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Tunable and switchable harmonic h-shaped pulse generation in a 3.03 km ultralong mode-locked thulium-doped fiber laser

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Abstract

We experimentally demonstrated a type of tunable and switchable harmonic h-shaped pulse generation in a thulium-doped fiber (TDF) laser passively mode locked by using an ultralong nonlinear optical loop mirror. The total cavity length was ~3.03 km, the longest ever built for a TDF laser to our best knowledge, which resulted in an ultralarge anomalous dispersion over ?200 ps2 around the emission wavelength. The produced h-shaped pulse can operate either in a fundamental or in a high-order harmonic mode-locking (HML) state depending on pump power and intra-cavity polarization state (PS). The pulse duration, no matter of the operation state, was tunable with pump power. However, pulse breaking and self-organizing occurred, resulting in high-order HML, when the pump power increased above a threshold. At a fixed pump power, the order of HML was switchable from one to another by manipulating the PS. Switching from the 8th up to the 48th order of HML was achieved with a fixed pump power of ~4.15 W. Our results revealed the detailed evolution and switching characteristics of the HML and individual pulse envelope with respect to both the pump power and PS. We have also discussed in detail the mechanisms of both the h-shaped pulse generation and the switching of its HML. This contribution would be helpful for further in-depth study on the underlying dynamics of long-duration particular-envelope pulses with ultralarge anomalous dispersion and ultralong roundtrip time.

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DOI:10.1364/PRJ.7.000332

所属栏目:Lasers and Laser Optics

基金项目:Natural Science Foundation of Jiangsu Province10.13039/501100004608, China (BK20170243); National Natural Science Foundation of China (NSFC)10.13039/501100001809 (61705094, 11674133, 11711530208, 61575089); Key Research Program of Natural Science of Jiangsu Higher Education Institutions (17KJA416004); Royal Society10.13039/501100000288 (IE161214); Protocol of the 37th Session of China-Poland Scientific and Technological Cooperation Committee (37-17); H2020 Marie Sk?odowska-Curie Actions (MSCA)10.13039/100010665 (790666); Jiangsu Overseas Visiting Scholar Program for University Prominent Young and Middle-aged Teachers and Presidents; Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

收稿日期:2018-10-31

录用日期:2019-01-20

网络出版日期:2019-03-12

作者单位    点击查看

Junqing Zhao:Jiangsu Key Laboratory of Advanced Laser Materials and Devices, Jiangsu Collaborative Innovation Center of Advanced Laser Technology and Emerging Industry, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
Lei Li:Jiangsu Key Laboratory of Advanced Laser Materials and Devices, Jiangsu Collaborative Innovation Center of Advanced Laser Technology and Emerging Industry, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
Luming Zhao:Jiangsu Key Laboratory of Advanced Laser Materials and Devices, Jiangsu Collaborative Innovation Center of Advanced Laser Technology and Emerging Industry, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, ChinaSchool of Engineering and Materials Science, Queen Mary University of London, London, UK
Dingyuan Tang:Jiangsu Key Laboratory of Advanced Laser Materials and Devices, Jiangsu Collaborative Innovation Center of Advanced Laser Technology and Emerging Industry, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
Deyuan Shen:Jiangsu Key Laboratory of Advanced Laser Materials and Devices, Jiangsu Collaborative Innovation Center of Advanced Laser Technology and Emerging Industry, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
Lei Su:School of Engineering and Materials Science, Queen Mary University of London, London, UK

联系人作者:Luming Zhao(lmzhao@ieee.org)

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引用该论文

Junqing Zhao, Lei Li, Luming Zhao, Dingyuan Tang, Deyuan Shen, and Lei Su, "Tunable and switchable harmonic h-shaped pulse generation in a 3.03 km ultralong mode-locked thulium-doped fiber laser," Photonics Research 7(3), 332-340 (2019)

被引情况

【1】王小发,刘经惠,靳增高. 基于非线性放大环镜和Lyot滤波器的多波长与耗散孤子锁模态开关型掺铥光纤激光器. 光子学报, 2020, 49(4): 414001-414001

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