Continuously bandwidth-tunable pulse generation from a SWNT mode-locked fiber laser

Guoqing Hu; Huifeng Shi; Jie Yin; Yuwei Su; Tingting Zhang; Jingwen He; Zhihui Liu

doi:10.1117/12.2523172

10 May 2019 Continuously bandwidth-tunable pulse generation from a SWNT mode-locked fiber laser

Guoqing Hu, Huifeng Shi, Jie Yin, Yuwei Su, Tingting Zhang, Jingwen He, Zhihui Liu

Proceedings Volume 11068, Second Symposium on Novel Technology of X-Ray Imaging; 110680F (2019) https://doi.org/10.1117/12.2523172
Event: Second Symposium on Novel Technology of X-Ray Imaging, 2018, Hefei, China

Abstract

The continuously bandwidth-tunable pulse generation in the SWNT mode-locked fiber laser is achieved by only tuning the intracavity polarization state. By introducing the in-line polarizer with 2-meter-long polarization maintaining fiber pigtails in a typical ring fiber laser, a bandwidth-tunable SWNT mode-locked fiber laser is constructed. The mode locker is the single-wall carbon nanotube saturable absorber, which is fabricated by optical deposition in the ~0.27 w.t % ultrasonic carbon nanotube alcohol solution. By only tuning the intracavity polarization controllers, the spectral bandwidth is continuously tuned in the range of 0.94 to 3.04 nm. We attribute the upper limit of the spectral bandwidth to the limit of the free spectral range determined by Lyot filter, which consists of polarization controllers and in-linepolarizer in the cavity. These results provide a simple way to achieve bandwidth-tunable subpicosecond pulse, which should be attractive to the applications requiring ultrafast sources with tunable bandwidth or pulsewidth.

Citation Download Citation

Guoqing Hu, Huifeng Shi, Jie Yin, Yuwei Su, Tingting Zhang, Jingwen He, and Zhihui Liu "Continuously bandwidth-tunable pulse generation from a SWNT mode-locked fiber laser", Proc. SPIE 11068, Second Symposium on Novel Technology of X-Ray Imaging, 110680F (10 May 2019); https://doi.org/10.1117/12.2523172

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KEYWORDS

Fiber lasers

Mode locking

Single walled carbon nanotubes

Polarization

Carbon nanotubes

Optical filtering

Single mode fibers

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