Optics and Laser Technology最新文献_第8页

Demosaicking customized diffusion model for snapshot polarization imaging

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-04-05 DOI: 10.1016/j.optlastec.2025.112868

Chenggong Li, Yidong Luo, Caiyun Wu, Junchao Zhang, Degui Yang, Dangjun Zhao

引用次数: 0

Tailoring microstructure and mechanical properties of IN738LC fabricated by laser powder bed fusion through processing parameter optimization

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-04-05 DOI: 10.1016/j.optlastec.2025.112887

Yi Wang, Hongmei Zhang, Hairong Bian, Jialong Du, Mingwei Lu, Kaiyu Luo, Jinzhong Lu

{"title":"Tailoring microstructure and mechanical properties of IN738LC fabricated by laser powder bed fusion through processing parameter optimization","authors":"Yi Wang, Hongmei Zhang, Hairong Bian, Jialong Du, Mingwei Lu, Kaiyu Luo, Jinzhong Lu","doi":"10.1016/j.optlastec.2025.112887","DOIUrl":"10.1016/j.optlastec.2025.112887","url":null,"abstract":"<div><div>IN738LC has been widely used in hot-end components owing to its excellent high-temperature performance, while it has still suffered from metallurgical defects during laser powder bed fusion (LPBF) due to its high crack sensitivity. This study investigated forming behavior, microstructure evolution and mechanical property of LPBF-processed IN738LC samples at different parameters (laser power of 150–300 W, scanning speed of 500–1500 mm/s). The result indicated that the decrease in energy density caused the width and depth of the melt pool to decrease and eventually broke into droplets, leading to an increase in porosity. As the scanning speed increases, the microstructure changes from irregular columnar/cellular dendrites to all distributed as columnar dendrites, exhibiting epitaxial growth. An optimal process window was finally obtained at a laser power of 200 W and a scanning speed of 1000 mm/s, which achieved excellent forming quality (the porosity of 0.01 %) and mechanical properties (microhardness of 445.5 HV, ultimate tensile strength of 1335 MPa and elongation of 19.3 %). This study provides process basis for subsequent studies of IN738LC fabricated by LPBF.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"188 ","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143776592","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 Al content in n-AlGaInP window layer enhances the efficiency of red micro-LEDs

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-04-05 DOI: 10.1016/j.optlastec.2025.112876

Zhicheng Lu , Wenjie He , Minhua Li , Xi Zheng , Yurong Dai , Zhiyong Li , Yijun Lu , Zhong Chen , Weijie Guo

引用次数: 0

Mechanisms of crack formation and suppression strategies in laser pulsed welding of 3J01 high elastic alloy and 1J22 soft magnetic alloy

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-04-05 DOI: 10.1016/j.optlastec.2025.112928

Jiacai Wang , Hanling Guo , Xuan Xiao , Yue Mao , Li Fu

{"title":"Mechanisms of crack formation and suppression strategies in laser pulsed welding of 3J01 high elastic alloy and 1J22 soft magnetic alloy","authors":"Jiacai Wang , Hanling Guo , Xuan Xiao , Yue Mao , Li Fu","doi":"10.1016/j.optlastec.2025.112928","DOIUrl":"10.1016/j.optlastec.2025.112928","url":null,"abstract":"<div><div>The joining of 3J01 and 1J22 alloys is widely used in precision electronic equipment and aviation system integration to meet structural demands for magnetic isolation and mechanical support. However, the welding process for these dissimilar materials often exhibits instability, frequently leading to defects such as cracks. Building upon this foundation, this study systematically investigates the thermal–mechanical behavior and crack formation mechanisms during laser pulsed welding of dissimilar 3J01 and 1J22 alloys through an integrated simulation-experimental approach. The results indicate that crack initiation is directly linked to stress concentration at the leading edge of the melt pool on the 3J01 base metal, and the excessive Ti content around the crack area increases the brittleness temperature range during the solidification process of melt pool. To mitigate this issue, a laser preheating technique was introduced, when the preheating parameters were set to a laser power of 1.2 kW, frequency of 30 Hz, pulse width of 4 ms, and welding speed of 8 mm/s, the peak stress was reduced by 13 % compared to the weld without preheating, with a significant reduction in high-stress regions. In conclusion, the preheating method significantly reduces the number of hot cracks in the welds of dissimilar 3J01 and 1J22 alloys during pulsed laser welding, effectively suppresses the propagation of transverse cracks, and greatly enhances the overall quality of the weld.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"188 ","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143776613","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

Analysis of optical surge impact on gain equalization of FM-EDFA

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-04-05 DOI: 10.1016/j.optlastec.2025.112845

Kaihua Hu , Li Pei , Jianshuai Wang , Zhouyi Hu , Wenxuan Xu , Long Zhang , Li Zhong

{"title":"Analysis of optical surge impact on gain equalization of FM-EDFA","authors":"Kaihua Hu , Li Pei , Jianshuai Wang , Zhouyi Hu , Wenxuan Xu , Long Zhang , Li Zhong","doi":"10.1016/j.optlastec.2025.112845","DOIUrl":"10.1016/j.optlastec.2025.112845","url":null,"abstract":"<div><div>Gain equalization of few-mode erbium-doped fiber amplifiers (FM-EDFAs) determines the power balance of multiple signal channels. For mode-division multiplexed (MDM) optical transmission systems, the optical surge significantly impacts the gain equalization, enlarging the differential modal gain (DMG). In this paper, we investigate the impact of optical surge on the performance of FM-EDFAs through both theory and experiment. The simulation results indicate that in the transient state, the ability to accumulate erbium ions at the <sup>4</sup>I<sub>13/2</sub> energy level depends on the position within the transverse erbium-doped area, affecting the ability to amplify different modes in fiber due to their unique field distribution. As a result, this phenomenon leads to increased DMG in an FM-EDFA. Besides, both simulation and experiment results verify that the DMG is highly frequency-dependent. Specifically, in our experiment, the DMG is 3 dB at the envelope frequency of 100 Hz, while it is 0.6 dB at 1 MHz. All results provide a guideline for the optimization of FM-EDFAs employed in high-capacity MDM optical communication and sensor systems.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"188 ","pages":"Article 112845"},"PeriodicalIF":4.6,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143783763","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 scanning strategy on the thermal behavior, dimensional accuracy, microstructure and hardness of selective laser melting thin-walled structures

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-04-04 DOI: 10.1016/j.optlastec.2025.112921

Chengkuan Peng , Junfeng Qi , Jingyang Li , Zhanjiao Gao , Bowen Zheng , Sanqiang Yang , Heng Shao , Jing Li , Jianchao Zhang

{"title":"Effect of scanning strategy on the thermal behavior, dimensional accuracy, microstructure and hardness of selective laser melting thin-walled structures","authors":"Chengkuan Peng , Junfeng Qi , Jingyang Li , Zhanjiao Gao , Bowen Zheng , Sanqiang Yang , Heng Shao , Jing Li , Jianchao Zhang","doi":"10.1016/j.optlastec.2025.112921","DOIUrl":"10.1016/j.optlastec.2025.112921","url":null,"abstract":"<div><div>Complex thin-walled structures are widely used in engineering, which formation mainly depends on selective laser melting. Understanding the relationship between scanning strategies and forming quality of thin-walled structures is vital for process design. In this paper, the thermal behavior of thin-walled structures under short line scanning strategy (SLSS) and long line scanning strategy (LLSS) was investigated by finite element model, and the dimensional accuracy and microstructure were characterized. The simulation results showed that the SLSS led to intense local heat accumulation, which significantly affects the molten pool morphology and duration. However, the LLSS weakened the local heat accumulation by increasing the time of a single scanning track, resulting in the molten pool size and duration decreasing. Affected by local heat accumulation, the as-built size of LLSS was larger than that of SLSS. With thickness increasing, the dimension error between the two scanning strategies gradually diminished. EBSD maps and SEM figures illustrated that the grain size and cell size produced by SLSS were much larger than that of LLSS. Due the difference in microstructure, the thin walls fabricated by LLSS exhibited higher hardness of 96.62 ∼ 98.72 HV0.5. This study hopefully deepens the understanding of the relationship between scanning strategies and printability of thin-walled structures.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"188 ","pages":"Article 112921"},"PeriodicalIF":4.6,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768023","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

Brillouin microcomb multiplexing in magnesium fluoride microbottle resonators

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-04-04 DOI: 10.1016/j.optlastec.2025.112922

Jinjie Lei , Mengyu Wang , Quanjin Kuang , Zhuang Guo , Qinggui Tan , Lijun Du , Bin Wei , Chengfeng Xie , Xingdao He , Jiulin Shi

{"title":"Brillouin microcomb multiplexing in magnesium fluoride microbottle resonators","authors":"Jinjie Lei , Mengyu Wang , Quanjin Kuang , Zhuang Guo , Qinggui Tan , Lijun Du , Bin Wei , Chengfeng Xie , Xingdao He , Jiulin Shi","doi":"10.1016/j.optlastec.2025.112922","DOIUrl":"10.1016/j.optlastec.2025.112922","url":null,"abstract":"<div><div>Backward stimulated Brillouin scattering has a wide range of applications in optics and microwave photonics. In this paper, we realize a Brillouin microcomb multiplexing in magnesium fluoride microbottle resonators by generating a stable Brillouin laser and axial two-dimensional frequency combs in the resonator. The magnesium fluoride microbottle resonator is equipped with numerous higher-order mode families with a quality factor as high as 10<sup>8</sup>. These advantages result in an effective multiplexed Kerr microcombs and Brillouin axial Kerr microcombs with comb bandwidths of up to 60 nm by varying the detuning conditions by adjusting the pump power. The magnesium fluoride microbottle resonators provide a new optical platform for practical applications in frequency conversion, comb metrology, and spectroscopy. The multiplexing approach may lead to significant simplification and flexible method in achieving comb interferometry and the deployment of the multi-comb based on microresonator.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"188 ","pages":"Article 112922"},"PeriodicalIF":4.6,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768018","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

Infrared Taper-in-Taper optical fiber sensor for moisture detection in transformer oil

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-04-04 DOI: 10.1016/j.optlastec.2025.112920

Yongkun Zhao , Jihong Zhu , Hao Wang , Lei Zhang , Ruichun Wang , Yami Ling , Haizheng Tao , Yinsheng Xu

{"title":"Infrared Taper-in-Taper optical fiber sensor for moisture detection in transformer oil","authors":"Yongkun Zhao , Jihong Zhu , Hao Wang , Lei Zhang , Ruichun Wang , Yami Ling , Haizheng Tao , Yinsheng Xu","doi":"10.1016/j.optlastec.2025.112920","DOIUrl":"10.1016/j.optlastec.2025.112920","url":null,"abstract":"<div><div>Moisture detection in transformer oil is vital for maintaining the operational efficiency and safety of power transformers. Optical fiber sensors are valued for their fast response, immunity to electromagnetic interference, and online monitoring capabilities in moisture detection in oil. However, challenges such as a high limit of detection (LOD), complex fabrication, and sensitivity to temperature variations persist. This study introduces a taper-in-taper with four-tapered (TIT4T) sensor for measuring moisture in transformer oil. The sensor is based on Ge<sub>10</sub>As<sub>30</sub>Se<sub>45</sub>Te<sub>15</sub>/Ge<sub>10</sub>As<sub>30</sub>Se<sub>47</sub>Te<sub>13</sub> infrared optical fiber. The results show that the sensitivity of the TIT4T sensor for detecting moisture content in oil is 0.21572 a.u./ppm, which is 6.3 times higher than that of the tapered sensor (0.03436 a.u./ppm). Additionally, the sensor achieves an LOD of 0.6 ppm, which is lower than the minimum value required by industry standards for moisture content in transformer oil. The sensor’s performance remains stable across varying temperatures (20–80 °C) and moisture content levels (14.5–91.5 ppm). This advanced sensing technology provides a highly sensitive, accurate, and robust solution for monitoring transformer oil conditions, contributing to the reliability and safety of power systems.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"188 ","pages":"Article 112920"},"PeriodicalIF":4.6,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768019","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

A triple-channel optical fiber SPR sensor with high performance and low cost working below 1000 nm wavelength

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-04-04 DOI: 10.1016/j.optlastec.2025.112863

Wei Tang, Wan-Ming Zhao, Junsheng Wang, Qing-Shun Qu

{"title":"A triple-channel optical fiber SPR sensor with high performance and low cost working below 1000 nm wavelength","authors":"Wei Tang, Wan-Ming Zhao, Junsheng Wang, Qing-Shun Qu","doi":"10.1016/j.optlastec.2025.112863","DOIUrl":"10.1016/j.optlastec.2025.112863","url":null,"abstract":"<div><div>In this paper, we propose for the first time a triple-channel optical fiber surface plasmon resonance (SPR) refractive index (RI) sensor with an operating band below 1000 nm. The sensor consists of a U-shaped multimode fiber, a multimode-single mode-multimode (MSM) fiber and a core-offset fiber. To improve the performance of the triple-channel sensor and reduce crosstalk, we optimized each channel. For channel 3, the U-shaped fiber sputtering method was improved to solve the problems of over-wide resonance spectrum, disturbance dip at 500 nm and spectral saturation. For channel 1 and channel 2, the resonance wavelength was separated by sputtering gold film with different thickness. In addition, the length of sensing region was optimized and the core-offset structure was introduced to reduce channel crosstalk and improve sensor performance. Finally, the performance of the triple-channel sensor was tested. In the range of 1.3320 to 1.3615 RIU, the RI sensitivity of the three channels reached 965.3 nm/RIU, 2160.8 nm/RIU and 5556.9 nm/RIU respectively. Compared with other multi-channel optical fiber SPR sensors, the sensor has excellent spectral characteristics, and all three channels work in the band less than 1000 nm, so it has the advantages of high precision and low cost, and has broad application prospects in high-throughput biochemical detection platform.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"188 ","pages":"Article 112863"},"PeriodicalIF":4.6,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768022","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-energy, high-repetition-rate LD side-pumped burst-mode green laser

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-04-03 DOI: 10.1016/j.optlastec.2025.112841

Teng Kan , Peilin Li , Qiang Liu

引用次数: 0