摘要
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336mW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4W时,获得了脉宽为93.8fs,中心波长为1083.8nm,3dB谱宽为8.6nm,重复频率为5.59MHz,平均功率为336mW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.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第2期283-288,共6页
Acta Physica Sinica
基金
山东省自然科学基金(批准号:ZR2010FQ017)
哈尔滨工业大学科研创新基金(批准号:HIT.NSRIF.2009146)
哈工大科技创新团队计划项目资助的课题~~
关键词
双包层光纤激光器
被动锁模
单壁碳纳米管
D形光纤
double-clad fiber lasers, passive mode locking, single-walled carbon nanotube saturable absorber, D-shaped fiber
