Theoretical study on radiation effect on threshold of transverse mode instability of Yb-doped fiber amplifiers

Cao Jian-Qiu; Zhou Shang-De; Liu Peng-Fei; Huang Zhi-He; Wang Ze-Feng; Si Lei; Chen Jin-Bao

doi:10.7498/aps.73.20240816

Abstract

Yb-doped fiber amplifiers and their applications in radiation environments have become more and more attractive in recent years. However, the radiation effect will cause damage to the Yb-doped fibers, which can give negative effect on the output properties of Yb-doped fiber amplifiers. In this work, the influence of radiation effect on the transverse mode instability (TMI) of Yb-doped fiber amplifier is studied. TMI can couple the single light from the fundamental mode to high-order mode, thereby degenerating the beam quality of fiber amplifier. TMI is considered a key limitation of power up-scaling of fiber amplifiers.In this work, the radiation effect on the TMI is studied theoretically, and a formula of TMI threshold is presented by taking the radiation-induced attenuation (RIA), the most important radiation effect for the TMI, into account. The formula is deduced by introducing the loss of signal light induced by RIA into the formerly reported TMI-threshold formula which can be obtained by the linear stability analysis of the numerical model studying the TMI. Then, the relationship between the TMI and radiation dose is also given with the help of Power-Law describing the relationship between the RIA and radiation dose.With the formula, the variations of TMI threshold with the radiation dose and RIA are studied. It is found, as expected, that the TMI threshold decreases monotonically with the increase of RIA or radiation dose. Nevertheless, it is unexpectedly found that, to some extent, the gain coefficient of fiber amplifiers will also affect the radiation effect on TMI threshold. The results reveal that the increase of gain coefficient will lower the sensitivity of TMI threshold to the radiation dose. However, it is also implied that the gain coefficient cannot be too large because it can also make the TMI threshold lowered. Therefore, in order to maintain a high TMI threshold in a radiation environment, sufficient radiation resistance of Yb-doped fiber is essential.Because the RIA can affect not only the TMI threshold but also the output power or efficiency of Yb-doped fiber amplifier, the comparison between two effects of RIA is also discussed. It is found that the threshold of TMI is more sensitive to the radiation than to the output power or efficiency (see the figure attached below), which means that the TMI can exist in the irradiated Yb-doped fiber amplifier, although the output power is reduced because of RIA. This result can be verified by the experimental observation reported formerly. As a result, TMI can become a key limitation to the output power of Yb-doped fiber amplifier in radiation environments. The relevant results can provide significant guidance for the applications of Yb-doped fiber amplifiers in radiation environments.

Keywords:

Authors and contacts

1.
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
2.
Nanhu Laser Laboratory, National University of Defense Technology, Changsha 410073, China
3.
Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha 410073, China

Corresponding author: Chen Jin-Bao, kdchenjinbao@aliyun.com

Funds: Project supported by the National Natural Science Foundation of China (Grant No. U20B2058).

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References

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Cited By

图 1 归一化TMI阈值随辐射剂量D、系数C₁和f的变化, 泵浦光和信号光波长分别为976 nm和1080 nm, 增益系数g_sat为2 dB/m, f取值分别为0.5 (a), 0.7 (b), 0.9 (c), 1.1 (d)

Figure 1. Variation of normalized TMI threshold with radiation dose D, coefficients C₁ and f, the pump wavelength and signal wavelength are 976 nm and 1080 nm, respectively, and the gain coefficient g_sat is 2 dB/m. The value of coefficient f are 0.5 (a), 0.7 (b), 0.9 (c), and 1.1 (d), respectively.

DownLoad: Full-Size Img PowerPoint

图 2 归一化TMI阈值随辐射剂量D、系数C₁和f的变化, 泵浦光和信号光波长分别为976 nm和1080 nm, 系数f为0.7, 增益系数取值分别为1 dB/m (a), 3 dB/m (b), 5 dB/m (c), 10 dB/m (d)

Figure 2. Variation of normalized TMI threshold with radiation dose D, coefficients C₁ and f. The pump wavelength and signal wavelength are 976 nm and 1080 nm respectively, and the coefficient f is 0.7. The value of gain coefficient are 1 dB/m (a), 3 dB/m (b), 5 dB/m (c), and 10 dB/m (d), respectively.

DownLoad: Full-Size Img PowerPoint

图 3 不同增益系数对应的TMI阈值随D的变化　(a) C₁ = 0.002, f = 0.5; (b)C₁ =0.012, f = 0.9, 纤芯直径为30 μm

Figure 3. Variation of TMI threshold with D corresponding to various gain coefficient: (a) C₁ = 0.002, f = 0.5; (b) C₁ = 0.012, f = 0.9, the core diameter is 30 μm.

DownLoad: Full-Size Img PowerPoint

图 4 归一化TMI阈值(实线、虚线和点划线)及输出功率比值(空心圆点)随辐致损耗的变化　(a)光纤长度为20 m; (b)光纤长度为10 m

Figure 4. Variation of normalized TMI threshold (solid, dashed, and dotted) and output power ratio (hollow dots) with RIA: (a) Yb-doped fiber length is 20 m; (b) Yb-doped fiber length is 10 m.

DownLoad: Full-Size Img PowerPoint

图 5 TMI阈值与输出功率随辐致损耗的变化

Figure 5. Variation of TMI threshold and output power with RIA.

DownLoad: Full-Size Img PowerPoint

DownLoad: Full-Size Img PowerPoint

[1]	Girard S, Kuhnhenn J, Gusarov A, Brichard B, Uffelen M V, Ouerdane Y, Boukenter A, Marcandella C 2013 IEEE Trans. Nucl. Sci. 60 2015 Google Scholar
[2]	Girard S, Morana A, Ladaci A, Robin T, Mescia L, Bonnefois J J, Boutillier M, Mekki J, Paveau A, Cadier B, Marin E, Ouerdane Y, Boukenter A 2018 J. Optics-UK 20 093001 Google Scholar
[3]	Henschel H, Kohn O, Schmidt H U, Kirchof J, Unger S 1998 IEEE Trans. Nucl. Sci. 45 1552 Google Scholar
[4]	Rose T S, Gunn D, Valley G C 2001 J. Lightw. Technol. 19 1918 Google Scholar
[5]	Faustov A V, Gusarov A, Wuilpart M, Fotiadi A A, Liokumovich L B, Zolotovskiy I O, Tomashuk A L, Schoutheete T D, Mégret P 2013 IEEE Trans. Nucl. Sci. 60 2511 Google Scholar
[6]	Ma J, Li M, Tan L Y, Zhou Y P, Yu S Y, Ran Q W 2009 Opt. Express 17 15571 Google Scholar
[7]	Girard S, Ouerdane Y, Tortech B, Marcandella C, Robin T, Cadier B, Baggio J, Paillet P, Ferlet-Cavrois V, Boukenter A, Meunier J P, Schwank J R, Shaneyfelt M R, Dodd P E, Blackmore E W 2009 IEEE Trans. Nucl. Sci. 56 3293 Google Scholar
[8]	Fox B P, Simmons-Potter K, Thomes W J, Kliner D A V 2010 IEEE Trans. Nucl. Sci. 57 1618 Google Scholar
[9]	Duchez J B, Mady F, Mebrouk Y, Ollier N, Benabdesselam M 2014 Opt. Lett. 39 5969 Google Scholar
[10]	Xing Y B, Zhao N, Liao L, Wang Y B, Li H Q, Peng J G, Yang L Y, Dai N L, Li J Y 2015 Opt. Express 23 24236 Google Scholar
[11]	Chen Y S, Xu H Z, Xing Y B, Liao L, Wang Y B, Zhang F F, He X L, Li H Q, Peng J G, Yang L Y, Dai N L, Li J Y 2018 Opt. Express 26 20430 Google Scholar
[12]	Tao M M, Chen H W, Feng G B, Luan K P, Wang F, Huang K, Ye X S 2020 Opt. Express 28 10104 Google Scholar
[13]	Tan S, Li Y, Zhang H S, Wang X W, Jin J 2022 Chin. Phys. B 31 064211 Google Scholar
[14]	Shao C Y, Ren J J, Wang F, Ollier N, Xie F H, Zhang X Y, Zhang L, Yu C L, Hu L L 2018 J. Phys. Chem. B 122 2809 Google Scholar
[15]	Kher S, Chaubey S, Oak S M, Gusarov A 2013 IEEE Photonic. Technol. Lett. 25 2070 Google Scholar
[16]	Fernandez A F, Brichard B, Berghmans F 2003 IEEE Photonic. Technol. Lett. 15 1428 Google Scholar
[17]	Eidam T, Wirth C, Jauregui C, Stutzki F, Jansen F, Otto H-J, Schmidt O, Schreiber T, Limpert J, Tünnermann A 2011 Opt. Express 19 13218 Google Scholar
[18]	Beier F, Möller F, Sattler B, Nold J, Liem A, Hupel C, Kuhn S, Hein S, Haarlammert N, Schreiber T, Eberhardt R, Tünnermann A 2018 Opt. Lett. 43 1291 Google Scholar
[19]	Dong L 2013 Opt. Express 21 2642 Google Scholar
[20]	Tao R M, Wang X L, Zhou P 2018 IEEE J. Sel. Topics in Quant. Elect. 24 0903319 Google Scholar
[21]	Dong L 2022 J. Lightw. Technol. 40 4795 Google Scholar
[22]	Xia N, Yoo S 2020 J. Lightw. Technol. 38 4478 Google Scholar
[23]	Zervas M N 2017 Proc. of SPIE 10083 100830M Google Scholar
[24]	Zervas M N 2018 APL Photonic. 4 022802 Google Scholar
[25]	Zervas M N 2019 Opt. Express 27 19019 Google Scholar
[26]	Dong L, Ballato J, Kolis J 2023 Opt. Express 31 6690 Google Scholar
[27]	Cao J Q, Chen M N, Huang Z H, Wang Z F, Chen J B 2024 Opt. Express 32 12892 Google Scholar
[28]	Kelson I, Hardy A A 1998 IEEE J. Quant. Elect. 34 1570 Google Scholar
[29]	Jiang Z, Marciante J R 2008 J. Opt. Soc. Am. B 25 247 Google Scholar
[30]	Richardson D J, Nilsson J, Clarkson W A 2010 J. Opt. Soc. Am. B 27 B63 Google Scholar
[31]	Snyder A W, Love J D 1983 Optical Waveguide Theory (London: Chapman and Hall) pp254-255
[32]	Huang Z M, Shu Q, Luo Y, Tao R M, Feng X, Liu Y, Lin H H, Wang J J, Jing F 2021 J. Opt. Soc. Am. B 38 2945 Google Scholar
[33]	Lezius M, Predehl K, Stower W, Turler A, Greiter M, Hoeschen C, Thirolf P, Assmann W, Habs D, Prokofiev A, Ekstrom C, Hansch T W, Holzwarth R 2012 IEEE Trans. Nucl. Sci. 59 425 Google Scholar
[34]	黄宏琪, 赵楠, 陈瑰, 廖雷, 刘自军, 彭景刚, 戴能利 2014 物理学报 63 200201 Huang H Q, Zhao N, Chen G, Liao L, Liu Z J, Peng J G, Dai N L 2014 Acta Phys. Sin. 63 200201
[35]	Fox B P, Schneider Z V, Simmons-Potter K, Thomes W J, Meister D C, Bambha R P, Kliner D A V 2008 IEEE J. Quant. Elect. 44 581 Google Scholar
[36]	Fox B P, Simmons-Potter K, Thomes W J, Meister D C, Bambha R P, Kliner D A V 2008 Proc. of SPIE 7095 70950B
[37]	Hecht J 2009 Laser Focus World 45 53
[38]	Wang Y S, Peng W J, Liu H, Yang X B, Yu H M, Wang Y, Wang J, Feng Y J, Sun Y H, Ma Y, Gao Q S, Tang C 2023 Opt. Lett. 48 2909 Google Scholar

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