近1 μm波段可调谐光纤光源的研究进展 -

姓名
邮箱
手机号码
标题
留言内容
验证码

近1 μm波段可调谐光纤光源的研究进展

doi:10.37188/CO.2021-0125

党文佳^1,,
高奇^{2, 3,},
李哲^{2, 3,,},
李刚^{2, 3,,}

1.
西安航空学院理学院，陕西西安 710077
2.
中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室，陕西西安 710119
3.
中国科学院大学，北京 100049

基金项目:国家重点研发计划项目（No. 2017YFB1104400）

详细信息

作者简介:
党文佳（1983—），女，陕西西安人，博士，讲师，2015年于西安电子科技大学获得工学博士学位，主要从事光外差探测、光纤器及光电子技术等方面的研究。E-mail：wenjia_dang@126.com
高　奇（1988—），男，陕西渭南人，硕士，助理研究员，2014年于西安电子科技大学获得硕士学位，主要从事大功率光纤器、窄线宽光纤器等方面的研究。E-mail：gaoqi@opt.ac.cn
李　哲（1989—），男，山东菏泽人，硕士，助理研究员，2015年于西安电子科技大学获得硕士学位，主要从事光纤器、超荧光光纤光源、随机光纤器等新型光纤光源等方面的研究。E-mail：lizhe@opt.ac.cn
李　刚（1985—），男，陕西兴平人，硕士，助理研究员，2013年于中国科学院大学获得硕士学位，主要从事大功率光纤器、非线性光纤光学等方面的研究。E-mail：ligang85@opt.ac.cn

中图分类号:TN248
计量
- 文章访问数:1403
- HTML全文浏览量:521
- PDF下载量:216
- 被引次数:0
出版历程
- 收稿日期:2021-06-10
- 修回日期:2021-07-13
- 网络出版日期:2021-08-19
- 刊出日期:2021-09-18

Research progress of tunable fiber light sources with wavelength near 1 μm

DANG Wen-jia^1,,
GAO Qi^{2, 3,},
LI Zhe^{2, 3,,},
LI Gang^{2, 3,,}

1.
School of Science, Xi’an Aeronautical University, Xi’an 710077, China
2.
State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China

Funds:Supported by National Key R& D Program of China (No. 2017YFB1104400).

More Information

Corresponding author:lizhe@opt.ac.cn;ligang85@opt.ac.cn

摘要

摘要:近1 μm波段的可调谐光纤光源在光纤传感、冷却、光化学、光谱学以及医疗等领域具有广泛应用，近年来成为光纤光源领域的一个研究热点。本文首先系统回顾了能够实现波长调谐的4类光纤光源的发展历程，然后分析了它们存在的问题及可能的解决思路，最后对近1 μm波段可调谐光纤光源进行了总结和展望。
- 波长可调谐/
- 光纤器/
- 拉曼光纤器/
- 随机光纤器/
- 超荧光光纤光源
Abstract:Tunable fiber light sources with wavelength near 1 μm are widely used in optical fiber sensing, laser cooling, photochemical, spectroscopy and medical fields. They have thus become an area of focus in fiber light source research in recent years. The development history of fiber light sources with wavelength tuning ability is firstly summarized systematically. Then, their problems and possible solutions are analyzed. Finally, the future developments of tunable fiber light sources near 1 μm are prospected.
- tunable wavelength/
- fiber laser/
- raman fiber laser/
- random fiber laser/
- superfluorescent fiber source

HTML全文

图 1(a)可调谐光纤器的结构图；(b)不同波长的最大输出功率^[11]

Figure 1.(a) Experimental setup of the tunable fiber laser; (b) maximum output power at different wavelengths^[11]

下载: 全尺寸图片幻灯片

图 2(a)可调谐光纤系统结构示意图；(b)不同波长的输出功率^[14]

Figure 2.(a) Structural diagram of the tunable fiber laser; (b) output powers at different wavelengths^[14]

下载: 全尺寸图片幻灯片

图 3(a)可调谐光纤器的结构图；(b)主放大器的输出功率；(c)主放大器的输出光谱^[23]

Figure 3.(a) Structural diagram of the tunable fiber laser; (b) output power in the main amplifier; (c) spectra of the lasers from the main amplifier^[23]

下载: 全尺寸图片幻灯片

图 4(a)可调谐泵浦源的输出光谱；(b)可调谐拉曼光输出光谱^[37]

Figure 4.(a) Output spectra of the tunable pump source; (b) output spectra of the tunable Raman laser^[37]

下载: 全尺寸图片幻灯片

图 5(a)可调谐随机光纤器结构图；(b)1~1.9 μm的输出光谱^[44]

Figure 5.The configuration of the tunable fiber laser; (b) output spectra plotted from 1 to 1.9 μm^[44]

下载: 全尺寸图片幻灯片

图 6(a)系统结构图；(b)不同波长的输出功率及效率；(c)最大功率时的输出光谱^[56]

Figure 6.(a) Experimental setup; (b) output power and slope efficiency at different wavelengths; (c) output spectra at the maximum output power^[56]

下载: 全尺寸图片幻灯片

表 1可调谐掺镱光纤器的研究进展

Table 1.Research progress of tunable ytterbium-doped fiber lasers

年份	研究单位	系统结构	调谐范围/nm	最大功率	线宽
2001	法国鲁昂大学	基于TBPF的全光纤结构环形腔	1040~1100	800 mW	~0.1 nm
2002	德国汉诺威中心	基于HDG的空间结构环形腔	1032~1124	10 W	<2.5 GHz
2004	南开大学	基于可调FBG的线形腔	1046.6~1062.2	117 mW	<0.1 nm
2005	中国科学技术大学	DBR 器	1036.1~1056.5	4 mW	<8 MHz
2005	墨西哥光学研究中心	基于多模干涉效应的线形腔	1088~1097	500 mW	0.5 nm
2007	德国汉诺威中心	基于Littman-Littrow结构的环形腔	1017~1043	31 mW	5 MHz
2007	南开大学	基于闪耀光栅的线形腔	1042.1~1093	2.21 W	<0.08 nm
2007	瑞典皇家理工学院	基于体布拉格光栅的线形腔	1022~1055	4.3 W	5 GHz
2007	德国汉诺威中心	线形腔、MOPA结构	1040~1085	133 W	——
2008	厦门大学	基于Littman-Littrow结构的线形腔	1046~1121	>20 W	0.5 nm
2011	清华大学	被动多环形腔结构	1020~1080	100 mW	单纵模
2011	英国布里斯托大学	基于AOTF的空间结构环形腔	1035~1105	10 W	——
2013	法国波尔多大学	基于AOTF的空间结构环形腔	976~1120	41 W	0.1~1 nm
2013	瑞典皇家理工学院	基于布拉格光栅的线形腔	1064~1073	>100 W	13 GHz
2014	中科院上光所	基于TBPF的全光纤环形腔	1010~1090	39.9 W	——
2016	美国IPG公司	MOPA结构	1030~1070	>1.5 kW	——
2017	国防科技大学	MOPA结构	1065~1090	>1 kW	0.12 nm
2019	西北大学	复合腔结构	1030~1090	18.5 mW	8.7 kHz
2019	印度科学研究所	环形腔、MOPA结构	1050~1100	130 W	0.4~1 nm
2020	清华大学	环形腔、MOPA结构、同带泵浦	1060~1090	>1 kW	0.1 nm

下载: 导出CSV

表 2可调谐拉曼光纤器的研究进展

Table 2.Research progress of tunable Raman fiber lasers

年份	研究单位	系统结构	调谐范围/nm	最大功率
1977	美国贝尔实验室	基于衍射光栅的TRFL	一阶1085~1130 二阶1150~1175	——
2005	德国汉堡-哈尔堡工业大学	Sagnac-loop结构的全光纤级联TRFL	1110~1230	700 mW
2007	俄罗斯科学院	基于可调谐泵浦源、可调谐FBG的TRFL	1250~1300	3.2 W
2008	加拿大拉瓦尔大学	基于可调谐FBG的TRFL	1075~1135	5 W
2010	法国里尔大学	基于可调谐泵浦源的TRFL	1240~1289	2.5 W
2012	德国弗劳恩霍夫应用光学与精密研究所	MOPA结构的TRFL	1118~1130	208 W
2018	国防科技大学	基于可调谐泵浦源的TRFL	1112~1139.6	125.3 W

下载: 导出CSV

表 3可调谐随机光纤器的研究进展

Table 3.Research progress of tunable random fiber lasers

年份	研究单位	系统结构	调谐范围/nm	最大功率
2015	国防科技大学	基于手动调节的TBPF的可调谐RFL	1040~1090	——
2016	上海光学精密机械研究所	基于可调谐泵浦源与高阶拉曼激射的可调谐RFL	1070~1370	1.8 W
2017	上海光学精密机械研究所	基于可调谐泵浦源与高阶拉曼激射的可调谐RFL	1000~1940	——
2018	国防科技大学	基于TBPF的可调谐RFL	1095~1115	23 W
2018	国防科技大学	基于可调谐泵浦源与半开腔结构的可调谐RFL	1113.76~1137.44	>100 W
2019	印度科学研究所	基于可变截止短通滤波反馈结构的可调谐RFL	1118~1575	33 W

下载: 导出CSV

表 4可调谐超荧光光纤光源的研究进展

Table 4.Research progress of tunable superfluorescent fiber sources

年份	研究单位	系统结构	调谐范围/nm	最大功率
2009	英国南安普顿大学	基于衍射光栅的空间结构可调谐SFS	1034~1084	135 mW
2018	西安光学精密机械研究所	基于TBPF的可调谐SFS	1045~1080	30 W
2020	西安光学精密机械研究所	基于衍射光栅的空间结构可调谐SFS	1052.4~1072.8	>230 W
2020	西安光学精密机械研究所	基于衍射光栅的空间结构可调谐SFS	1035~1055	>300 W
2020	西安光学精密机械研究所	基于TBPF的可调谐SFS	1045~1085	~1000 W

下载: 导出CSV

参考文献 (57)

[1]	NILSSON J, CLARKSON W A, SELVAS R,et al. High-power wavelength-tunable cladding-pumped rare-earth-doped silica fiber lasers[J].Optical Fiber Technology, 2004, 10(1): 5-30.doi:10.1016/j.yofte.2003.07.001
[2]	KOESTER C J, SNITZER E. Amplification in a fiber laser[J].Applied Optics, 1964, 3(10): 1182-1186.doi:10.1364/AO.3.001182
[3]	JAUREGUI C, LIMPERT J, TÜNNERMANN A. High-power fibre lasers[J].Nature Photonics, 2013, 7(11): 861-867.doi:10.1038/nphoton.2013.273
[4]	党文佳, 李哲, 李玉婷, 等. 高功率连续波掺镱光纤器研究进展[J]. 中国光学,2020,13(4):676-694.doi:10.37188/CO.2019-0208 DANG W J, LI ZH, LI Y T,et al. Recent advances in high-power continuous-wave ytterbium-doped fiber lasers[J].Chinese Optics, 2020, 13(4): 676-694. (in Chinese)doi:10.37188/CO.2019-0208
[5]	ZERVAS M N. High power ytterbium-doped fiber lasers—fundamentals and applications[J].International Journal of Modern Physics B, 2014, 28(12): 1442009.doi:10.1142/S0217979214420090
[6]	TER-MIKIRTYCHEV V.Fundamentals of Fiber Lasers and Fiber Amplifiers[M]. New York: Springer, 2014.
[7]	韩辉云. 可调谐掺镱光纤器理论和实验研究[D]. 石家庄: 河北师范大学, 2019 HAN H Y. Theoretical and experimental study on tunable ytterbium-doped fiber laser[D]. Shijiazhuang: Hebei Normal University, 2019. (in Chinese)
[8]	HIDEUR A, CHARTIER T, Ö ZKUL C,et al. All-fiber tunable ytterbium-doped double-clad fiber ring laser[J].Optics Letters, 2001, 26(14): 1054-1056.doi:10.1364/OL.26.001054
[9]	AUERBACH M, ADEL P, WANDT D,et al. 10 W widely tunable narrow linewidth double-clad fiber ring laser[J].Optics Express, 2002, 10(2): 139-144.doi:10.1364/OE.10.000139
[10]	SILVA A, BOLLER K J, LINDSAY I D. Wavelength-swept Yb-fiber master-oscillator-power-amplifier with 70 nm rapid tuning range[J].Optics Express, 2011, 19(11): 10511-10517.doi:10.1364/OE.19.010511
[11]	ROYON R, LHERMITE J, SARGER L,et al. High power, continuous-wave ytterbium-doped fiber laser tunable from 976 to 1120 nm[J].Optics Express, 2013, 21(11): 13818-13823.doi:10.1364/OE.21.013818
[12]	HU J M, ZHANG L, FENG Y. Widely tunable Yb-doped all-fiber laser from 1.0 to 1.1 μm[C].Advanced Solid State Lasers 2014, Optical Society of America, 2014: AM5A.22.
[13]	BALASWAMY V, APARANJI S, CHAYRAN G,et al. High-power, independently wavelength, power, and linewidth tunable ytterbium fiber laser[J].IEEE Photonics Technology Letters, 2019, 31(8): 583-586.doi:10.1109/LPT.2019.2901504
[14]	TIAN J D, XIAO Q R, LI D,et al. Tandem-pumped high-power narrow-linewidth fiber laser tunable from 1060–1090 nm[J].Journal of Lightwave Technology, 2020, 38(6): 1461-1467.doi:10.1109/JLT.2019.2954536
[15]	FU SH G, FAN W D, ZHANG Q,et al. Tunable Yb-doped double-clad fibre laser based on fibre Bragg grating with narrow linewidth[J].Chinese Physics Letters, 2004, 21(7): 1279-1281.doi:10.1088/0256-307X/21/7/026
[16]	SELVAS R, TORRES-GOMEZ I, MARTINEZ-RIOS A,et al. Wavelength tuning of fiber lasers using multimode interference effects[J].Optics Express, 2005, 13(23): 9439-9445.doi:10.1364/OPEX.13.009439
[17]	刘胜利, 李乙钢, 高艳丽, 等. 高功率宽调谐范围掺Yb³⁺光子晶体光纤器 [J]. 光学学报,2007,27(9):1663-1667.doi:10.3321/j.issn:0253-2239.2007.09.024 LIU SH L, LI Y G, GAO Y L,et al. High-power widely tunable Yb-doped photonic crystal fiber laser[J].Acta Optica Sinica, 2007, 27(9): 1663-1667. (in Chinese)doi:10.3321/j.issn:0253-2239.2007.09.024
[18]	HILDEBRANDT M, FREDE M, KRACHT D. Narrow-linewidth ytterbium-doped fiber amplifier system with 45 nm tuning range and 133 W of output power[J].Optics Letters, 2007, 32(16): 2345-2347.doi:10.1364/OL.32.002345
[19]	JELGER P, LAURELL F. Efficient skew-angle cladding-pumped tunable narrow-linewidth Yb-doped fiber laser[J].Optics Letters, 2007, 32(24): 3501-3503.doi:10.1364/OL.32.003501
[20]	ZEIL P, PASISKEVICIUS V, LAURELL F. Efficient spectral control and tuning of a high-power narrow-linewidth Yb-doped fiber laser using a transversely chirped volume Bragg grating[J].Optics Express, 2013, 21(4): 4027-4035.doi:10.1364/OE.21.004027
[21]	FAN Y Y, YE CH CH, WU C Y,et al. High-power narrow-linewidth wavelength-tunable Yb³⁺-doped double-clad fiber lasers[J].Proceedings of SPIE, 2008, 7134: 71342H.doi:10.1117/12.803303
[22]	YAGODKIN R, PLATONOV N, YUSIM A,et al. > 1.5kW narrow linewidth CW diffraction-limited fiber amplifier with 40nm bandwidth[J].Proceedings of SPIE, 2016, 9728: 972807.
[23]	LIU Y K, SU R T, MA P F,et al. > 1 kW all-fiberized narrow-linewidth polarization-maintained fiber amplifiers with wavelength spanning from 1065 to 1090 nm[J].Applied Optics, 2017, 56(14): 4213-4218.doi:10.1364/AO.56.004213
[24]	王安廷, 李锋, 黄晶, 等. 可调谐单频掺镱光纤DBR 器[J]. 量子电子学报,2005,22(4):607-611.doi:10.3969/j.issn.1007-5461.2005.04.024 WANG A T, LI F, HUANG J,et al. Tunable single-frequency ytterbium-doped fiber BDR laser[J].Chinese Journal of Quantum Electronics, 2005, 22(4): 607-611. (in Chinese)doi:10.3969/j.issn.1007-5461.2005.04.024
[25]	ENGELBRECHT M, RUEHL A, WANDT D,et al. Single-frequency ytterbium-doped fiber laser with 26 nm tuning range[J].Optics Express, 2007, 15(8): 4617-4622.doi:10.1364/OE.15.004617
[26]	YIN F F, YANG S G, CHEN H W,et al. 60-nm-wide tunable single-longitudinal-mode ytterbium fiber laser with passive multiple-ring cavity[J].IEEE Photonics Technology Letters, 2011, 23(22): 1658-1660.doi:10.1109/LPT.2011.2166112
[27]	WANG K L, LU B L, QI X Y,et al. Wavelength-tunable single-frequency ytterbium-doped fiber laser based on a double-circulator interferometer[J].Laser Physics Letters, 2019, 16(1): 015104.doi:10.1088/1612-202X/aaf175
[28]	马选选, 陆宝乐, 王凯乐, 等. 宽带可调谐单频窄线宽光纤器[J]. 光学学报,2019,39(1):0114001.doi:10.3788/AOS201939.0114001 MA X X, LU B L, WANG K L,et al. Tunable broadband single-frequency narrow-linewidth fiber laser[J].Acta Optica Sinica, 2019, 39(1): 0114001. (in Chinese)doi:10.3788/AOS201939.0114001
[29]	冯衍, 姜华卫, 张磊. 高功率拉曼光纤器技术研究进展[J]. 中国 ,2017,44(2):0201005.doi:10.3788/CJL201744.0201005 FENG Y, JIANG H W, ZHANG L. Advances in high power Raman fiber laser technology[J].Chinese Journal of Lasers, 2017, 44(2): 0201005. (in Chinese)doi:10.3788/CJL201744.0201005
[30]	LIN C, STOLEN R H, FRENCH W G,et al. A cw tunable near-infrared (1.085–1.175μm) Raman oscillator[J].Optics Letters, 1977, 1(3): 96-97.doi:10.1364/OL.1.000096
[31]	CIERULLIES S, LIM E L, BRINKMEYER E. Ad-fiber widely tunable Raman laser in a combined linear and sagnac-loop configuration[C].OFC/NFOEC Technical Digest.Optical Fiber Communication Conference,2005, IEEE, 2005: 31-33.
[32]	BABIN S A, KABLUKOV S I, VLASOV A A. Tunable fiber Bragg gratings for application in tunable fiber lasers[J].Laser Physics, 2007, 17(11): 1323-1326.doi:10.1134/S1054660X07110096
[33]	BELANGER E, BERNIER M, FAUCHER D,et al. High-power and widely tunable all-fiber Raman laser[J].Journal of Lightwave Technology, 2008, 26(12): 1696-1701.doi:10.1109/JLT.2008.922337
[34]	ANQUEZ F, COURTADE E, SIVÉRY A,et al. A high-power tunable Raman fiber ring laser for the investigation of singlet oxygen production from direct laser excitation around 1270 nm[J].Optics Express, 2010, 18(22): 22928-22936.doi:10.1364/OE.18.022928
[35]	REKAS M, SCHMIDT O, ZIMER H,et al. Over 200 W average power tunable Raman amplifier based on fused silica step index fiber[J].Applied Physics B, 2012, 107(3): 711-716.doi:10.1007/s00340-012-5052-3
[36]	AGRAWAL G P. Nonlinear fiber optics: its history and recent progress [Invited][J].Journal of the Optical Society of America B, 2011, 28(12): A1-A10.doi:10.1364/JOSAB.28.0000A1
[37]	SONG J X, WU H SH, XU J M,et al. High-power linearly-polarized tunable Raman fiber laser[J].Chinese Physics B, 2018, 27(9): 094209.doi:10.1088/1674-1056/27/9/094209
[38]	TURITSYN S K, BABIN S A, CHURKIN D V,et al. Random distributed feedback fibre lasers[J].Physics Reports, 2014, 542(2): 133-193.doi:10.1016/j.physrep.2014.02.011
[39]	党文佳, 李哲, 卢娜, 等. 0.9~1.0 μm近红外连续光纤器的研究进展[J]. 中国光学,2021,14(2):264-274.doi:10.37188/CO.2020-0193 DANG W J, LI ZH, LU N,et al. Research progress of 0.9~1.0 μm near-infrared continuous-wave fiber lasers[J].Chinese Optics, 2021, 14(2): 264-274. (in Chinese)doi:10.37188/CO.2020-0193
[40]	DU X Y, ZHANG H W, WANG X L,et al. Tunable random distributed feedback fiber laser operating at 1 μm[J].Applied Optics, 2015, 54(4): 908-911.doi:10.1364/AO.54.000908
[41]	YE J, XU J M, SONG J X,et al. Flexible spectral manipulation property of a high power linearly polarized random fiber laser[J].Scientific Reports, 2018, 8(1): 2173.doi:10.1038/s41598-018-20664-y
[42]	WU H SH, SONG J X, YE J,et al. Hundred-watt-level linearly polarized tunable Raman random fiber laser[J].Chinese Optics Letters, 2018, 16(6): 061402.doi:10.3788/COL201816.061402
[43]	ZHANG L, JIANG H W, YANG X Z,et al. Ultra-wide wavelength tuning of a cascaded Raman random fiber laser[J].Optics Letters, 2016, 41(2): 215-218.doi:10.1364/OL.41.000215
[44]	ZHANG L, JIANG H W, YANG X Z,et al. Nearly-octave wavelength tuning of a continuous wave fiber laser[J].Scientific Reports, 2017, 7: 42611.doi:10.1038/srep42611
[45]	ZHANG L, DONG J Y, FENG Y. High-power and high-order random Raman fiber lasers[J].IEEE Journal of Selected Topics in Quantum Electronics, 2018, 24(3): 1400106.
[46]	BALASWAMY V, APARANJI S, ARUN S,et al.. High power, ultra-widely tunable wavelength, cascaded Raman fiber laser[C].CLEO: Science and Innovations 2018, Optical Society of America, 2018: SM1K.4.
[47]	BALASWAMY V, RAMACHANDRAN S, SUPRADEEPA V R. High-power, cascaded random Raman fiber laser with near complete conversion over wide wavelength and power tuning[J].Optics Express, 2019, 27(7): 9725-9732.doi:10.1364/OE.27.009725
[48]	李乙钢, 刘伟伟, 傅成鹏, 等. 大功率掺Yb双包层光纤宽带超荧光光源[J]. 光学学报,2001,21(10):1171-1173.doi:10.3321/j.issn:0253-2239.2001.10.005 LI Y G, LIU W W, FU CH P,et al. High-power Yb-doped double-cladding fiber broadband superfluorescent source[J].Acta Optica Sinica, 2001, 21(10): 1171-1173. (in Chinese)doi:10.3321/j.issn:0253-2239.2001.10.005
[49]	WANG P, CLARKSON W A. Tunable Yb-doped fibre amplified spontaneous emission source[C].Conference on Lasers and Electro-Optics 2009, Optical Society of America, 2009: CFM6.
[50]	YE J, XU J M, ZHANG Y,et al. Spectrum-manipulable hundred-watt-level high-power superfluorescent fiber source[J].Journal of Lightwave Technology, 2019, 37(13): 3113-3118.doi:10.1109/JLT.2019.2911007
[51]	吴鹏. 高功率掺镱光纤超荧光光源技术研究[D]. 西安: 中国科学院大学(中国科学院西安光学精密机械研究所), 2019 WU P. Study on the technology of high-power Yb-doped superfluorescent fiber source[D]. Xi’an: University of Chinese Academy of Sciences (Xi’an Institute of Optics & Precision Mechanics, Chinese Academy of Sciences), 2019. (in Chinese)
[52]	WU P, ZHAO B Y, ZHAO W,et al. Optimization investigation for high-power 1034 nm all-fiber narrowband Yb-doped superfluorescent source[J].Optics Communications, 2019, 445: 187-192.doi:10.1016/j.optcom.2019.04.033
[53]	WU P, ZHAO B Y, ZHAO W,et al. 30 W all-fiber tunable, narrowband Yb-doped superfluorescent fiber source[J].Infrared Physics&Technology, 2018, 92: 363-366.
[54]	GAO W, FAN W H, ZHANG Y P,et al. High-power tunable sub-nm narrowband near-diffraction-limited superfluorescent fiber source based on a single-lens spectral filter[J].Optics Communications, 2020, 463: 125359.doi:10.1016/j.optcom.2020.125359
[55]	JU P, FAN W H, ZHAO B Y,et al. High power, tunable, ultra-narrowband Yb-doped superfluorescent fiber source operating at wavelength less than 1055 nm with 20 nm tuning range[J].Infrared Physics&Technology, 2020, 111: 103530.
[56]	LI ZH, LI G, GAO Q,et al. Kilowatt-level tunable all-fiber narrowband superfluorescent fiber source with 40 nm tuning range[J].Optics Express, 2020, 28(7): 10378-10385.doi:10.1364/OE.387405
[57]	ZHENG Y, YANG Y F, WANG J H,et al. 10.8 kW spectral beam combination of eight all-fiber superfluorescent sources and their dispersion compensation[J].Optics Express, 2016, 24(11): 12063-12071.doi:10.1364/OE.24.012063