Q-switched operation of erbium-doped fiber laser based on Ge2Sb2Te5 saturable absorber under positive and negative net dispersion conditions

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2025-03-14 DOI:10.1016/j.optmat.2025.116946

Xiaoyu Zhao , Xinxin Shang , Shuaimeng Li , Lezheng Wang , Yutian He , Hao Tan , Yu Wei , Shenggui Fu , Guomei Wang , Wenfei Zhang , Caixun Bai , Nannan Xu , Cheng Lu , Huanian Zhang

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引用次数: 0

Abstract

In our experiment, Ge₂Sb₂Te₅ (GST)-Polyvinyl Alcohol (PVA) was prepared using the liquid phase exfoliation method. Many systematic characterizations of GST nanosheets were conducted. We used GST-PVA as a nonlinear saturable absorber and achieved both positive and negative dispersion Q-switched pulse operation by adjusting the length of the doped fiber. Under negative dispersion conditions, we obtained Q-switched pulses with a repetition frequency of up to 75.32 kHz and a central wavelength of 1560.3 nm. Subsequently, by increasing the length of the doped fiber, we obtained dual-wavelength Q-switched pulses with central wavelengths of 1531.88 nm and 1559.16 nm under positive dispersion conditions. The repetition frequency of the Q-switched fiber laser changed from 25.02 kHz to 49.92 kHz, with a tuning range of approximately 24.9 kHz. The maximum pulse energy reached 41.67 nJ. Furthermore, by adjusting the pump power, another type of dual-wavelength Q-switched pulse was recorded. We also observed the transition from dual-wavelength Q-switched pulses to dual-wavelength conventional soliton mode locked's transition state. This is the first time that GST-PVA has been used as a saturable absorber for Q-switched pulses and the first study of doped fiber lasers with GST-PVA as a saturable absorber under positive dispersion conditions. Our study indicates that GST has broad research prospects in the field of fiber lasers. GST nanosheets open up new opportunities for the development of future high-performance photonic devices.

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.