragg gratings. Opt. Express, 16, 14248(2008).
[22] R. J. Williams, N. Jovanovic, G. D. Marshall, G. N. Smith, M. J. Steel, M. J. Withford. Optimizing the net reflectivity of point-by-point fiber Bragg gratings: the role of scattering loss. Opt. Express, 20, 13451(2012).
[23] R. G. Krämer, C. Matzdorf, A. Liem, V. Bock, W. Middents, T. A. Goebel, M. Heck, D. Richter, T. Schreiber, A. Tünnermann, S. Nolte. Femtosecond written fiber Bragg gratings in ytterbium-doped fibers for fiber lasers in the kilowatt regime. Opt. Lett., 44, 723(2019).
[24] R. G. Krämer, F. Möller, C. Matzdorf, T. A. Goebel, M. Strecker, M. Heck, D. Richter, M. Plötner, T. Schreiber, A. Tünnermann, S. Nolte. Extremely robust femtosecond written fiber Bragg gratings for an ytterbium-doped fiber oscillator with 5 kW output power. Opt. Lett., 45, 1447(2020).
[25] H. Li, X. Tian, M. Wang, X. Zhao, B. Wu, C. Gao, H. Li, B. Rao, X. Xi, Z. Wang. Fabrication of fiber Bragg gratings by visible femtosecond laser for multi-kw fiber oscillator. IEEE Photon. J., 14, 1510904(2022).
[26] C. W. Smelser, D. Grobnic, S. J. Mihailov. Generation of pure two-beam interference grating structures in an optical fiber with a femtosecond infrared source and a phase mask. Opt. Lett., 29, 1730(2004).