Liuhao Zhu 1Yuping Tai 1,2Hehe Li 1Huajie Hu 1[ ... ]Yijie Shen 5,6,9,*
Author Affiliations
1 School of Physics and Engineering, Henan University of Science and Technology, Luoyang 471023, China
2 State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China
3 Shandong Provincial Engineering and Technical Center of Light Manipulations and Shandong Provincial Key Laboratory of Optics and Photonic Device, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China
4 Joint Research Center of Light Manipulation Science and Photonic Integrated Chip of East China Normal University and Shandong Normal University, East China Normal University, Shanghai 200241, China
5 Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, UK
6 Centre for Disruptive Photonic Technologies, School of Physical and Mathematical Sciences and The Photonics Institute, Nanyang Technological University, Singapore 637378, Singapore
7 e-mail:
8 e-mail:
9 e-mail:
Structured light with more extended degrees of freedom (DoFs) and in higher dimensions is increasingly gaining traction and leading to breakthroughs such as super-resolution imaging, larger-capacity communication, and ultraprecise optical trapping or tweezers. More DoFs for manipulating an object can access more maneuvers and radically increase maneuvering precision, which is of significance in biology and related microscopic detection. However, manipulating particles beyond three-dimensional (3D) spatial manipulation by using current all-optical tweezers technology remains difficult. To overcome this limitation, we theoretically and experimentally present six-dimensional (6D) structured optical tweezers based on tailoring structured light emulating rigid-body mechanics. Our method facilitates the evaluation of the methodology of rigid-body mechanics to synthesize six independent DoFs in a structured optical trapping system, akin to six-axis rigid-body manipulation, including surge, sway, heave, roll, pitch, and yaw. In contrast to previous 3D optical tweezers, our 6D structured optical tweezers significantly improved the flexibility of the path design of complex trajectories, thereby laying the foundation for next-generation functional optical manipulation, assembly, and micromechanics.
Photonics Research
2023, 11(9): 1524
Author Affiliations
1 University of Southampton, Optoelectronics Research Centre and Centre for Photonic Metamaterials, Southampton, United Kingdom
2 Harbin University of Science and Technology, Wang Da-Heng Center, Heilongjiang Key Laboratory of Quantum Control, Harbin, China
3 King’s College London, London Centre for Nanotechnology, Department of Physics, London, United Kingdom
Structured light fields embody strong spatial variations of polarization, phase, and amplitude. Understanding, characterization, and exploitation of such fields can be achieved through their topological properties. Three-dimensional (3D) topological solitons, such as hopfions, are 3D localized continuous field configurations with nontrivial particle-like structures that exhibit a host of important topologically protected properties. Here, we propose and demonstrate photonic counterparts of hopfions with exact characteristics of Hopf fibration, Hopf index, and Hopf mapping from real-space vector beams to homotopic hyperspheres representing polarization states. We experimentally generate photonic hopfions with on-demand high-order Hopf indices and independently controlled topological textures, including Néel-, Bloch-, and antiskyrmionic types. We also demonstrate a robust free-space transport of photonic hopfions, thus showing the potential of hopfions for developing optical topological informatics and communications.
topology skyrmions hopfions structured light spin-orbital interaction 
Advanced Photonics
2023, 5(1): 015001
柳强 1,2,*潘婧 1,2万震松 1,2申艺杰 1,2[ ... ]巩马理 1,2
1 清华大学精密仪器系, 北京100084
2 光子测控技术教育部重点实验室, 北京100084
几何光学 空间结构光 离轴泵浦 像散转换 泵浦整形 模式叠加 超构表面 geometric optics spatial structured light off-axis pumping astigmatism conversion pump shaping mode superposition metasurface 
2020, 47(5): 0500006
Author Affiliations
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
A frequency-degenerate cavity (FDC) is the resonator that the ratio of transverse and longitudinal mode frequency spacings is a simple rational number. When an optical resonator is close to the FDC, transverse-mode-locking (TML) takes place with drastic changes of laser mode. We report for the first time, to the best of our knowledge, the multi-frequency emission and spectral modulation effects coupled with TML in FDC. The Yb:CaGdAlO4 (Yb:CALGO) crystal with large gain bandwidth was used as a gain medium in an off-axis-pumped hemispherical FDC for realizing broadband emission. Interestingly, the spectrum can transform from a single smooth packet shape to a multi-peak structure; meanwhile, the transverse pattern accordingly transforms into some exotic wave-packet profiles through controlling off-axis displacement in a special degenerate state.
140.3410 Laser resonators 140.3518 Lasers, frequency modulated 
Chinese Optics Letters
2019, 17(3): 031404
Author Affiliations
1 State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China
2 Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education, IFSA Collaborative Innovation Center, School of Physics and Electronics, Hunan University, Changsha 410082, China
3 State Key Laboratory on Integrated Opto-electronics, College of Electronic Science & Engineering, Jilin University, Changchun 130012, China
Q-switched operation of an Nd:LuAG laser using gold nanorods (GNRs) as the saturable absorber (SA) is reported, which also produces the highest average power among the nanosecond Nd-doped Q-switched lasers by GNRs-based SA. The applied GNRs are prepared using a seed-mediated growth method and then dropped onto the quartz substrate to fabricate the SA. The average power of the Q-switched laser is 516 mW with the shortest pulse duration of 606.7 ns and the repetition rate of 265.1 kHz.
160.3380 Laser materials 140.3540 Lasers, Q-switched 160.4236 Nanomaterials 
Chinese Optics Letters
2018, 16(2): 020011
1 中国工程物理研究院应用电子学研究所, 四川 绵阳 621900
2 清华大学精密仪器系光子与电子学研究中心, 北京 100084
报道了一种室温条件下工作的高功率激光二极管(LD)端面抽运Yb∶YAG板条双波长激光放大器, 稳定的双波长运转在1029.6, 1031.5 nm。基于Yb∶YAG宽带荧光特性, 建立了双波长放大模型, 通过数值模拟研究了不同抽运条件下激光光谱放大输出特性。通过940 nm激光二极管双端抽运Yb∶YAG晶体, 拥有双波长光谱的种子光从晶体一端注入并进行放大。实验结果表明,在1.18 kW注入时获得了6.56 kW的双波长连续激光输出, 与数值模拟结果相吻合。双波长激光放大理论和实验研究为进一步实现高功率光谱合成等应用奠定了基础。
激光器 Yb∶YAG晶体 二极管抽运 双波长 lasers Yb∶YAG crystal diode pumping dual-wavelength 
2018, 45(1): 0101006

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