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Spatial light modulation for femtosecond laser manufacturing:Current developments and challenges

Science China(Technological Sciences) 2024年第1期67卷 60-72页

作者： ZANG Xue LIU ZiTing XU YiShi WANG Yi WANG Qing LI ZhenZe WANG Lei State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China State Key Laboratory of Precision Measurement and Instruments Department of Precision InstrumentTsinghua UniversityBeijing 100084China

Since the invention of lasers,spatial-light-modulated laser processing has become a powerful tool for various *** enables multidimensional and dynamic modulation of the laser beam,which significantly improves the processing efficiency,accuracy,and flexibility,and presents wider prospects over traditional mechanical technologies for machining three-dimensional,hard,brittle,or transparent *** this review,we introduce:(1)The role of spatial light modulation technology in the development of femtosecond laser manufacturing;(2)the structured light generated by spatial light modulation and its generation methods;and(3)representative applications of spatial-light-modulated femtosecond laser manufacturing,including aberration correction,parallel processing,focal field engineering,and polarization ***,we summarize the present challenges in the field and possible future research.

关键词： femtosecond laser manufacturing spatial light modulation structured light aberration correction parallel processing focal field engineering polarization control

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Ultrafast dynamics observation during femtosecond laser-material interaction

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International Journal of Extreme manufacturing 2019年第3期1卷 62-84页

作者： Baoshan Guo Jingya Sun YongFeng Lu Lan Jiang laser Micro/Nano Fabrication Laboratory School of Mechanical EngineeringBeijing Institute of TechnologyBeijing100081People’s Republic of China Department of Electrical and Computer Engineering University of Nebraska-LincolnLincolnNE 68588-0511United States of America

femtosecond laser technology has attracted significant attention from the viewpoints of fundamental and application;especially femtosecond laser processing materials present the unique mechanism of laser-material *** the extreme nonequilibrium conditions imposed by femtosecond laser irradiation,many fundamental questions concerning the physical origin of the material removal process remain *** this review,cutting-edge ultrafast dynamic observation techniques for investigating the fundamental questions,including timeresolved pump-probe shadowgraphy,ultrafast continuous optical imaging,and four-dimensional ultrafast scanning electron microscopy,are comprehensively *** technique is described in depth,beginning with its basic principle,followed by a description of its representative applications in laser-material interaction and its strengths and *** consideration of temporal and spatial resolutions and panoramic measurement at different scales are two major ***,the prospects for technical advancement in this field are discussed finally.

关键词： ultrafast dynamics pump-probe shadowgraphy ultrafast continuous optical imaging 4D ultrafast scanning electron microscopy femtosecond laser manufacturing

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femtosecond laser fabrication of nanograting-based distributed fiber sensors for extreme environmental applications

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International Journal of Extreme manufacturing 2021年第2期3卷 139-152页

作者： Mohan Wang Kehao Zhao Jingyu Wu Yuqi Li Yang Yang Sheng Huang Jieru Zhao Thomas Tweedle David Carpenter Guiqiu Zheng Qingxu Yu Kevin P Chen Department of Electrical and Computer Engineering University of PittsburghPittsburghPA 15261United States of America School of Optoelectronic Engineering and Instrument Science Dalian University of TechnologyDalian 116081People’s Republic of China Westinghouse Electric Company LLC PittsburghPA 15235United States of America Nuclear Reactor Laboratory Massachusetts Institute of Technology138 Albany StreetCambridgeMA 02139United States of America

The femtosecond laser has emerged as a powerful tool for micro-and nanoscale device fabrication. Through nonlinear ionization processes, nanometer-sized material modifications can be inscribed in transparent materials for device fabrication. This paper describes femtosecond precision inscription of nanograting in silica fiber cores to form both distributed and point fiber sensors for sensing applications in extreme environmental conditions. Through the use of scanning electron microscope imaging and laser processing optimization,high-temperature stable, Type II femtosecond laser modifications were continuously inscribed,point by point, with only an insertion loss at 1 d B m~(-1) or 0.001 d B per point sensor ***-temperature performance of fiber sensors was tested at 1000℃, which showed a temperature fluctuation of ±5.5℃ over 5 days. The low laser-induced insertion loss in optical fibers enabled the fabrication of a 1.4 m, radiation-resilient distributed fiber sensor. The in-pile testing of the distributed fiber sensor further showed that fiber sensors can execute stable and distributed temperature measurements in extreme radiation environments. Overall, this paper demonstrates that femtosecond-laser-fabricated fiber sensors are suitable measurement devices for applications in extreme environments.

关键词： femtosecond laser manufacturing optical fiber sensor device fabrication extreme environment sensing

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