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laser-based defect characterization and removal process for manufacturing fused silica optic with high ultraviolet laser damage threshold

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Light(Advanced Manufacturing) 2023年第3期4卷 181-194页

作者： Xiaocong Peng Xin Cheng Chaoyang Wei Songlin Wan Kaizao Ni Zhenqi Niu Yichi Han Zhigang Jiang Zhen Cao Jianda Shao Precision Optical Manufacturing and Testing Centre Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghaiChina201800 Key Laboratory for High Power laser Material of Chinese Academy of Sciences Shanghai Institute of Optics and Fine MechanicsShanghaiChina201800 Centre of Material Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina100049 Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhouChina310024

Residual processing defects during the contact processing processes greatly reduce the anti-ultraviolet(UV)laser damage performance of fused silica optics,which significantly limited development of high-energy laser *** this study,we demonstrate the manufacturing of fused silica optics with a high damage threshold using a CO_(2)laser process *** on theoretical and experimental studies,the proposed uniform layer-by-layer laser ablation technique can be used to characterize the subsurface mechanical damage in three-dimensional full *** ablation resolutions ranging from nanometers to micrometers can be realized;the minimum longitudinal resolution islaser-induced damage thresholds of samples fabricated by the CO_(2)laser process chain were 41%(0%probability)and 65.7%(100%probability)higher than those of samples fabricated using the conventional process *** laser-based defect characterization and removal process provides a new tool to guide optimization of the conventional finishing process and represents a new direction for fabrication of highly damage-resistant fused silica optics for high-energy laser applications.

关键词： Fused silica laser materials processing Defect characterization Subsurface damage Process chain

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Investigation of latest generation pulsed fiber laser in dissimilar joining of Al and Mg alloys

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Chinese Optics Letters 2018年第6期16卷 50-53页

作者： Qiong Gao Sonia Meco Kehong Wang Qi Zhou Shun Guo Supriyo Ganguly School of Material Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China Welding Engineering and laser processing Centre Cranfield University Bedford MK43 OAL United Kingdom

Dissimilar metal joining of magnesium to aluminum was investigated using the latest generation nanosecond pulsed fiber laser. The tensile shear test shows that the average tensile shear strength of a joint was 86 MPa,which was 75% of the aluminum substrate. The weld interface exhibited a mixture phase（Mg solid solution and Mg（17）Al（12）） that improves the strength and toughness of the joint. A thin Mg–Al intermetallic compound layer was formed on both sides of the weld seam toward the Al side. Fracture occurred toward the Al substrate side rather than the Mg–Al interface, indicating a high joining strength at the weld interface.

关键词： Fiber lasers High power lasers laser beams laser materials processing Pulsed fiber lasers Pulsed operation

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Heat accumulation effects in femtosecond laser-induced subwavelength periodic surface structures on silicon

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Chinese Optics Letters 2023年第5期21卷 47-51页

作者：付强钱静王关德赵全忠 State Key Laboratory of High Field laser Physics and CAS Center for Excellence in Ultra-intense laser Science Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

High-repetition rate femtosecond lasers are shown to drive heat accumulation processes that are attractive for femtosecond laser-induced subwavelength periodic surface structures on *** laser micromachining is no longer a nonthermal process,as long as the repetition rate reaches up to 100 kHz due to heat ***,a higher repetition rate generates much better defined ripple structures on the silicon surface,based on the fact that accumulated heat raises lattice temperature to the melting point of silicon(1687 K),with more intense surface plasmons excited *** of the surface morphology on repetition rate and on the overlapping rate confirms that repetition rate and pulse overlapping rate are two competing factors that are responsible for the period of ripple *** period drifts longer because of a higher repetition rate due to increasing electron density;however,the period of laser structured surface is significantly reduced with the pulse overlapping *** Maxwell–Garnett effect is confirmed to account for the ripple period-decreasing trend with the pulse overlapping rate.

关键词： laser materials processing femtosecond laser subwavelength periodic surface structures

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Thermal process of silica glass microchannels fabricated by femtosecond laser ablation

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Chinese Optics Letters 2018年第10期16卷 60-64页

作者： Xiaoyan Sun Dongmei Cui Youwang Hu Dongkai Chu Guowei Chen Jinlong Yu Jianhang Zhou Ji'an Duan State Key Laboratory of High Performance Complex Manufacturing College of Mechanical and Electrical Engineering Central South University Changsha 410083 China

In order to improve the morphology of microchannels fabricated by femtosecond laser ablation, the thermal process was introduced into the post-treatment processing. It was found that the thermal process cannot only decrease the roughness but also the width and depth of the microchannel. The change rates of width, depth, and roughness of the microchannel increase with processing temperature. When we prolong the time of constant temperature, the change rate of the width decreases at the beginning, and then it tends to be stable. However,the change rates of depth and roughness increase, and then they tend to be stable. In this Letter, we discuss the reasons of the above phenomena.

关键词： Confocal laser scanning microscopy Femtosecond lasers laser ablation laser beams laser materials processing Ultrafast lasers

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Facile preparation of silver nanoparticles in bulk silicate glass by high-repetition-rate picosecond laser pulses

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Chinese Optics Letters 2021年第1期19卷 75-79页

作者： Danyang Shen Jing Qian Chengwei Wang Guande Wang Xuehui Wang Quanzhong Zhao State Key Laboratory of High Field laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Center of materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Technology Center Huagong Laser Engineering Co.Ltd.Wuhan 430000China

One-step precipitation of Ag nanoparticles in Ag+-doped silicate glasses was achieved through a focused picosecond laser with a high repetition rate. Absorption spectra and transmission electron microscopy(TEM) confirmed that metallic Ag nanoparticles were precipitated within glass samples in the laser-written domain. The surface plasmon absorbance fits well with the experimental absorption spectrum. The nonlinear absorption coefficient β is determined to be 2.47 × 10-14 m/W by fitting the open aperture Z-scan curve, which originated from the intraband transition in the s-p Ag band. The formation mechanism of Ag-glass nanocomposites is discussed as well.

关键词： nonlinear optical materials laser materials processing microstructure fabrication

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