Chinese Optics Letters, Vol. 16, Issue 8, 081402 (2018)
Er-doped all-fiber laser mode-locked by graphitic carbon nitride nanosheets
Zikai Dong1, Runqin Xu1, Wenhai Zhang2, Heyang Guoyu1, Lingling Hua1, Jinrong Tian1, and Yanrong Song1,*
- 1College of Applied Sciences, Beijing University of Technology, Beijing 100124, China
- 2Beijing Key Laboratory for Green Catalysis and Separation, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
Few-layer graphitic carbon nitride (g-C3N4) nanosheets were fabricated and utilized as a saturable absorber for mode-locking in an Er-doped fiber laser with net normal dispersion. The g-C3N4/polyvinyl alcohol (PVA) hybrid-film-based saturable absorber has a modulation depth of 4.01% and a saturation intensity of 7.5 MW/cm2. By integrating g-C3N4-PVA mode-locker into the laser cavity, a mode-locked operation could be obtained. The achieved mode-locking pulse centered at 1530.3 nm has a pulse width of 530 ps. Its repetition rate is 40.8 MHz, and the corresponding signal-to-noise ratio is about 55 dB.