期刊
OPTIK
卷 246, 期 -, 页码 -出版社
ELSEVIER GMBH
DOI: 10.1016/j.ijleo.2021.167785
关键词
Saturable absorber; D-shaped fiber; Hafnium disulfide; Mode-locking; Thulium-holmium doped fiber laser
类别
资金
- Universiti Malaya [RK021-2019, TOP100PRC, RU002-2020]
- Ministry of Higher Education, Malaysia [HiCoE Phase II (PRC-2014)]
This study demonstrated the performance of hafnium disulfide (HfS2) as a saturable absorber for generating a mode-locked pulse in a thulium-holmium doped fiber laser (THDFL). The fabricated HfS2-coated D-shaped fiber showed promising modulation depth and saturation intensity, resulting in stable mode-locked pulses with high signal to noise ratio. The research focuses on the potential of HfS2 as a saturable absorber for generating short pulses in a 2 μm band region.
The performance of hafnium disulfide (HfS2) was demonstrated in this study to generate a modelocked pulse in a thulium-holmium doped fiber laser (THDFL). The drop-cast method was used to deposit HfS2 solution onto a D-shaped single-mode optical fiber. The fabricated D-shaped fiber had a modulation depth and saturation intensity of 12.3% and 7.53 MW/cm2, respectively, according to nonlinear optical absorption measurements. The evanescent wave interaction with the HfS2 based SA embedded on a D-shaped optical fiber resulted in a mode-locked pulse at a pump power of 208.6 mW with a central wavelength and pulse duration of 1916.29 nm and 1.509 ps, respectively. Meanwhile, raising the pump power to 208.6 mW results in a repetition rate of 11.10 MHz. The output shows a stable mode-locked THDFL pulse with a signal to noise ratio (SNR) of around 75.74 dB. Overall, this research focuses on the potential of HfS2 used as SA coated on a D-shaped optical fiber for the generation of short pulses in a 2 mu m band region.
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