Optics and Laser Technology最新文献

Supercontinuum generation in singlemode fibers using dissipative soliton resonance pulses at 1560 nm 利用 1560 纳米波长的耗散孤子共振脉冲在单模光纤中产生超连续介质

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2024-10-29 DOI: 10.1016/j.optlastec.2024.112022

Piotr Jaworski, Piotr Bojęś, Karol Krzempek

{"title":"Supercontinuum generation in singlemode fibers using dissipative soliton resonance pulses at 1560 nm","authors":"Piotr Jaworski, Piotr Bojęś, Karol Krzempek","doi":"10.1016/j.optlastec.2024.112022","DOIUrl":"10.1016/j.optlastec.2024.112022","url":null,"abstract":"<div><div>In this article we explore the possibility of utilizing 1560 nm nanosecond dissipative soliton resonance pulses for generation of supercontinuum radiation in a standard singlemode fiber. The source is based on a non-complex, all-in-fiber dissipative soliton resonance mode-locked laser and two sections of fiber amplifiers, boosting the peak power and pulse energy to 147 W and 0.42 µJ, respectively. Pulses with a repetition rate and pulse duration of ∼1.01048 MHz and 2.67 ns, respectively, were injected into a standard singlemode fiber (SMF-28, Corning) with lengths between 100 m and 600 m. Induced Stimulated Raman Scattering effect resulted in a broadening of the pulse spectrum from the initial 1560 nm, up to ∼2100 nm. Our results are the first demonstration of using high-energy nanosecond pulses from a non-complex, all-in-fiber dissipative soliton resonance mode-locked laser in a frequency conversion process in a standard singlemode fiber. The proposed approach delivers an alternative solution to broadband light generation using complex nanosecond laser sources.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"181 ","pages":"Article 112022"},"PeriodicalIF":4.6,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539157","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

Mode-locked erbium-doped fiber laser based on stable narrow-gap semiconductor Nb2SiTe4 quantum dots 基于稳定窄隙半导体 Nb2SiTe4 量子点的模式锁定掺铒光纤激光器

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2024-10-29 DOI: 10.1016/j.optlastec.2024.112034

Hai-Jie Zhang , Shun Gu , Hui Long , Min-Ru Wen , Hua-Feng Dong , Li-Li Tao , Xin Zhang , Fu-Gen Wu , Li Chen

引用次数: 0

Silicon photonic polarization beam splitter assisted by polarization-Selective metamaterials with 600 nm bandwidth 带宽为 600 纳米的偏振选择性超材料辅助硅光子偏振分束器

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2024-10-29 DOI: 10.1016/j.optlastec.2024.111985

Junqi Yao , Yaxin Yu , Jiao Zhang , Min Zhu , Jinbiao Xiao

{"title":"Silicon photonic polarization beam splitter assisted by polarization-Selective metamaterials with 600 nm bandwidth","authors":"Junqi Yao , Yaxin Yu , Jiao Zhang , Min Zhu , Jinbiao Xiao","doi":"10.1016/j.optlastec.2024.111985","DOIUrl":"10.1016/j.optlastec.2024.111985","url":null,"abstract":"<div><div>Silicon photonic polarization beam splitter (PBS) is a crucial component for on-chip polarization management. PBSs typically function based on wavelength-dependent mechanisms such as evanescent coupling and modal interference. As a result, constructing a PBS with a broad bandwidth, low insertion loss, and high extinction ratio remains a significant challenge. This paper presents a novel method for achieving a PBS that is almost independent of the wavelength, which involves engineering the modal birefringence of subwavelength grating waveguides and utilizing reciprocal mode transitions. An input taper is embedded in polarization-selective metamaterials (PSMs), which are made up of two sets of subwavelength gratings arranged in different directions. As the width of the input taper decreases, the waveguide mode is no longer supported and transits into a single-mode-like (SML) component guided in the SWG waveguide. By exploiting the principle that a mode will preferentially evolve into the mode with the closest effective refractive index, polarization beam splitting is achieved during the transition of waveguide modes into SML components guided in SWGs with different arrangement directions. Results show that the proposed PBS achieves a high extinction ratio of more than 23 dB throughout a bandwidth of 600 nm (1.2–1.8 μm) for both polarizations. For TE/TM polarization, the bandwidth to achieve an insertion loss of lower than 0.41/1 dB is as large as 600 nm (1.2–1.8 μm)/530 nm (1.23–1.76 μm). As far as we know, this is the PBS with the most superior broadband performance proposed till now.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"181 ","pages":"Article 111985"},"PeriodicalIF":4.6,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539667","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

Mitigating current crowding for enhanced reliability of AlGaN-based deep-ultraviolet LEDs through triangular island-shaped p-electrode design 通过三角岛形 p 型电极设计缓解电流拥挤，提高氮化铝基深紫外 LED 的可靠性

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2024-10-29 DOI: 10.1016/j.optlastec.2024.112026

Yifang Chen , Quanjiang Lv , Ju Liu , Xu Huang , Yiwei Cao , Tianpeng Yang , Tingting Mi , Xiaowen Wang , Junlin Liu

{"title":"Mitigating current crowding for enhanced reliability of AlGaN-based deep-ultraviolet LEDs through triangular island-shaped p-electrode design","authors":"Yifang Chen , Quanjiang Lv , Ju Liu , Xu Huang , Yiwei Cao , Tianpeng Yang , Tingting Mi , Xiaowen Wang , Junlin Liu","doi":"10.1016/j.optlastec.2024.112026","DOIUrl":"10.1016/j.optlastec.2024.112026","url":null,"abstract":"<div><div>Current crowding and poor reliability due to uneven current distribution are significant challenges limiting the widespread application of AlGaN-based flip-chip deep-ultraviolet (DUV) LEDs. Herein, a novel triangular island-shaped chip structure designed to mitigate current crowding and enhance device reliability. Although this structure exhibits increased leakage current due to etching damage and the reduced effective light-emitting area compared to the interdigitated structure, it demonstrates lower operating voltage and higher wall-plug efficiency at high currents. Optical emission distribution tests confirm that the triangular island-shaped structure effectively reduces current crowding and achieves uniform light emission. After 500 h of aging, the optical power retention of the triangular island-shaped structure remains at 97.6%, and the L70 lifetime, as predicted by a lifetime model, is extended by 45% compared to the interdigitated structure. These findings highlight the critical role of mitigating current crowding in improving the reliability of AlGaN-based DUV LED chip structures.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"181 ","pages":"Article 112026"},"PeriodicalIF":4.6,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539159","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

Reaching over 500 MPa maximum flexural strength in ultra-thin glass via CO2 laser fusion cutting 通过二氧化碳激光熔融切割使超薄玻璃达到 500 兆帕以上的最大抗弯强度

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2024-10-29 DOI: 10.1016/j.optlastec.2024.112004

Sho Itoh , Naoto Nagano , Yusuke Kubota , Kohei Matsumoto , Masataka Sato , Souta Matsusaka , Hirofumi Hidai

引用次数: 0

Porosity, texture, and mechanical properties of pure copper fabricated by fine green laser powder bed fusion 利用精细绿色激光粉末床熔融技术制造的纯铜的孔隙率、纹理和机械性能

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2024-10-29 DOI: 10.1016/j.optlastec.2024.112009

Dianzheng Wang, Kailun Li, Jun Yao, Baorui Du, Yuchen Xu

引用次数: 0

Enhancing machining efficiency and precision: Water-jet guided laser fabrication of diamond micro-milling tool 提高加工效率和精度：水刀引导激光制造金刚石微铣削工具

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2024-10-29 DOI: 10.1016/j.optlastec.2024.112040

Junyun Chen , Shilong Chen , Zihao Lin , Tianye Jin , Anmin Nie

{"title":"Enhancing machining efficiency and precision: Water-jet guided laser fabrication of diamond micro-milling tool","authors":"Junyun Chen , Shilong Chen , Zihao Lin , Tianye Jin , Anmin Nie","doi":"10.1016/j.optlastec.2024.112040","DOIUrl":"10.1016/j.optlastec.2024.112040","url":null,"abstract":"<div><div>The diamond micro-milling tool is a crucial component in micro-milling technology, indispensable for the precise machining of miniaturized parts and structures. However, the manufacturing efficiency of diamond micro-milling tools is challenging due to its extreme mechanical property and micro-sized feature. In this study, Water-Jet Guided laser (WJGL) technology was explored to prepare single-crystal diamond micro-milling tool, aiming to achieve industrial-grade processing efficiency. Both energy-related parameters (laser power and scanning speed) and fluid-related parameters (water flow and shield gas) were investigated to identify the optimal conditions for superior machining quality and material removal rate (MRR). Through cutting through experiments, it was observed that medium laser energy density was most effective in enhancing surface morphology, while high energy led to excessive ablation and low energy resulted in insufficient material removal ability. Moreover, water flow and shield gas affected the kinetic energy of water jet, which reacted on the water stability and subsequent machining quality. MRR was measured and calculated via surface grooving experiments, with ablation ability being the dominant factor. The optimal parameter combination was <em>P</em> = 16 W, <em>v</em> = 6 mm/s, water pressure = 300 bar, and gas flow rate = 1.5 NL/min, achieving the surface roughness Sa/Sz = 149.9 nm/1.503 μ m and MRR of 22.976 × 10<sup>-3</sup> mm<sup>3</sup>/s. A single-crystal diamond micro-milling tool was finally well-prepared within 2 min, with higher machining precision and efficiency compared to conventional methods, highlighting the potential of WJGL for mass production of high-quality diamond micro-milling tools.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"181 ","pages":"Article 112040"},"PeriodicalIF":4.6,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539161","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

Experimental study on the multiscale surface morphology of femtosecond laser polishing of silicon carbide ceramics based on inclination angle effect 基于倾角效应的飞秒激光抛光碳化硅陶瓷多尺度表面形貌实验研究

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2024-10-29 DOI: 10.1016/j.optlastec.2024.111978

Jianbo Chen , Xiaoxiao Chen , Xuanhua Zhang , Yuhang Zhou , Chengnuo Yi , Wenwu Zhang

{"title":"Experimental study on the multiscale surface morphology of femtosecond laser polishing of silicon carbide ceramics based on inclination angle effect","authors":"Jianbo Chen , Xiaoxiao Chen , Xuanhua Zhang , Yuhang Zhou , Chengnuo Yi , Wenwu Zhang","doi":"10.1016/j.optlastec.2024.111978","DOIUrl":"10.1016/j.optlastec.2024.111978","url":null,"abstract":"<div><div>In this paper, an infrared femtosecond laser was used to polish silicon carbide ceramics at large incidence angles. For silicon carbide ceramics with different initial roughness surfaces, the improvement mechanism of laser incident angle on polishing surface quality was systematically analyzed. The effects of other process factors during laser polishing, including spot overlap rate, laser power, and scanning times, on the polishing quality when processing with a large incident angle was investigated. The results indicate that, compared to a vertically incident laser, laser polishing at large incident angles significantly enhances surface roughness. During the polishing process, the laser first removes the higher convex structures on the surface, which helps level peaks to obtain a smooth material surface. Additionally, at an incident angle of 80°, the surface roughness of the polished surface gradually decreases with the increase of the spot overlap rate in the X direction and the Y direction. The roughness only increases when the X-direction overlap rate is 95 %. As single pulse energy increases, the roughness of the polished surface shows a trend of initially increasing and then decreasing. With the increase in laser repetition frequency, the roughness of the polished surface shows a general trend of slow decrease. As the scanning times increase, the roughness of the polished surface generally exhibits a trend of initially decreasing and then increasing. Throughout the experimental process, when the laser incidence angle was set at 80°, the pulse energy at 85 μJ, the overlap rate in the X direction at 90 %, the overlap rate in the Y direction at 95 %, the laser repetition rate at 35 kHz, and the scanning times at 6, the surface roughness of the silicon carbide ceramic reached a minimum of 0.74 μm with the 1000 × magnification.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"181 ","pages":"Article 111978"},"PeriodicalIF":4.6,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539663","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

Seq2Seq model with attention for predicting nonlinear propagation of ultrafast pulses in optical fibers 用于预测光纤中超快脉冲非线性传播的 Seq2Seq 模型

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2024-10-28 DOI: 10.1016/j.optlastec.2024.112014

Yuanhang Zeng, Guangzhi Zhu, Xiao Zhu

{"title":"Seq2Seq model with attention for predicting nonlinear propagation of ultrafast pulses in optical fibers","authors":"Yuanhang Zeng, Guangzhi Zhu, Xiao Zhu","doi":"10.1016/j.optlastec.2024.112014","DOIUrl":"10.1016/j.optlastec.2024.112014","url":null,"abstract":"<div><div>The propagation of ultrashort pulses in optical fibers exhibits highly complex nonlinear dynamics, which plays a central role in the development of light sources and photonic technologies. The mainstream of the existing methods for modeling and predicting complex nonlinear propagation dynamics of ultrashort pulses in optical fibers is based on recurrent neural networks (RNNs), which use a Multi-In-Single-Out (MISO) architecture to predict the optical pulse evolution recursively. This autoregressive model is severely limited by the error accumulation problem and also requires significant computational resources. Affected by the error accumulation problem, this method often leads to severe performance degradation in long sequence prediction tasks, thus limiting the practical application of the prediction model. In this work, we propose a new non-autoregressive model using a Single-In-Multi-Out (SIMO) architecture to simulate the highly nonlinear dynamics of ultrashort pulse propagation in optical fibers. Our model is validated on the public dataset. The results show that our model can significantly reduce the prediction error in modeling and predicting the complex nonlinear propagation of ultrashort pulses in optical fibers. In addition, the required computational resources and time spent are significantly reduced. As a whole, our proposed method comprehensively outperforms the mainstream methods in terms of efficiency, accuracy and practicality. We believe our work could bring new insights into the modeling and analysis of complex ultrafast nonlinear dynamics.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"181 ","pages":"Article 112014"},"PeriodicalIF":4.6,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539539","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

Numerical simulation and experimental study of the shape variation influence on stainless steel drilling with picosecond laser 利用皮秒激光对不锈钢钻孔的形状变化影响的数值模拟和实验研究

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2024-10-28 DOI: 10.1016/j.optlastec.2024.112021

Zehui Gu, Yuyang He, Jinghu Ji, Yonghong Fu

{"title":"Numerical simulation and experimental study of the shape variation influence on stainless steel drilling with picosecond laser","authors":"Zehui Gu, Yuyang He, Jinghu Ji, Yonghong Fu","doi":"10.1016/j.optlastec.2024.112021","DOIUrl":"10.1016/j.optlastec.2024.112021","url":null,"abstract":"<div><div>The laser beam tilt induces significant changes in the shape of irradiation on the material surface, thereby affecting the ablation contour. However, the influence of tilted laser beams on micro-hole machining remains confined to a simplistic approach. This paper combines experimental and finite element simulation studies to investigate the impact of the laser angle of the incident (AOI) on micro-hole machining with picosecond lasers. A two-dimensional finite element model, including the two-temperature equation and the deformable geometry module, is established to simulate the ablative process of tilted picosecond laser beams on stainless steel. Single-pulse and multiple-pulse ablations under different AOIs are simulated using the model. Experimental results demonstrate that the inclination angle of micro-holes linearly decreases with increasing AOI, resulting in smoother hole wall surfaces. Simulation results reveal a logarithmic decrease in the peak temperatures of electrons and lattice with AOI, which is attributed to the increase in irradiation area and its influence on peak intensity. Under multiple-pulse irradiation, the ablation contour gradually tilts as AOI increases, and the ablation depth follows a logarithmic decrease with AOI.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"181 ","pages":"Article 112021"},"PeriodicalIF":4.6,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539665","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