Journal of Physics-Photonics最新文献_第5页

Measurement of ultrashort laser pulses with a time-dependent polarization state using the d-scan technique 利用 d 扫描技术测量随时间变化的偏振态超短激光脉冲

IF 3.8

Journal of Physics-Photonics Pub Date : 2024-01-18 DOI: 10.1088/2515-7647/ad1c6c

Daniel Díaz Rivas, Ann-Kathrin Raab, Chen Guo, Anne-Lise Viotti, Ivan Sytcevich, Anne L’Huillier, Cord Arnold

{"title":"Measurement of ultrashort laser pulses with a time-dependent polarization state using the d-scan technique","authors":"Daniel Díaz Rivas, Ann-Kathrin Raab, Chen Guo, Anne-Lise Viotti, Ivan Sytcevich, Anne L’Huillier, Cord Arnold","doi":"10.1088/2515-7647/ad1c6c","DOIUrl":"https://doi.org/10.1088/2515-7647/ad1c6c","url":null,"abstract":"The dispersion scan (d-scan) technique is extended to measurement of the time-dependent polarization state of ultrashort laser pulses. In the simplest implementation for linearly polarized ultrashort pulses, the d-scan technique records the second harmonic generation spectrum as a function of a known spectral phase manipulation. By applying this method to two orthogonally polarized projections of an arbitrary polarized electric field and by measuring the spectrum at an intermediate angle, we can reconstruct the evolution over time of the polarization state. We demonstrate the method by measuring a polarization gate generated from <inline-formula>\u0000<tex-math><?CDATA $6,mathrm{fs}$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mn>6</mml:mn><mml:mrow><mml:mi mathvariant=\"normal\">f</mml:mi><mml:mi mathvariant=\"normal\">s</mml:mi></mml:mrow></mml:math>\u0000<inline-graphic xlink:href=\"jpphotonad1c6cieqn1.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> pulses with a combination of waveplates. The measurements are compared to simulations, showing an excellent agreement.","PeriodicalId":44008,"journal":{"name":"Journal of Physics-Photonics","volume":"15 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139506390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Off-the-shelf optical systems design enabled by an evolution strategy: front stop case 通过演进策略实现现成光学系统设计：前挡案例

IF 3.8

Journal of Physics-Photonics Pub Date : 2023-12-07 DOI: 10.1088/2515-7647/ad10b2

Alejandro Madrid-Sánchez, José Ortiz-Ocampo, Carlos Trujillo, Heidi Ottevaere

{"title":"Off-the-shelf optical systems design enabled by an evolution strategy: front stop case","authors":"Alejandro Madrid-Sánchez, José Ortiz-Ocampo, Carlos Trujillo, Heidi Ottevaere","doi":"10.1088/2515-7647/ad10b2","DOIUrl":"https://doi.org/10.1088/2515-7647/ad10b2","url":null,"abstract":"Commercial off-the-shelf optics enable economic and rapid solutions in the photonics industry and academia. However, the design of optical systems with off-the-shelf optics is a time-consuming task for experienced optical designers and hopeless for novice designers. In this paper, we propose an automatic optical design tool to generate optical systems using only off-the-shelf optical components without human assistance. Our solution is based on an evolution strategy (ES) that performs a discrete combinatorial optimization following optical design-based methodologies that satisfy user-defined specifications. Unlike the conventional methods, the algorithm decreases the design process time and provides optical designers with several optical solutions from where to choose and adapt for targeted applications. In this work, the ES is described and tested with front stop optical configurations. We demonstrate the broad solution domain of the algorithm through the generation of optical systems with F-numbers within a range F/1 to F/90 and field of views up to 300 mm at the image plane. To analyze the solution domain and the characteristics of the solution, we used the design specifications of 29 commercially available scan lenses and compared the performance of different ES parameters. The compatibility of our algorithm with (standard) commercially available optical design software unlocks automatic design tools for off-the-shelf optical systems.","PeriodicalId":44008,"journal":{"name":"Journal of Physics-Photonics","volume":"2 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138691303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simultaneous nonlinear spectral broadening and temporal contrast enhancement of ultrashort pulses in a multi-pass cell 多通细胞中超短脉冲的同时非线性谱宽和时间对比度增强

Journal of Physics-Photonics Pub Date : 2023-11-03 DOI: 10.1088/2515-7647/ad078a

Jaismeen KAUR, Louis Daniault, Zhao Cheng, Oscar Tourneur, Olivier Tcherbakoff, Fabrice Reau, Jean-François Hergott, Rodrigo Lopez-Martens

引用次数: 0

Research of a novel aerodynamic evaluation method for fixed-wing UAV 一种新型固定翼无人机气动性能评价方法的研究

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2633/1/012001

Yansen Wu, Deshan Liu, Tiancheng Wang, Anmin Zhao

引用次数: 0

The control equipment for the integrated use of cold energy in LNG vessels LNG船冷能综合利用控制设备

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2636/1/012012

Xin Liang, Liyuan Zheng, Xingzhi Lin

引用次数: 0

Mixed Horizontal Well Pattern and Fracturing Parameter Optimization of Low Permeability Reservoir 低渗透油藏混合水平井网布及压裂参数优化

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2636/1/012007

Qi-hao Hu, Fa-jun Guo, Hong-qiang Cao, Xiu-wei Wang, Ya-zhou Wang, Xia Wang, Hong-tao Wang, Jie-feng Cao

引用次数: 0

Numerical analysis of flow and heat transfer characteristics of supercritical endothermic hydrocarbon fuel in taper tube 超临界吸热碳氢燃料在锥形管内流动和传热特性的数值分析

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2633/1/012011

Jiajun Zhao, Hui Gao, Chen Zhang, Dongsheng Wen

引用次数: 0

Performance optimization design of wide-body aircraft pressure refueling system 宽体飞机压力加油系统性能优化设计

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2633/1/012002

Hao Gong

引用次数: 0

Experimental Study on Condensation Heat Transfer Performance of Hydrophilic/Hydrophobic Microstructured 亲/疏水微结构的冷凝换热性能实验研究

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2636/1/012048

Zhiwei He, Enlong Wen, Tao Wang, Chao Huang, Shujie Li, Ruhua Cai

{"title":"Experimental Study on Condensation Heat Transfer Performance of Hydrophilic/Hydrophobic Microstructured","authors":"Zhiwei He, Enlong Wen, Tao Wang, Chao Huang, Shujie Li, Ruhua Cai","doi":"10.1088/1742-6596/2636/1/012048","DOIUrl":"https://doi.org/10.1088/1742-6596/2636/1/012048","url":null,"abstract":"Abstract In order to study the condensation and heat transfer characteristics of similar microstructure surfaces, two similar microstructure surfaces, cylindrical and circular, were fabricated by femtosecond laser technology on a 0.5 mm silicon wafer. The cylindrical surface is superhydrophobic when the contact angle is more than 150°, and the circular surface is hydrophilic when the contact angle is less than 90°. The difference in condensation heat transfer characteristics between superhydrophobic and hydrophilic microstructures was analyzed, and a visual condensation experimental platform was built. Experimental research showed that: At the same flow rate, the heat transfer coefficient of the superhydrophobic surface and the hydrophilic surface decreases significantly with the increase of the surface subcooling degree, but the heat transfer coefficient of the cylindrical surface is still much larger than that of the circular surface. In addition, the heat transfer performance of the hydrophobic microstructure surface is better than that of the hydrophilic surface at medium and high-speed cooling water flow rates. Although the surface microstructures are similar in shape, the heat transfer performance of cylindrical microstructures is much better than that of circular microstructures under the same conditions, and the heat flux of cylindrical microstructures is 2.2 times that of circular microstructures.","PeriodicalId":44008,"journal":{"name":"Journal of Physics-Photonics","volume":"30 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135764053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

RGB and LiDAR Fusion-based 3D Semantic Segmentation for Autonomous Driving 基于RGB和LiDAR融合的自动驾驶3D语义分割

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2632/1/012034

Jianguo Liu, Zhiling Jia, Gongbo Li, Fuwu Yan, Youhua Wu, Yunfei Sun

{"title":"RGB and LiDAR Fusion-based 3D Semantic Segmentation for Autonomous Driving","authors":"Jianguo Liu, Zhiling Jia, Gongbo Li, Fuwu Yan, Youhua Wu, Yunfei Sun","doi":"10.1088/1742-6596/2632/1/012034","DOIUrl":"https://doi.org/10.1088/1742-6596/2632/1/012034","url":null,"abstract":"Abstract Projection-based multimodal 3D semantic segmentation methods suffer from information loss during the point cloud projection process. This issue becomes more prominent for small objects. Moreover, the alignment of sparse target features with the corresponding object features in the camera image during the fusion process is inaccurate, leading to low segmentation accuracy for small objects. Therefore, we propose an attention-based multimodal feature alignment and fusion network module. This module aggregates features in spatial directions and generates attention matrices. Through this transformation, the module could capture remote dependencies of features in one spatial direction. This helps our network precisely locate objects and establish relationships between similar features. It enables the adaptive alignment of sparse target features with the corresponding object features in the camera image, resulting in a better fusion of the two modalities. We validate our method on the nuScenes-lidar seg dataset. Our CAFNet achieves an improvement in segmentation accuracy for small objects with fewer points compared to the baseline network, such as bicycles (6% improvement), pedestrians (2.1% improvement), and traffic cones (0.9% improvement).","PeriodicalId":44008,"journal":{"name":"Journal of Physics-Photonics","volume":"92 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135716780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0