目前，有机硫化物因具有容量大、资源丰富和结构可调等优点，已成为锂硫电池中最具发展前景的正极材料，其中，有机硫化物因具有丰富的结构设计、优良的储锂性能和特殊的反应机制而备受关注。基于此，回顾了有机硫化物在锂硫电池中的发展历程，综述了小分子多硫化物、聚多硫化物和硫化聚合物的最新研究进展。同时阐明了它们的结构特性和电化学机理，总结了有机硫化物的电池性能与其结构设计和官能团调节的相互关系与优化策略，并对有机硫化物的发展前景进行了探讨。
锂硫电池 有机硫化物 储锂机制 柔性电极 结构设计 lithium-sulfur battery organic sulfides lithium storage mechanism flexible electrode structural design
1 山东师范大学物理与电子科学学院, 山东 济南 250014
2 山东省光学与光子器件技术重点实验室, 山东 济南 250014
3 中国科学院上海硅酸盐研究所, 上海 201899
Nd,Gd∶CaF2是一种无序结构晶体,具有光谱宽、热导率高、透射范围大、声子能量低等优势。利用0.5%Nd,8%Gd∶CaF2晶体作为激光增益介质(百分数为原子数分数),实现了LD抽运的调谐激光输出,激光调谐波长范围为1045.7~1074.2 nm;将半导体可饱和吸收镜作为锁模元件,最终实现了双波长锁模激光输出,锁模激光器的中心波长分别位于1065.45 nm和1066.48 nm。锁模激光器的最大平均输出功率约为394 mW,最小脉冲宽度约为8.37 ps。
激光器 无序结构晶体 调谐激光 双波长 锁模激光器 二极管抽运激光器
Author Affiliations
Abstract
1 Shandong Provincial Key Laboratory of Optics and Photonic Device, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China
2 Department of Dermatology, Qianfoshan Hospital of Shandong Province, Jinan 250014, China
Two-dimensional (2D) materials have attracted intense attention in photonics and optoelectronics for their excellent nonlinear characteristics and are applied for the generation of laser pulses. Here, an active–passive Nd:GdVO41.3 μm laser is realized by using an acousto-optic modulator and gold nanobipyramids absorber. The pulse width of 150.5 ns is obtained in the doubly Q-switched laser. The compression ratio and enhancement time are 82.6% and 16. The doubly Q-switched technology compresses the pulse width, improves the peak power, and stabilizes the pulse, illustrating that double modulation technology opens the door of controllable ultrafast lasers based on 2D materials.
140.3070 Infrared and far-infrared lasers 140.3380 Laser materials 140.3480 Lasers, diode-pumped Chinese Optics Letters
2019, 17(2): 020003
Author Affiliations
Abstract
1 Shandong Provincial Key Laboratory of Optics and Photonic Device, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China
2 Institute of Data Science and Technology, Shandong Normal University, Jinan 250014, China
3 Synthetic Single Crystal Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, China
4 Key Laboratory of Transparent and Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, China
Using a novel silver nanorods absorber with a localized surface plasmon resonance absorption peak at 1.06 μm, we obtain a diode-pumped passively Q-switched (PQS) Nd,Gd:CaF2 disordered crystal laser output. Its PQS pulse laser performances are studied comprehensively and systematically in this Letter. The single pulse energy and peak power can be attained to 2.15 μJ and 2.06 W, respectively.
140.0140 Lasers and laser optics 140.3380 Laser materials 140.3480 Lasers, diode-pumped 140.3540 Lasers, Q-switched Chinese Optics Letters
2018, 16(2): 020015
1 山东师范大学物理与电子科学学院，山东 济南 250014
2 山东师范大学信息科学与工程学院，山东 济南 250014
研究了激光二极管(LD)抽运Nd∶YVO4连续波1．34 μm激光器在不同腔长时的输出特性，通过计算晶体中的振荡光光斑大小随泵浦功率的变化，分析了1．34 μm激光输出的热透镜效应对腔稳定性和激光输出特性的影响，为1．34 μm激光谐振腔的优化设计提供了基本的理论依据。实验中采用简单的平 凹腔结构，泵浦功率为756W时，得到2．39W的连续波1．34 μm激光输出，最大斜效率为36．5%，光－光转换效率为31．7%。
激光技术 全固态激光器 1．34 μm激光 热透镜效应 laser techniques all solid-state laser Nd∶YVO4 Nd∶YVO4 1.34 μm laser thermal lens effect
1 山东师范大学,物理与电子科学学院,山东,济南,250014
2 山东师范大学,信息科学与工程学院,山东,济南,250014
3 山东师范大学,物理与电子科?аг?山东,济南,250014
采用直线腔激光二极管(LD) 抽运Nd:GdVO4晶体1.34μm激光器.在泵浦功率为8W的情况下,获得连续波输出为1.91W.激光器光-光转换效率为23.9%,斜效率为29.1%.采用声光调Q,重复频率为10kHz时,得到最短脉宽、最大单脉冲能量分别为78ns和20.1μJ,最大平均输出功率为253mW.采用Nd:GdVO4晶体KTP腔内倍频激光器,在泵浦功率为6.7W时,得到单向连续红光输出为50.7mW,光-光转换效率为1.5%.
Nd:GdVO4晶体 1.34μm激光器 声光调Q 红光激光器
