IF 2.7 2区物理与天体物理

Nuclear Materials and Energy Pub Date : 2025-07-28 DOI: 10.1016/j.nme.2025.101974

Cui Jing , Wang Annan , Mei Xiangchen , Li Dongjie , Yang Guangfeng

{"title":"Effect of welding speed on the microstructure and corrosion resistance of laser deep penetration welded joints of nuclear-grade 316H stainless steel","authors":"Cui Jing , Wang Annan , Mei Xiangchen , Li Dongjie , Yang Guangfeng","doi":"10.1016/j.nme.2025.101974","DOIUrl":"10.1016/j.nme.2025.101974","url":null,"abstract":"<div><div>A single-pass laser self-melting welding of nuclear-grade 316H stainless steel plate welding experiments, the study of different welding speed under the molten pool morphology and weld corrosion resistance of the changing law. The results show that with the increase of welding speed, the δ ferrite content in the weld gradually decreases, and the corrosion resistance of the weld shows a trend of increasing and then decreasing. When the welding parameters are laser power 9 kW, welding speed 1.6 m/min, and out-of-focus amount −5 mm, the weld corrosion resistance is the best.SEM observation shows that the increase of welding speed promotes the transformation of weld organization from columnar crystals to fine and uniform equiaxial crystals, and the formation of equiaxial crystals significantly improves the corrosion resistance of the weld.EDS analysis shows that the elements of Cr and Mo diffuse at high temperatures, enrich in grain boundaries, and promote ferrite and ferrite. at grain boundaries, promoting ferrite nucleation and growth, and forming coarse ferrite regions at lower welding speeds, while at higher welding speeds, rapid cooling limits element diffusion and ferrite generation, and the microstructure prefers the formation of fine equiaxed crystals.XRD analysis shows that high heat input and high temperature residence time at low welding speeds lead to the precipitation of carbon as metal carbides from the FCC lattice, and at the same time, the accumulation of carbides at grain boundaries further affects the microstructure of the weld. Carbides further affect the microstructure and corrosion resistance of the weld.</div></div>","PeriodicalId":56004,"journal":{"name":"Nuclear Materials and Energy","volume":"44 ","pages":"Article 101974"},"PeriodicalIF":2.7,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144739716","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

Ceramic-phosphor composite architecture enabling high-power laser-driven warm white lighting with enhanced color fidelity. 陶瓷-荧光粉复合结构，使高功率激光驱动的暖白色照明具有增强的色彩保真度。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2025-07-28 DOI: 10.1364/OE.568075

Zitong Liu, Jian Kang, Chang Min, Jinhua Wang, Bingheng Sun, Yang Li, Enjin Liu, Honghao Zhang, Jingjing Liu, Tomala Robert, Wieslaw Strek, Hao Chen, Jing Zhang, Qiufeng Xu, Le Zhang

{"title":"Ceramic-phosphor composite architecture enabling high-power laser-driven warm white lighting with enhanced color fidelity.","authors":"Zitong Liu, Jian Kang, Chang Min, Jinhua Wang, Bingheng Sun, Yang Li, Enjin Liu, Honghao Zhang, Jingjing Liu, Tomala Robert, Wieslaw Strek, Hao Chen, Jing Zhang, Qiufeng Xu, Le Zhang","doi":"10.1364/OE.568075","DOIUrl":"https://doi.org/10.1364/OE.568075","url":null,"abstract":"As lighting technology advances, laser-driven lighting offers high efficiency and precise beam control. However, the conversion of blue light from laser diodes into white light remains challenging due to insufficient red light emission from conventional phosphor materials, resulting in a low color rendering index (CRI) and high correlated color temperature (CCT). This study investigated a composite phosphor material designed with a layered structure of Lu3Al5O12:Ce3+ ceramic and (Sr,Ca)AlSiN3:Eu2+ phosphors, which were fabricated via vacuum sintering and spin-coating techniques. Under 460 nm excitation, the composite materials exhibited a broad emission ranging from 500-675 nm, simultaneously achieving a record-high CRI of 95.6 and luminous efficiency of 192.62 lm/W. By optimizing the red phosphor content and Ce3+ ion concentration, tunable chromaticity coordinates and CCT were demonstrated while maintaining the dual enhancement of color fidelity and energy conversion performance. Remarkably, these performance characteristics maintained stability under 32.74 W/mm2 high-power excitation, resolving the longstanding trade-off between spectral quality and luminous efficacy in laser-driven lighting systems. These findings highlight the potential of the proposed composite materials to enhance the performance and reliability of LD lighting systems, paving the way for high-quality, energy-efficient illumination solutions.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 15","pages":"31482-31495"},"PeriodicalIF":3.3,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144743690","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

Decoding the cold-cathode flat-panel X-ray source distribution by coded aperture imaging. 编码孔径成像解码冷阴极平板x射线源分布。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2025-07-28 DOI: 10.1364/OE.566728

Wangjiang Wu, Guocong Shao, Qing Li, Zengxiang Pan, Song Kang, Tian Zou, Qi Liu, Guicai Qi, Yang Chen, Xuanqin Mou, Jun Chen, Yuan Xu, Linghong Zhou

{"title":"Decoding the cold-cathode flat-panel X-ray source distribution by coded aperture imaging.","authors":"Wangjiang Wu, Guocong Shao, Qing Li, Zengxiang Pan, Song Kang, Tian Zou, Qi Liu, Guicai Qi, Yang Chen, Xuanqin Mou, Jun Chen, Yuan Xu, Linghong Zhou","doi":"10.1364/OE.566728","DOIUrl":"https://doi.org/10.1364/OE.566728","url":null,"abstract":"Different from the conventional X-ray point tube, the cold-cathode flat-panel X-ray source (FPXS) achieved planar integration of tens of thousands of X-ray point sources. However, the X-ray source distribution of the FPXS at the generating plane (Mo target) is unknown and cannot be directly measured, which hinders its practical use. To address this issue, we propose to decompose the X-ray distribution of the FPXS from the aliased projection of a coded mask. The aliased projection was a circular convolution of the source distribution of FPXS and the basic coded mask, which uniquely encodes the FPXS flux. Besides, the maximum-likelihood expectation-maximization (ML-EM) algorithm was derived to reconstruct the source distribution. Both Monte Carlo (MC) simulation and real experiments were conducted to demonstrate the effectiveness of the proposed method. In the real experiments, the X-ray emission shapes formed by placing lead plates on the surface of the anode substrate of two FPXSs were successfully reconstructed by the proposed method. Moreover, knowing and then compensating the non-uniformity distribution of the FPXS is paramount for future novel and practical applications of the X-ray source.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 15","pages":"30897-30916"},"PeriodicalIF":3.3,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144743697","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

Design of a continuous zoom system using hybrid Alvarez metalenses and refractive lenses. 使用混合Alvarez超透镜和折射透镜的连续变焦系统的设计。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2025-07-28 DOI: 10.1364/OE.569686

Zudong Zhao, Lina Gao, Dewen Cheng, Yongtian Wang, Tong Yang

引用次数: 0

Diode-pumped Tm:YLF MOPA system delivering 713 mJ pulse energy with near-diffraction-limited beam quality. 二极管泵浦Tm:YLF MOPA系统提供713 mJ脉冲能量与近衍射限制光束质量。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2025-07-28 DOI: 10.1364/OE.569391

Yan Xu, Yunjie Zhang, Nan Lin, Weichao Yao, Weibiao Chen

引用次数: 0

700 W, <10 ps, two-stage in-band pumped Nd:YVO₄ Innoslab amplifier with high efficiency. 700w， 4 Innoslab放大器，效率高。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2025-07-28 DOI: 10.1364/OE.565844

Xingliang Yin, Yang Fu, Hong Lei, Zhanda Zhu, Boyin Tai, Yutao Huang, Qiang Li

引用次数: 0

Advancing monocular depth estimation by integrating underwater optical imaging priors into transformer-based network. 将水下光学成像先验信息集成到基于变压器的网络中，推进单目深度估计。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2025-07-28 DOI: 10.1364/OE.563513

Junting Wang, Xiufen Ye

{"title":"Advancing monocular depth estimation by integrating underwater optical imaging priors into transformer-based network.","authors":"Junting Wang, Xiufen Ye","doi":"10.1364/OE.563513","DOIUrl":"https://doi.org/10.1364/OE.563513","url":null,"abstract":"Underwater monocular depth estimation is highly valuable for resource-constrained miniature autonomous robots due to its compact installation and low cost. However, underwater images are often degraded by light scattering and absorption, resulting in poor quality, low contrast, and loss of detail, making underwater monocular depth estimation even more challenging. A key research challenge is leveraging the unique characteristics of underwater imaging to improve depth estimation accuracy. To address this issue, we propose an underwater light priors processing module (ULPM), which integrates with features extracted by EfficientNet and is subsequently fed into a transformer-based network for depth estimation. It incorporates a physical model of underwater optical imaging into the transformer network, enhancing the accuracy of depth estimation. Additionally, we introduce a classification loss during training, leveraging the dual advantages of treating monocular depth estimation as both a regression and a classification task, thus enabling the network to generate more robust and accurate results. Experimental results demonstrate that our algorithm achieves the best performance on the Flsea and USOD10K datasets, outperforming existing methods across multiple evaluation metrics.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 15","pages":"32631-32648"},"PeriodicalIF":3.3,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144743673","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

Plasmon-enhanced stimulated Raman scattering of ethanol mediated by localized surface plasmon resonance from graphene quantum dots. 石墨烯量子点局部表面等离子体共振介导的等离子体增强乙醇受激拉曼散射。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2025-07-28 DOI: 10.1364/OE.567049

Danyang Cui, Wenhui Fang, Aijun Li, Shenghan Wang, Zhiwei Men

{"title":"Plasmon-enhanced stimulated Raman scattering of ethanol mediated by localized surface plasmon resonance from graphene quantum dots.","authors":"Danyang Cui, Wenhui Fang, Aijun Li, Shenghan Wang, Zhiwei Men","doi":"10.1364/OE.567049","DOIUrl":"https://doi.org/10.1364/OE.567049","url":null,"abstract":"Lowering the threshold and enhancing the intensity of stimulated Raman scattering (SRS) has been a major topic in nonlinear optics. In this work, we investigated the SRS characteristic of ethanol with graphene quantum dots (GQDs) through a Nd: YAG laser with wavelengths of 532 and 355 nm, respectively. Pure ethanol solution exhibits SRS characteristic peaks at 2943 cm-1, attributed to the symmetric stretching vibration of -CH3, the maximum energy conversion efficiency was 9.51% with 532 nm laser excitation. GQDs interact with a laser in a nanostructure environment, the edge effects of GQDs enhance light-matter interaction, contributing to localized surface plasmon resonance (LSPR) under resonant excitation, resulting in an electric field enhancement on SRS, decreasing the SRS threshold. The laser wavelength of 355 nm, which falls within the absorption band of GQDs, triggers the quantum confinement effects of GQDs, leading to the emission of fluorescence and the generation of intense LSPR. The synergistic interaction between LSPR and fluorescence enhancement effect further amplifies the SRS signal and activates the strong third-order SRS, yielding a remarkable energy conversion efficiency of 29.67% with the GQDs concentration of 0.2 mg/mL. These findings demonstrate that GQDs serve as highly efficient nonlinear optical mediators, representing an excellent candidate for advancing SRS-based photonic devices.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 15","pages":"31454-31464"},"PeriodicalIF":3.3,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144743678","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

Enhancing nonlinear compensation efficiency with multi-task neural networks for coherent optical systems. 提高相干光学系统非线性补偿效率的多任务神经网络。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2025-07-28 DOI: 10.1364/OE.563931

Tonghui Ji, Qi Wu, Zhaopeng Xu, Honglin Ji, Yu Yang, Gang Qiao, Lulu Liu, Shangcheng Wang, Zhongliang Sun, Junpeng Liang, Linsheng Fan, Jianwei Tang, Jinlong Wei, Juhao Li, Weisheng Hu

{"title":"Enhancing nonlinear compensation efficiency with multi-task neural networks for coherent optical systems.","authors":"Tonghui Ji, Qi Wu, Zhaopeng Xu, Honglin Ji, Yu Yang, Gang Qiao, Lulu Liu, Shangcheng Wang, Zhongliang Sun, Junpeng Liang, Linsheng Fan, Jianwei Tang, Jinlong Wei, Juhao Li, Weisheng Hu","doi":"10.1364/OE.563931","DOIUrl":"https://doi.org/10.1364/OE.563931","url":null,"abstract":"Traditional nonlinear compensation techniques often involve complex models that introduce significant computational overhead, particularly in high-speed, high-capacity optical communication systems. To address this challenge, we propose a low-complexity nonlinear compensation method based on a multi-task neural network (MT-NN), combined with a complexity-aware mean square error (MSE) and partial grid search optimization for coherent optical communication systems. The proposed framework exploits shared network weights to simultaneously process multiple symbols, thereby reducing redundant computations while maintaining compensation accuracy. Additionally, transfer learning (TL) is incorporated to further enhance training efficiency. Experimental results demonstrate that the MT-NN-based approach effectively lowers computational complexity across diverse optical transmission scenarios without compromising system performance. Compared to a conventional single-task neural network (ST-NN), our method achieves a superior trade-off between accuracy and efficiency. This work provides a promising solution for practical, low-complexity nonlinear compensation in next-generation optical communication systems.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 15","pages":"32417-32428"},"PeriodicalIF":3.3,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144743715","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

Feedforward cancellation of high-frequency phase noise in frequency-doubled lasers. 倍频激光器高频相位噪声的前馈消除。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2025-07-28 DOI: 10.1364/OE.555801

Zhen-Xing Hua, Yu-Xin Chao, Chen Jia, Xin-Hui Liang, Zong-Pei Yue, Meng Khoon Tey

{"title":"Feedforward cancellation of high-frequency phase noise in frequency-doubled lasers.","authors":"Zhen-Xing Hua, Yu-Xin Chao, Chen Jia, Xin-Hui Liang, Zong-Pei Yue, Meng Khoon Tey","doi":"10.1364/OE.555801","DOIUrl":"https://doi.org/10.1364/OE.555801","url":null,"abstract":"The cancellation of high-frequency laser phase noise using feedforward techniques, as opposed to feedback methods, has achieved significant advancements in recent years. However, directly applying existing feedforward techniques to laser systems based on nonlinear conversion still faces substantial challenges. Here, we propose and demonstrate a feedforward scheme that suppresses phase noise in frequency-doubled light by utilizing phase noise information of its fundamental pump. This scheme is enabled by the fact that the phase jitter of the frequency-doubled light is simply twice that of the pump, except for a first-order low-pass filtering effect introduced by the second-harmonic generation enhancement cavity. Testing this method on a 420-nm frequency-doubled laser system, we realize a 25-dB suppression of the servo noise bump near 1 MHz on the 420-nm light, and an average suppression of 30 dB for strong injected noise ranging from 100 kHz to 20 MHz. This scheme shows promising potential for applications requiring blue or ultraviolet light with minimal high-frequency phase noise, such as precision control of atoms and molecules.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 15","pages":"32518-32526"},"PeriodicalIF":3.3,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144743718","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

物理与天体物理最新文献