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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, a double-clad ytterbium-doped fiber is used as gain medium, and a single-walled carbon nanotube is used as a saturated absorber to obtain a mode-locked pulsed laser with a maximum output of 336mW. A D-shaped region was prepared, and a saturated carbon nanotube absorber was successfully prepared by dripping single-walled carbon nanotube solution on a D-shaped optical fiber. The saturation absorption property was tested and found to be 27% And the mode-locked mode fiber laser with ring cavity structure was fabricated by using the saturated absorber as mode-locked device.When the pumping power was 4W, the pulse width was 93.8fs, the center wavelength was 1083.8nm and the 3dB spectrum width was 8.6nm. Femtosecond pulse laser output with a frequency of 5.59 MHz and an average power of 336 mW.