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本文采用双包层掺镱光纤作为增益介质, 用单壁碳纳米管作为饱和吸收体, 获得最高输出功率为336 mW的锁模脉冲激光. 用飞秒激光诱导水击穿法直接在单模光纤上制备出D形区, 通过在D形光纤上滴涂单壁碳纳米管溶液, 成功制备出碳纳米管饱和吸收体, 并对其饱和吸收特性进行测试, 发现其调制深度为27%. 利用该饱和吸收体作为锁模器件,制备出具有环形腔结构的锁模光纤激光器. 当抽运功率为4 W时, 获得了脉宽为93.8 fs, 中心波长为1083.8 nm, 3 dB谱宽为8.6 nm, 重复频率为5.59 MHz, 平均功率为336 mW的飞秒脉冲激光输出.In this paper, the mode-locked laser pulse with a maximum power of 366 mW is achieved by using Yb-ions-doped double-clad fiber as the gain medium and single-walled carbon nanotubes (SWCNTs) as the saturable absorber (SA). The saturable absorber with a modulation depth of 27% is fabricated by spreading the well-dispersed SWCNTs on the D-shaped segment of the fiber, which is directly etched on the standard single-mode fiber by water-assisted femtosecond laser ablation. The ring-cavity structure fiber laser is fabricated based on the SWCNT-SA. The mode-locked pulse width of 93.8 fs, central wavelength of 1083.8 nm, and 3 dB bandwith of 8.6 nm at the repetition rate of 5.59 MHz are obtained in the optimized polarization state under a pump power of 4 W.
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Keywords:
- double-clad fiber lasers /
- passive mode locking /
- single-walled carbon nanotube saturable absorber /
- D-shaped fiber
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[1] Nishizawa N, Seno Y, Sumimura K 2008 Opt. Express 16 13
[2] Keller U 2003 Nature 424 6950
[3] Lin H H, Lu Z H, Wang J J, Zhang Y, Wang F R, Xu D P, Zhang R, Li M Z, Deng Q H, Luo Y M, Tang J, Ding L 2008 Acta Phys. Sin. 57 5646 (in Chinese) [林宏奂, 卢振华, 王建军, 张颖, 王凤蕊, 许党朋, 张锐, 李明中, 邓青华, 罗意鸣, 唐军, 丁磊 2008 57 5646]
[4] Yang L Z, Chen G F, Wang Y S, Zhao W, Ding G L, Xiong H J 2005 Chinese. J. Lasers 32 153 (in Chinese) [杨玲珍, 陈国夫, 王屹山, 赵卫, 丁广雷, 熊红军 2005 中国激光 32 153]
[5] Huang X J, Liu Y Z, Sui Z, Li M Z, Li X, Li H H, Wang J J 2006 Acta Phys. Sin. 55 1191 (in Chinese) [黄绣江, 刘永智, 隋展, 李明中, 李忻, 林宏奂, 王建军 2006 55 1191]
[6] Chen H Y 2008 Optical Communication Technology 12 5 (in Chinese) [陈海燕 2008 光通信技术 12 5]
[7] Li J P, Chao S Y, Wu Z B, Wang Y G, Zhang Z G, Wang Q Y, Zhao Y P, Zhu X N 2005 Nanotechnology and Precision Engineering 3 142 (in Chinese) [李建萍, 曹士英, 吴祖斌, 王勇刚, 张志刚, 王清月, 赵友博, 朱晓农 2005 纳米技术与精密工程 3 142]
[8] Liu P Z, Hou J, Zhang B, Chen J B 2011 Chinese. J. Lasers 38 0702017 (in Chinese) [刘鹏祖, 侯静, 张斌, 陈金宝 2011 中国激光 38 0702017]
[9] Iijima S 1991 Nature 354 6348
[10] Li W Z, Wen J G, Senett M 2003 Chem. Phys. Lett. 368 3
[11] Ebbesen T W, Lezec H J, Hiura H 1996 Nature 382 6586
[12] Kieu K, Mansuripur M 2007 Opt. Express 32 2242
[13] Sun Z, Hasan T, Ferrari A C P 2012 Hysica E: Low-dimensional Systems and Nanostructures 44 1082
[14] Sze Y, Hiroshi Y, Yuichi T 2004 IEEE J. Sel. Top. Quantum Elect. 10 1
[15] Valle G D, Osellame R, Galzerano G 2006 Appl. Phys. Lett. 89 23
[16] Im J H, Choi S Y, Rotermund F 2010 Opt. Express 18 21
[17] Zhao H M, Lou Q H, Zhou J, Dong J X, Wei Y R, Wang Z J 2008 Acta Phys. Sin. 57 3525 (in Chinese) [赵宏明, 楼褀洪, 周军, 董景星, 魏运荣, 王之江 2008 57 3525]
[18] Dong X L, Xiao H, Ma Y X, Zhou P, Gou X F 2012 Acta Phys. Sin. 61 064207 (in Chinese) [董小林, 肖虎, 马阎星, 周朴, 郭少峰 2012 61 064207]
[19] Ren G J, Wei Z, Yao J Q 2009 Acta Phys. Sin. 58 941 (in Chinese) [任广军, 魏臻, 姚建铨 2009 58 941]
[20] Li Y, Qu S L 2011 Opt. Express 36 4236
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