1T-polytype tantalum disulfide (1T-TaS2), an emerging strongly correlated material, features a narrow bandgap of 0.2 eV, bridging the gap between zero-bandgap graphene and large-bandgap 2D nonlinear optical (NLO) materials. Combined with its intense light absorption, high carrier concentration, and high mobility, 1T-TaS2 shows considerable potential for applications in broadband optoelectronic devices. However, its NLO characteristics and related applications have rarely been explored. Here, 1T-TaS2 nanosheets are prepared by chemical vapor deposition. The ultrafast carrier dynamics in the 400–1100 nm range and broadband NLO performance in the 515–2500 nm range are systematically studied using femtosecond lasers. An obvious saturable absorption phenomenon is observed in the visible to IR range. The nonlinear absorption coefficient is measured to be -22.60±0.52 cm MW-1 under 1030 nm, which is larger than that of other typical 2D saturable absorber (SA) materials (graphene, black phosphorus, and MoS2) under similar experimental conditions. Based on these findings, using 1T-TaS2 as a new SA, passively Q-switched laser operations are successfully performed at 1.06, 1.34, and 1.94 μm. The results highlight the promise of 1T-TaS2 for broadband optical modulators and provide a potential candidate material system for mid-IR nonlinear optical applications.

Mengxia Wang;Hailong Qiu;Tianwen Yang;Zhengping Wang;Chuanrui Zhao;Yuanan Zhao;Ting Yu;Yuyao Jiang;Meiling Chen;Yafei Lian;Ge Zhang;Hongjun Liu;Zhanggui Hu;Jianda Shao

Laboratory of Thin Film Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;Tianjin Key Laboratory of Functional Crystal Materials, Institute of Functional Crystal, Tianjin University of Technology, Tianjin 300384, China;State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;Laboratory of High Power Fiber Laser Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;College of Science, Shanghai University, Shanghai 200444, China;Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China;e-mail: qiu@tjut.edu.cn;e-mail: yazhao@siom.ac.cn;e-mail: jdshao@siom.ac.cn

光子学研究（英文）

[1]Mengxia Wang;Hailong Qiu;Tianwen Yang;Zhengping Wang;Chuanrui Zhao;Yuanan Zhao;Ting Yu;Yuyao Jiang;Meiling Chen;Yafei Lian;Ge Zhang;Hongjun Liu;Zhanggui Hu;Jianda Shao-.Broadband 1T-polytype tantalum disulfide saturable absorber for solid-state bulk lasers)[J].光子学研究（英文）,2022(09):2122

polytype

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