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Mode instability (MI) is an abrupt mode change when the average output power increases above a certain threshold power, which results in degrading beam quality and restricting the enhancement of power output for diffraction-limited high power fiber laser. The experimental study on MI in all-fiberized master oscillator power amplifer (MOPA) is presented in detail for the first time. It is revealed that MI in all-fiberized MOPA results in reducing the slope efficiency. The theoretical threshold power of MI for 20/400 step-index large-mode-area double-cladding Yb-doped fiber is about 1 kW and MI is rooted mainly from the thermal effect.
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Keywords:
- mode instability /
- fiber amplifier /
- quantum defect /
- thermal effect
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[69] -
[1] Richardson D J, Nilsson J, Clarkson W A 2010 J. Opt. Soc. Am. B 27 B63
[2] [3] Zhu J J, Du W B, Zhou P, et al. 2012 Acta Phys. Sin. 61 064209 (in Chinese) [朱家健, 杜文博, 周朴 等 2012 61 064209]
[4] [5] Yang W Q, Hou J, Song R, et al. 2011 Acta Phys. Sin. 60 84210 (in Chinese) [杨未强, 侯静, 宋锐 等 2011 60 84210]
[6] Xiao H, Wu W M, Xu J M, et al. 2011 Chin. Phys. B 20 114208
[7] [8] Jauregui C, Eidam T, Otto H J, et al. 2012 Opt. Express 20 12912
[9] [10] Eidam T, Wirth C, Jauregui C, et al. 2011 Opt. Express 19 13218
[11] [12] Engin D, Lu W, Verdun H, Gupta S 2013 Proc. of SPIE 8733 87330J
[13] [14] [15] Eidam T, Hanf S, Seise E, et al. 2010 Opt. Lett. 35 94
[16] [17] Stutzki F, Otto H J, Jansen F, et al. 2011 Opt. Lett. 36 4572
[18] [19] Otto H-J, Jauregui C, Stutzki F 2013 Opt. Express 21 17285
[20] Laurila M, Jorgensen M M, Hansen K R, et al. 2012 Opt. Express 20 5742
[21] [22] [23] Jansen F, Stutzki F, Otto H J, et al. 2012 Opt. Express 20 3997
[24] [25] Ward B, Robin C, Dajani I, et al. 2012 Opt. Express 20 11407
[26] [27] Otto H-J, Stutzki F, Jansen F, et al. 2012 Opt. Express 20 15710
[28] Haarlammert N, Vries O, Liem A, et al. 2012 Opt. Express 20 13274
[29] [30] Jauregui C, Eidam T, Limpert J, et al. 2011 Opt. Express 19 3258
[31] [32] Smith A V, Smith J J 2011 Opt. Express 19 10180
[33] [34] Smith A V, Smith J J 2013 Opt. Express 21 2606
[35] [36] [37] Smith A V, Smith J J 2012 Opt. Express 20 24545
[38] Hansen K R, Alkeskjold T T, Broeng J, et al. 2012 Opt. Lett. 37 2382
[39] [40] [41] Hansen K R, Alkeskjold T T, Broeng J, et al. 2013 Opt. Express 21 1944
[42] [43] Dong L 2013 Opt. Express 21 2642
[44] Hu I N, Zhu C, Zhang C, et al. 2013 Proc. SPIE 8601 860109
[45] [46] Jauregui C, Ottoa H J, Jansena F, et al. 2013 Proc. SPIE 8601 86010F
[47] [48] Jauregui C, Otto H J, Stutzki F, et al. 2013 Opt. Express 21 19375
[49] [50] Ward B 2013 Opt. Express 21 12053
[51] [52] [53] Naderi S, Dajani I, Madden T, et al. 2013 Opt. Express 21 16111
[54] Wirth C, Schreiber T, Rekas M, et al. 2010 Proc. SPIE 7580 75801H-6
[55] [56] [57] Schmidt O, Rekas M, Wirth C, et al. 2011 Opt. Express 19 4421
[58] Eidam T, Hdrich S, Jansen F, et al. 2011 Opt. Express 19 8656
[59] [60] [61] Stutzki F, Jansen F, Eidamet T, et al. 2011 Opt. Lett. 36 689
[62] Jrgensen M M, Laurila M, Noordegraaf D, et al. 2013 Proc. SPIE 8601 86010U
[63] [64] Wirth C, Schmidt O, Tsybin I, et al. 2011 Opt. Lett. 36 3118
[65] [66] [67] Jocher C, Eidama T, Hdricha S, et al. 2013 Proc. SPIE 8601 86011F
[68] Karow M, Tnnermann H, Neumann J, et al. 2012 Opt. Lett. 37 4242
[69]
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