VS 2 as saturable absorber for Q-switched pulse generation

Nanophotonics

article

Lu Li¹  Lihui Pang²  Qiyi Zhao¹  Yao Wang¹  Wenjun Liu³ 

[1] School of Science, Xi’an University of Posts and Telecommunications;Shaanxi Provincial Center for Regenerative Medicine and Surgical Engineering, First Affiliated Hospital, Xi’an Jiaotong University;State Key Laboratory of Information Photonics and Optical Communications, School of Science, Beijing University of Posts and Telecommunications

关键词: two-dimensional materials;    saturable absorber;    passively Q-switching;    fiber laser;   

DOI  :  10.1515/nanoph-2020-0128

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

Transition metal dichalcogenides have been widely utilized as nonlinear optical materials for laser pulse generation applications. Herein, we study the nonlinear optical properties of a VS 2 -based optical device and its application as a new saturable absorber (SA) for high-power pulse generation. Few-layer VS 2 nanosheets are deposited on the tapered region of a microfiber to form an SA device, which shows a modulation depth of 40.52%. After incorporating the microfiber-VS 2 SA into an Er-doped fiber laser cavity, passively Q-switched pulse trains could be obtained with repetition rates varying from 95 to 233 kHz. Under the pump power of 890 mW, the largest output power and shortest pulse duration are measured to be 43 mW and 854 ns, respectively. The high signal-to-noise ratio of 60 dB confirms the excellent stability of the Q-switching state. To the best of our knolowdge, this is the first illustration of using VS 2 as an SA. Our experimental results demonstrate that VS 2 nanomaterials have a large potential for nonlinear optics applications.

【 授权许可】

CC BY