Suppression effect of auxiliary laser on stimulated Raman scattering effect of high-power Yb-doped fiber laser amplifier

Zhao Wei; Fu Shi-Jie; Sheng Quan; Xue Kai; Shi Wei; Yao Jian-Quan

doi:10.7498/aps.73.20240895

Abstract

A novel technique to suppress the stimulated Raman scattering (SRS) effect in high-power ytterbium-doped fiber amplifier is proposed and theoretically investigated by introducing an auxiliary laser to manipulate the gain distribution in the amplifier.By injecting an auxiliary laser with shorter wavelength than the signal into the amplifier, the auxiliary laser, owing to its larger stimulated emission cross-section, initially extracts a significant portion of the laser gain. At this point, the gain of the longer-wavelength signal laser is suppressed to a certain extent. As the pump power is depleted in the rear segment of the gain fiber, the amplified auxiliary laser, which has larger absorption cross-section than the signal, is gradually absorbed by the active fiber and transfers its power to the signal laser. This process enhances the gain of the long-wavelength signal laser, enabling it to be rapidly amplified at the end of the amplifier. Compared with the amplification of the singular signal laser, the introduction of an extra auxiliary laser shifts the high-gain region of the signal laser to the rear portion of the amplifier, thereby reducing the effective length and alleviating the interaction strength between the signal laser and Stokes wave, in order to obtain a higher SRS threshold.The SRS threshold of a 20 μm/400 μm fiber amplifier is investigated by using numerical simulation under different wavelengths of the auxiliary laser and different power ratios of the signal laser to auxiliary laser. The results indicate that incorporating an auxiliary laser with an appropriate wavelength and power level can significantly reduce the interaction strength between the signal and Stokes wave, thereby enhancing the SRS threshold of the amplifier efficiently. Specifically, in a 1080 nm fiber amplifier utilizing a 20 μm/400 μm ytterbium-doped large mode area fiber, if the total power of the 1080 nm signal and 1040 nm auxiliary laser is set to 200 W, while with a power ratio of 1:25, the SRS threshold increasing from 3.14 kW (singular signal laser) to 8.42 kW can be anticipated. Moreover, based on the auxiliary laser amplification technique that suppresses the SRS effect, the output power enhancement of fiber lasers with the structure of master oscillator power amplifier (MOPA) is also analyzed. This technical solution is relatively straightforward to implement and can be seamlessly integrated with other techniques aimed at reducing the SRS effect, which is promising to promote further power scaling of all-fiber amplifier.

Keywords:

Authors and contacts

1.
School of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
2.
Key Laboratory of Optoelectronic Information Technology (Ministry of Education), Tianjin University, Tianjin 300072, China
3.
HFB Photonics Co., Ltd., Weihai 264200, China

Corresponding author: Fu Shi-Jie, shijie_fu@tju.edu.cn ; Shi Wei, shiwei@tju.edu.cn ;

Funds: Project supported by the National Key R&D Program of China (Grant No. 2022YFB3606000), the National Natural Science Foundation of China (Grant Nos. 62105240, 62275190, 62075159), the Key R&D Program of Shandong Province, China (Grants Nos. 2020CXGC010104, 2021CXGC010202), the Seed Foundation of Tianjin University, China (Grant No. 2023XPD-0020), the Open Foundation of Key Laboratory of Laser Devices and Technology of China North Industries Group Co., LTD (Grant No. QT23120019), and the Taishan Industry Leading Talent Project, China (Grant No. scx202312163).

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References

[1]	Jauregur C, Limpert J, Tünnermann A 2013 Nat. Photonics 7 861 Google Scholar
[2]	Richardson D J, Nilsson J, Clarkson W A 2010 J. Opt. Soc. Am. B: Opt. Phys. 27 B63 Google Scholar
[3]	Shi W, Fang Q, Zhu X, Norwood R A, Peyghambarian N 2014 Appl. Opt. 53 6554 Google Scholar
[4]	Zenteno L A, Wang J, Walton D T, Ruffin B A, Li M J 2005 Opt. Express 13 8921 Google Scholar
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Cited By

图 1 掺镱光纤放大器中激光功率分布. 未注入辅助光情况下(a)信号光、泵浦光和(b) Stokes光随光纤长度的功率演化特性; 1080 nm信号光与泵浦光功率固定不变, 额外注入200 W的1050 nm辅助光, (c) 信号光、辅助光、泵浦光和(d) Stokes光功率演化特性

Figure 1. Laser power distribution in ytterbium-doped fiber amplifier. Power evolution characteristics of (a) signal, pump and (b) Stokes wave as a function of fiber length without injection of auxiliary laser; power evolution characteristics of (c) signal light, auxiliary light, pump light and (d) Stokes light when the powers of 1080 nm signal and pump light are fixed, an additional 200 W auxiliary light at 1050 nm is injected.

DownLoad: Full-Size Img PowerPoint

图 2 辅助光波长为1050 nm时SRS效应阈值与信号/辅助光功率比的关系

Figure 2. SRS threshold as a function of signal and auxiliary laser power ratio when the auxiliary laser wavelength is 1050 nm.

DownLoad: Full-Size Img PowerPoint

图 3 不同信号/辅助光功率比下掺镱光纤放大器中激光功率分布　(a), (b) 2∶1; (c), (d) 1∶3; (e), (f) 1∶6

Figure 3. Laser power distribution in ytterbium-doped fiber amplifier with different signal/auxiliary laser power ratios: (a), (b) 2∶1; (c), (d) 1∶3; (e), (f) 1∶6.

DownLoad: Full-Size Img PowerPoint

图 4 SRS效应阈值与辅助光波长、功率占比的关系

Figure 4. SRS threshold as a function of auxiliary laser wavelength and power ratio with signal laser.

DownLoad: Full-Size Img PowerPoint

图 5 掺镱光纤放大器在不同光纤尺寸下功率输出极限, SRS: 受激拉曼散射效应; TMI: 模式不稳定效应; Pump: 泵浦亮度　(a) 未注入辅助光时功率输出极限; (b) 注入辅助光后功率输出极限

Figure 5. Power scaling limit of ytterbium-doped fiber amplifiers under different fiber size. SRS: stimulated Raman scattering, TMI: transverse mode instability, Pump: pump brightness: (a) Output limit without auxiliary laser injection; (b) output limit after auxiliary laser injection.

DownLoad: Full-Size Img PowerPoint

表 1 仿真参数

Table 1. Simulation parameters.

Parameter	Value	Parameter	Value
N₀/(10²⁵ m^–3)	5.2	σ_es2/(10^–25 m²)	4.8
λ_s1/nm	1080	λ_p/nm	976
λ_s2/nm	1050	g_R/(10^–13 m·W^–1)	0.53
λ_R1/nm	1132	α_s/m^–1	0.003
λ_R2/nm	1101	α_p/m^–1	0.005
σ_as1/(10^–27 m²)	2.3	α_R/m^–1	0.003
σ_es1/(10^–25 m²)	2.8	Δλ_R/nm	5^[17]
σ_as2/(10^–26 m²)	1.4	Δλ_s/nm	2^[17]

DownLoad: CSV

map

[1]	Jauregur C, Limpert J, Tünnermann A 2013 Nat. Photonics 7 861 Google Scholar
[2]	Richardson D J, Nilsson J, Clarkson W A 2010 J. Opt. Soc. Am. B: Opt. Phys. 27 B63 Google Scholar
[3]	Shi W, Fang Q, Zhu X, Norwood R A, Peyghambarian N 2014 Appl. Opt. 53 6554 Google Scholar
[4]	Zenteno L A, Wang J, Walton D T, Ruffin B A, Li M J 2005 Opt. Express 13 8921 Google Scholar
[5]	Kim J, Dupriez P, Codemard C, Codemard C, Nilsson J, Sahu J K 2006 Opt. Express 14 5103 Google Scholar
[6]	Nodop D, Jauregui C, Jansen F, Limpert, Tünnermann A 2010 Opt. Lett. 35 2982 Google Scholar
[7]	Wang M, Zhang Y J, Wang Z F, Sun J J, Cao J Q, Leng J Y, Gu X J, Xu X J 2017 Opt. Express 25 1529 Google Scholar
[8]	Hu Q H, Tian X, Zhao X F, Wang M, Xi X M, Wang Z F, Xu X J 2022 Opt Laser Technol. 150 107984 Google Scholar
[9]	李昊, 陈金宝, 叶新宇, 王崇伟, 王蒙, 武柏屹, 肖虎, 陈子伦, 王泽峰 2024 中国激光 51 0215001 Google Scholar Li H, Chen J B, Ye X Y, Wang C W, Wang M, Wu B Y, Xiao H, Chen Z L, Wang Z F 2024 Chin. J. Lasers 51 0215001 Google Scholar
[10]	李昊, 叶新宇, 王蒙, 武柏屹, 高晨晖, 陈子伦, 王泽锋, 陈金宝 2023 光学学报 43 1714007 Google Scholar Li H, Ye X Y, Wang M, Wu B Y, Gao C H, Chen Z L, Wang Z F, Chen J B 2023 Acta Opt. Sin. 43 1714007 Google Scholar
[11]	Jiao K R, Shen H, Guan Z W, Yang F Y, Zhu R H 2020 Opt. Express 28 6048 Google Scholar
[12]	Liu W, Ma P F, Lv H B, Xu J G, Zhou P, Jiang Z F 2016 Opt. Express 24 26715 Google Scholar
[13]	Li T L, Ke W W, Ma Y, S Y H, Gao Q S 2019 J. Opt. Soc. Am. B: Opt. Phys. 36 1457 Google Scholar
[14]	孟祥明, 杨保来, 奚小明, 王鹏, 史尘, 张汉伟, 王小林 2023 光学学报 43 1714001 Google Scholar Meng X M, Yang B L, Xi X M, Wang P, Shi C, Zhang H W, Wang X L 2023 Acta Opt Sin 43 1714001 Google Scholar
[15]	张春, 谢亮华, 楚秋慧, 刘玙, 黄珊, 宋华青, 吴文杰, 冯曦, 李敏, 沈本剑, 李昊坤, 陶汝茂, 许立新, 王建军 2022 强激光与粒子束 34 126 Google Scholar Zhang C, Xie L H, Chu Q H, Liu Y, Huang S, Song H Q, Wu W J, Feng X, Li M, Shen B J, Li H K, Tao R M, Xu L X, Wang J J 2022 High Power Laser Part. Beams 34 126 Google Scholar
[16]	Jauregui C, Limpert J, Tünnermann A 2009 Opt. Express 17 8476 Google Scholar
[17]	Zheng J k, Zhao W, Zhao B Y, Li Z, Li G, Gao Q, Ju P, Gao W, She S F, Wu P 2018 Laser Phys. 28 105105 Google Scholar
[18]	Ying H Y, Cao J Q, Yu Y, Wang M, Wang Z F, Chen J B 2017 Optik 144 163 Google Scholar
[19]	罗亿, 王小林, 张汉伟, 粟荣涛, 马鹏飞, 周朴, 姜宗福 2017 66 234206 Google Scholar Luo Y, Wang X L, Zhang H W, Su R T, Ma P F, Zhou P, Jiang Z F 2017 Acta Physica. Sin. 66 234206 Google Scholar
[20]	Lu Y, Han Z G, Shen H, Yan M J, Shen H, Zhu R H 2019 Proceeding of the 14th National Conference on Laser Technology and Optoelectronics Shanghai, China, March 17–20, 2019 p11170
[21]	Dawson J W, Messerly M J, Beach R J, Shverdin M Y, Stappaerts E A, Sridharan A K, Pax H P, Heebner J E, Sider C W, Barty C P J 2008 Opt. Express 16 13240 Google Scholar
[22]	Zhu J J, Zhou P, Ma Y X, Xu X J, Liu Z J 2011 Opt. Express 19 18645 Google Scholar
[23]	Zervas M N 2019 Opt. Express 13 19019 Google Scholar
[24]	Dong L, Ballato J, Kolis J 2023 Opt. Express 27 6690 Google Scholar

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