Realization of harmonic mode-locking in thulium-doped fiber laser using In2(SO4)3-based saturable absorber

Xiaohui Ma; Kai Zhang; Qiaoxia Luo; Yiqi Chu; Kai Chen; Xian Wang; Yong Zhou; Wei Zhang; Wentan Fang; Xiaolin Chen; Song Huang; Meisong Liao; Weiqing Gao

Results in Optics (Dec 2022)

Realization of harmonic mode-locking in thulium-doped fiber laser using In2(SO4)3-based saturable absorber

Xiaohui Ma,
Kai Zhang,
Qiaoxia Luo,
Yiqi Chu,
Kai Chen,
Xian Wang,
Yong Zhou,
Wei Zhang,
Wentan Fang,
Xiaolin Chen,
Song Huang,
Meisong Liao,
Weiqing Gao

Affiliations

Xiaohui Ma: Department of Optical Engineering, School of Physics, Hefei University of Technology, Feicui Road 420, Hefei 230601, China
Kai Zhang: Department of Optical Engineering, School of Physics, Hefei University of Technology, Feicui Road 420, Hefei 230601, China
Qiaoxia Luo: Department of Optical Engineering, School of Physics, Hefei University of Technology, Feicui Road 420, Hefei 230601, China
Yiqi Chu: Department of Optical Engineering, School of Physics, Hefei University of Technology, Feicui Road 420, Hefei 230601, China
Kai Chen: Department of Optical Engineering, School of Physics, Hefei University of Technology, Feicui Road 420, Hefei 230601, China
Xian Wang: Department of Optical Engineering, School of Physics, Hefei University of Technology, Feicui Road 420, Hefei 230601, China
Yong Zhou: Department of Optical Engineering, School of Physics, Hefei University of Technology, Feicui Road 420, Hefei 230601, China
Wei Zhang: Department of Optical Engineering, School of Physics, Hefei University of Technology, Feicui Road 420, Hefei 230601, China
Wentan Fang: Department of Optical Engineering, School of Physics, Hefei University of Technology, Feicui Road 420, Hefei 230601, China
Xiaolin Chen: Department of Optical Engineering, School of Physics, Hefei University of Technology, Feicui Road 420, Hefei 230601, China
Song Huang: Department of Optical Engineering, School of Physics, Hefei University of Technology, Feicui Road 420, Hefei 230601, China
Meisong Liao: R&D Center of High-Power Laser Components, Shanghai Institute of Optics and Fine Mechanics, Shanghai 201800, China
Weiqing Gao: Department of Optical Engineering, School of Physics, Hefei University of Technology, Feicui Road 420, Hefei 230601, China; Corresponding author.

Journal volume & issue: Vol. 9
p. 100327

Abstract

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Harmonic mode-locking (HML) is realized in a thulium-doped fiber laser (TDFL) using indium sulfate (In2(SO4)3) as a saturable absorber (SA). The In2(SO4)3 has nonlinear saturable absorption properties with the nonlinear optical modulation depth of 13.3 % and the saturation power of 0.11 kW at 1930 nm. The fundamentally mode-locked pulses operate at 1964.44 nm have the 3-dB bandwidth of 4.70 nm, the pulse width of 1.266 ps, and the pulse repetition rate of 25.37 MHz. The maximum resonance frequency of 228 MHz is achieved, which corresponds to the 9th harmonic. The supermode suppression level (SMSL) up to 63 dB is realized. The spectral and temporal characteristics of the output pulses are investigated as a function of harmonic order. The experimental results demonstrated that In2(SO4)3 can be a promising mode-locker for generating harmonic ultrafast pulses in 2 μm waveband.

Published in Results in Optics

ISSN: 2666-9501 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics: Optics. Light
Website: https://www.journals.elsevier.com/results-in-optics

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