Optics and Laser Technology最新文献_第10页

Study on the melting characteristics of icing on overhead contact lines using high-power fiber laser 大功率光纤激光对架空接触线路结冰熔化特性的研究

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-06-05 DOI: 10.1016/j.optlastec.2025.113297

Yaqi Fang , Hao Zeng , Nnditshedzeni Eric Maluta , Weisheng Liu , Wahab Ali Shah , Xiaoxing Zhang

{"title":"Study on the melting characteristics of icing on overhead contact lines using high-power fiber laser","authors":"Yaqi Fang , Hao Zeng , Nnditshedzeni Eric Maluta , Weisheng Liu , Wahab Ali Shah , Xiaoxing Zhang","doi":"10.1016/j.optlastec.2025.113297","DOIUrl":"10.1016/j.optlastec.2025.113297","url":null,"abstract":"<div><div>The issue of icing on overhead contact lines (OCLs) seriously affects the safety and efficiency of railway transportation, and existing de-icing methods fail to meet the needs of electrified railways. In this paper, a high-power continuous fiber laser is used to conduct numerical simulations and melting ice experiments on OCLs ice-covered samples. The melting characteristics of ice layer are studied under different laser powers, scanning speeds, and laser beam focal positions. The results show that laser energy with a wavelength of 1.08 μm can penetrate the ice layer and generate a larger influence area in the direction of laser irradiation. As the laser power increases from 3 kW to 6 kW, the melting depth, top and bottom melting width grow from 4.1 mm, 0.9 mm, and 0.1 mm to 5.8 mm, 1.6 mm, and 0.2 mm (gains of 41.5 %, 77.8 %, and 100 %). At 6 kW, the melting behavior achieves maximum melting and heat transfer efficiency of 313.2 mm<sup>3</sup>/s and 14.6 %, and a minimum energy consumption of 19.2 J/mm<sup>3</sup>. Lowering the scanning speed from 60 mm/s to 15 mm/s increases the melting depth from 5.8 mm to 19.9 mm (a gain of 243.1 %), the top melting width from 1.6 mm to 3.1 mm (a gain of 93.8 %), and the bottom width from 0.2 mm to 0.6 mm (a gain of 200 %). There are maximum melting and heat transfer efficiencies of 552.2 mm<sup>3</sup>/s and 25.8 % at 15 mm/s, and minimum melting energy consumption of 10.9 J/mm<sup>3</sup>. The optimal focal position (Z = 20 mm) yields a melting depth of 7 mm, top and bottom melting widths of 2.5 mm and 0.5 mm, respectively, with the highest melting efficiency of 630 mm<sup>3</sup>/s, heat transfer efficiency of 29.4 %, and the lowest energy consumption of 9.5 J/mm<sup>3</sup>. The laser-based de-icing method proposed in this paper provides an efficient and feasible new strategy for OCLs de-icing.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"191 ","pages":"Article 113297"},"PeriodicalIF":4.6,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144212961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Volatile organic compound gas detection with a wide concentration range based on optical fiber SPR 基于光纤SPR的大浓度范围挥发性有机化合物气体检测

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-06-05 DOI: 10.1016/j.optlastec.2025.113275

Yejun Shao, Xueqing Zheng, Junlan Zhong, Zhewen Ding, Lin Yin, Ben Xu, Chunlian Zhan, Chunliu Zhao

{"title":"Volatile organic compound gas detection with a wide concentration range based on optical fiber SPR","authors":"Yejun Shao, Xueqing Zheng, Junlan Zhong, Zhewen Ding, Lin Yin, Ben Xu, Chunlian Zhan, Chunliu Zhao","doi":"10.1016/j.optlastec.2025.113275","DOIUrl":"10.1016/j.optlastec.2025.113275","url":null,"abstract":"<div><div>This paper proposes a volatile organic compound (VOC) gas sensor based on optical fiber surface plasmon resonance (SPR). The sensor uses a heterogeneous core structure of multimode fiber-single mode fiber-multimode fiber, covered by chromium (Cr) film and gold (Au) film to stimulate and spread the SPR, as a transducer. And polydimethylsiloxane (PDMS) is coating to the fiber surface as a VOC-sensitive material. The volume and refractive index changes caused by the reaction of PDMS with VOC gases alter the sensor transmission spectra significantly, which ensures the feasibility of VOC detection by the SPR sensor. According to experimental results, the sensor has outstanding stability for detect isopropanol over a broad concentration range of 0 to 1490 × 10<sup>3</sup> ppm. In a one-hour and five-days stability test, the sensor’s standard error of measurement are 0.0519 and 0.1096, respectively, indicating its good reliability in over the short to long term measurement. The SPR sensor’s broad detection range, excellent stability and straightforward fabrication process make it a promising choice for industrial applications.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"191 ","pages":"Article 113275"},"PeriodicalIF":4.6,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144212957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of different laser wavelengths on process performance and weld seam properties in copper processing for electric vehicle applications 不同激光波长对电动汽车用铜加工工艺性能和焊缝性能的影响

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-06-05 DOI: 10.1016/j.optlastec.2025.113274

Florian Kaufmann , Oliver Hentschel , Stephan Roth , Michael Schmidt

{"title":"Effects of different laser wavelengths on process performance and weld seam properties in copper processing for electric vehicle applications","authors":"Florian Kaufmann , Oliver Hentschel , Stephan Roth , Michael Schmidt","doi":"10.1016/j.optlastec.2025.113274","DOIUrl":"10.1016/j.optlastec.2025.113274","url":null,"abstract":"<div><div>Modern battery and e-drive production requires the material bonding of copper enabling highest power densities to be transmitted and functional integration to be increased. Laser beam welding has become an established manufacturing technique in this sector in recent years due to its flexibility and reproducibility. Near infrared laser beam sources are often used for the copper welding applications, as these are broadly available and proven equipment from car body manufacturing. However, they reach their limits when processing highly reflective surfaces, as the low absorptivity of copper in this wavelength range can lead to unstable incoupling or back reflection issues. The use of visible laser radiation, which is available with brilliant beam quality and kW output power at 515 nm, is an appropriate strategy to overcome these challenges. Recent studies reported on altered energy coupling and changed defect formation. However, the question of a targeted application of a green or near infrared laser system in copper welding is rarely addressed in comparative analyses in literature.</div><div>In this work, an experimental comparison was performed using two disk lasers of 515 nm and 1030 nm wavelength with similar spot characteristics in order to investigate this topic from the perspective of both seam properties and efficiency. Experimental investigations are combined with analytical models, to reveal benefits of each wavelength in copper welding for a wide range of processing parameters. The results underscore the effectiveness of green laser radiation for heat conduction welding and small capillary aspect ratios. Additionally, observed wavelength-related differences in the seam properties affect the efficiency metrics.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"191 ","pages":"Article 113274"},"PeriodicalIF":4.6,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144212959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-06-04 DOI: 10.1016/j.optlastec.2025.113303

Yang Gao, Liqing Zhang, Shuang Liu, Qinwei Wang, Tingting Ma, Decheng Guo, Lei Zhou, Ni Tang, Qiang Zhou, Rong Qiu

{"title":"Defect-related optical properties of KDP crystals caused by nanosecond laser","authors":"Yang Gao, Liqing Zhang, Shuang Liu, Qinwei Wang, Tingting Ma, Decheng Guo, Lei Zhou, Ni Tang, Qiang Zhou, Rong Qiu","doi":"10.1016/j.optlastec.2025.113303","DOIUrl":"10.1016/j.optlastec.2025.113303","url":null,"abstract":"<div><div>Potassium dihydrogen phosphate (KH<sub>2</sub>PO<sub>4</sub>, KDP) crystals are critical nonlinear optical materials in Inertial Confinement Fusion (ICF) systems. Optical properties and defect evolutions of KDP crystals induced by nanosecond laser with two wavelengths at different energy densities were investigated by means of photoluminescence (PL) spectroscopy and ultraviolet–visible (UV–Vis) transmission spectroscopy. The PL spectrum revealed that a broad emission band of KDP crystals ranging from 280 to 450 nm presented. After irradiation with two-wavelength laser, its intensity first decreased and then increased generally with respect to laser energy densities. Moreover, this emission band primarily consists of three types of defects. They are A radicals ([HPO<sub>4</sub>]<sup>-</sup>), B radicals ([H<sub>2</sub>PO<sub>4</sub>]<sup>0</sup>), and D defects ([H<sub>3</sub>PO<sub>4</sub>]<sup>2-</sup>). After laser irradiation, defect types undergo mutual transformations with energy densities, and the transformation processes strongly depend on the laser wavelength. Meanwhile, the band-gap energy (E<sub>g</sub>) and Urbach energy (E<sub>u</sub>) of KDP crystals were calculated out from UV–Vis transmission spectra after irradiation. As the laser energy density increases, the band-gap energy (E<sub>g</sub>) exhibits a trend of first decrease, then increase, followed by a reduction again, while an opposite tendency was observed for Urbach energy (E<sub>u</sub>). At the same energy density, 355 nm laser induced more significant changes than that from 1064 nm. After 10 J/cm<sup>2</sup> irradiation, the crystal undergoes remarkable changes for both wavelengths. Mechanisms underlying were discussed in detail. This study provided the insights for full applications of KDP crystals in ICF engineering.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"191 ","pages":"Article 113303"},"PeriodicalIF":4.6,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144205133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-sensitivity, high-throughput inspection of nanoscale defects using a laser confocal positioning-assisted darkfield imaging system 利用激光共聚焦定位辅助暗场成像系统对纳米级缺陷进行高灵敏度、高通量检测

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-06-04 DOI: 10.1016/j.optlastec.2025.113269

Jiaqi Hu , Tao Liu , Peirui Ji , Guofeng Zhang , Yihong Huang , Chi Fai Cheung , Shuming Yang

{"title":"High-sensitivity, high-throughput inspection of nanoscale defects using a laser confocal positioning-assisted darkfield imaging system","authors":"Jiaqi Hu , Tao Liu , Peirui Ji , Guofeng Zhang , Yihong Huang , Chi Fai Cheung , Shuming Yang","doi":"10.1016/j.optlastec.2025.113269","DOIUrl":"10.1016/j.optlastec.2025.113269","url":null,"abstract":"<div><div>Nanoscale defect inspection of patterned wafers is critical for advanced semiconductor manufacturing. However, achieving both high sensitivity and efficiency remains a key challenge in defect inspection. This paper proposes a wide-range, non-destructive nanoscale defect inspection method using a laser confocal positioning-assisted darkfield imaging system. By analyzing and extracting the spatial and frequency domain information in optical images, an inspection framework is established to enhance defect features while suppressing noise, effectively optimizing the processing of optical scattering signals. Experimental results show that the signal-to-noise ratio is improved to approximately fivefold and the defect contrast is improved to approximately sevenfold, substantially boosting inspection sensitivity. Over a line scan range of 4 mm, typical defects of patterned wafers with a line width or diameter of 55 nm are accurately inspected and located using non-destructive visible light via optical far-field mode. The proposed method has the capability for high-throughput and high-sensitivity inspection of defects on patterned wafers, and can be extended to bare wafers, with broad application potential in semiconductor manufacturing and nanotechnology researches.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"191 ","pages":"Article 113269"},"PeriodicalIF":4.6,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144205372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Accuracy evaluation of calibration methods for large field of view stereo-DIC 大视场立体定标方法的精度评价

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-06-04 DOI: 10.1016/j.optlastec.2025.113298

Kang Wei, Xinxing Shao, Xiaoyuan He

引用次数: 0

Dispersive Fourier synthesis: universal method and MATLAB tool for acousto-optic arbitrary femtosecond laser pulse shaping 色散傅立叶合成：声光任意飞秒激光脉冲整形的通用方法和MATLAB工具

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-06-04 DOI: 10.1016/j.optlastec.2025.113263

Konstantin B. Yushkov , Alexander I. Chizhikov , Victoria S. Shcherbakova , Vladimir Ya. Molchanov , Vladislav N. Ginzburg , Sergey E. Stukachev , Andrey A. Shaykin , Ivan V. Yakovlev , Efim A. Khazanov

{"title":"Dispersive Fourier synthesis: universal method and MATLAB tool for acousto-optic arbitrary femtosecond laser pulse shaping","authors":"Konstantin B. Yushkov , Alexander I. Chizhikov , Victoria S. Shcherbakova , Vladimir Ya. Molchanov , Vladislav N. Ginzburg , Sergey E. Stukachev , Andrey A. Shaykin , Ivan V. Yakovlev , Efim A. Khazanov","doi":"10.1016/j.optlastec.2025.113263","DOIUrl":"10.1016/j.optlastec.2025.113263","url":null,"abstract":"<div><div>Femtosecond pulse shaping is a variety of experimental methods for manipulating temporal profile of ultrashort laser pulses. One of common tools for pulse shaping is acousto-optic programmable Bragg gratings. We describe the Dispersive Fourier Synthesis algorithm for generating arbitrary transmission functions of acousto-optic programmable dispersive filters and delay lines used therein. The algorithm performs computation of radio-frequency waveforms providing arbitrary complex-valued transmission functions for the said devices. An open-source MATLAB script was developed based on this algorithm taking into account the ease of use of a commercial radio-frequency driver. The experiments include full validation of the algorithm: calibration of frequency-to-wavelength mapping, determination of optimal driving power, and closed-loop femtosecond pulse compression in the front-end of the PEARL (PEtawatt pARametric Laser) facility.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"191 ","pages":"Article 113263"},"PeriodicalIF":4.6,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144205371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of pulse frequency on the structure and properties of TC11 alloy prepared by laser additive manufacturing 脉冲频率对激光增材制造TC11合金组织和性能的影响

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-06-04 DOI: 10.1016/j.optlastec.2025.113304

Chunlun Chen, Zhenlin Zhang, Xin Zhang, Jinghao Zhuang, Yongsheng Zhao, Yan Liu, Shuangquan Guo, Hui Chen

{"title":"Effect of pulse frequency on the structure and properties of TC11 alloy prepared by laser additive manufacturing","authors":"Chunlun Chen, Zhenlin Zhang, Xin Zhang, Jinghao Zhuang, Yongsheng Zhao, Yan Liu, Shuangquan Guo, Hui Chen","doi":"10.1016/j.optlastec.2025.113304","DOIUrl":"10.1016/j.optlastec.2025.113304","url":null,"abstract":"<div><div>Compared with continuous wave laser, pulsed laser causes the melt pool temperature and melt motion to show periodic changes, which is conducive to obtaining finer microstructures. In this paper, TC11 titanium alloy was prepared by pulsed laser direct energy deposition (P-LDED) to improve its microstructure and tensile properties. The results show that the grain size of the pulsed laser deposited samples is significantly reduced from 3.46 μm in the samples deposited by continuous laser direct energy deposition (C-LDED) to 2.64 μm in the samples deposited by low-frequency P-LDED, and the coefficient of variation is reduced from 0.41 to 0.34. In addition, compared with the TC11 alloy deposited by C-LDED, the low-frequency pulsed laser significantly enhanced its tensile strength with an average tensile strength of 1229.2, which is a 10.1 % improvement, but the elongation decreased. Interestingly, compared to the low-frequency pulsed laser, the TC11 prepared by the high-frequency P-LDED showed a slight decrease in tensile strength but an increase in elongation of 28.3 %.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"191 ","pages":"Article 113304"},"PeriodicalIF":4.6,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144212956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

LiTaO3 versus LiNbO3 as optical-to-terahertz converter LiTaO3与LiNbO3作为光-太赫兹转换器

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-06-04 DOI: 10.1016/j.optlastec.2025.113259

S.B. Bodrov , M.V. Sarafanova , A.I. Shugurov , M.I. Bakunov

引用次数: 0

Full-colors by luminescence induced by UV excitation in carbon dots synthesized by graphite laser ablation and oxidation in liquids 石墨激光烧蚀和液体氧化合成的碳点在紫外激发下产生的全彩色发光

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-06-03 DOI: 10.1016/j.optlastec.2025.113308

L. Torrisi , D. Manno , A. Serra , A. Torrisi , M. Cutroneo

{"title":"Full-colors by luminescence induced by UV excitation in carbon dots synthesized by graphite laser ablation and oxidation in liquids","authors":"L. Torrisi , D. Manno , A. Serra , A. Torrisi , M. Cutroneo","doi":"10.1016/j.optlastec.2025.113308","DOIUrl":"10.1016/j.optlastec.2025.113308","url":null,"abstract":"<div><div>A Graphite laser ablation in biocompatible phosphate buffer solution (PBS) has been produced at different laser fluences, synthesizing carbon dots (CDs) with tunable photoluminescence (PL).</div><div>The used laser has been a repetitive <em>ns</em> pulsed Nd:YAG operating at 1064 nm. By exciting with a single-wavelength UV light at 365 nm, CDs emit stable luminescence in gradient colors, from blue to red.</div><div>The plasma generated by the laser at the carbon-liquid interface was investigated, with the objective of giving more information on the type of CDs synthesized and on their optical properties.</div><div>Optical spectroscopy was employed to analyze the CDs PL between 250 nm and 800 nm. The dispersions were submitted to UV–Vis transmittance and absorbance spectroscopies.</div><div>The CDs deposition on a silicon substrate, after drying, has been analyzed with attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy.</div><div>Results indicated that the emission band depends on the laser fluence and the different oxidation processes induced in the PBS solution.</div><div>The quantum yield (QY) has been evaluated in the order of 15% using a neutral pH solution and about 30% using an acidic pH solution.</div><div>The observed luminescence band emission shift, from about 400 nm to about 670 nm, due to a reduction of the laser fluence, has been ascribed to a gradual reduction in the CDs band gaps with the increasing incorporation of oxygen species into their surface structures.</div><div>Due to the high biocompatibility, stability, low cytotoxicity, and excellent PL properties, these CDs could be used in bio-medicine and in other fields, as will be presented and discussed.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"191 ","pages":"Article 113308"},"PeriodicalIF":4.6,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144205064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0