Q-switched mode-locked Er-doped fiber laser with few-layer germanene nanosheets

Wenjing Tang; Baohao Xu; Lie Shi; Dehua Wu; Kang Chen; Kai Jiang; Jing Wang; Wei Xia

doi:10.1117/12.3015776

29 December 2023 Q-switched mode-locked Er-doped fiber laser with few-layer germanene nanosheets

Wenjing Tang, Baohao Xu, Lie Shi, Dehua Wu, Kang Chen, Kai Jiang, Jing Wang, Wei Xia

Proceedings Volume 12975, 6th Optics Young Scientist Summit (OYSS 2023); 129750T (2023) https://doi.org/10.1117/12.3015776
Event: 6th Optics Young Scientist Summit, 2023, Changsha, China

Abstract

Germanene (Ge) has a Dirac-type electronic structure similar to that of graphene and has excellent nonlinear saturable absorption properties, which has attracted extensive research. In this paper, few-layer Ge nanosheets were prepared and characterized in detail. Its nonlinear modulation depth was measured to be 8.5%, and the saturation intensity was 0.12 GW/cm2. Ge nanosheets are used as a saturable absorber (SA) in an Er-doped fiber laser (EDFL) to obtain a stable Q-switched mode-locking (QML) pulse. As the pump power (Ppump) increases from 64.2 mW to 204 mW, the repetition frequency (RF) and pulse width of the Q-switched (QS) envelope increase from 46.2 KHz to 109 KHz and decrease from 4.4 μs to 2.25 μs, respectively. The mode-locked pulse has a RF of 30.2 MHz with a center wavelength of 1559.6 nm. The QML pulses obtain a maximum output power of 2.278 mW and a maximum pulse energy of 20.9 nJ when the Ppump is 204 mW. Our study proves that Ge, as a high-energy light pulse absorbing material, can be used in the field of ultrafast laser.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Wenjing Tang, Baohao Xu, Lie Shi, Dehua Wu, Kang Chen, Kai Jiang, Jing Wang, and Wei Xia "Q-switched mode-locked Er-doped fiber laser with few-layer germanene nanosheets", Proc. SPIE 12975, 6th Optics Young Scientist Summit (OYSS 2023), 129750T (29 December 2023); https://doi.org/10.1117/12.3015776

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KEYWORDS

Germanium

Mode locking

Pulse signals

Nanosheets

Fiber lasers

Q switched lasers

Modulation

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