Optics express最新文献_第9页

Physics-informed vector ptychography for imaging vector order parameters. 用于成像矢量顺序参数的物理信息矢量平面摄影。

IF 3.4 2区物理与天体物理

Optics express Pub Date : 2026-10-05 DOI: 10.1364/OE.611217

Charles Godfrey, Paolo G Radaelli

引用次数: 0

Propagating quasi-bound states in the continuum in silicon waveguides with sidewall gratings. 带侧壁光栅的硅波导中连续介质的准束缚态传播。

IF 3.4 2区物理与天体物理

Optics express Pub Date : 2026-10-05 DOI: 10.1364/OE.612792

Radovan Korček, Radek Havlíček, Jianhao Zhang, Shurui Wang, Rubin Ma, Jean Lapointe, Jens H Schmid, Pavel Cheben, Jan Nedoma

{"title":"Propagating quasi-bound states in the continuum in silicon waveguides with sidewall gratings.","authors":"Radovan Korček, Radek Havlíček, Jianhao Zhang, Shurui Wang, Rubin Ma, Jean Lapointe, Jens H Schmid, Pavel Cheben, Jan Nedoma","doi":"10.1364/OE.612792","DOIUrl":"https://doi.org/10.1364/OE.612792","url":null,"abstract":"Photonic bound states in the continuum (BICs) have emerged as an attractive platform for integrated photonic devices owing to their ability to support strongly confined optical modes with high quality factors, enabling applications in optical filtering, sensing, nonlinear optics, and laser technologies. Here, we present a fully planar quasi-BIC waveguide implemented on a 220-nm silicon-on-insulator (SOI) platform that is fully compatible with standard complementary metal-oxide-semiconductor (CMOS) fabrication processes. The device consists of a central strip waveguide, longitudinally offset sidewall gratings, and a semi-infinite slab that provides the continuum of leaky modes. The quasi-BIC state is realized by optimizing the waveguide geometry to induce destructive interference between the radiative pathways coupled to the slab-supported mode. The proposed design exhibits a narrowband, high-transmission response near the 1550-nm telecommunications wavelength, with an experimentally measured quality factor of 191, corresponding to a 3-dB bandwidth of 8 nm for a device comprising 2000 grating periods.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 20","pages":"37594-37604"},"PeriodicalIF":3.4,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149113207","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

Cryogenic terahertz magneto-optical transport in bilayer and trilayer graphene on sapphire. 蓝宝石上双层和三层石墨烯的低温太赫兹磁光传输。

IF 3.4 2区物理与天体物理

Optics express Pub Date : 2026-10-05 DOI: 10.1364/OE.611152

Chao Wang, Wen Xu, Hong-Ying Mei, Yan-Min Zhang

引用次数: 0

Effect of transverse and longitudinal current modulation on beam quality in broad area semiconductor lasers. 横向和纵向电流调制对广域半导体激光器光束质量的影响。

IF 3.4 2区物理与天体物理

Optics express Pub Date : 2026-10-05 DOI: 10.1364/OE.606104

M Facão, C Oriach-Font, J A Ramos-de-Campos, R Herrero, M Botey, K Staliunas, C Masoller

{"title":"Effect of transverse and longitudinal current modulation on beam quality in broad area semiconductor lasers.","authors":"M Facão, C Oriach-Font, J A Ramos-de-Campos, R Herrero, M Botey, K Staliunas, C Masoller","doi":"10.1364/OE.606104","DOIUrl":"https://doi.org/10.1364/OE.606104","url":null,"abstract":"Beam filamentation limits the beam quality of broad-area semiconductor lasers (BASLs), and effective mitigation strategies remain an open issue. We investigate the impact of spatial modulation of the injected current using a spatio-temporal traveling-wave model that describes the coupled longitudinal and transverse dynamics of the optical field and carrier density. The modulation is implemented as a two-dimensional current pattern, producing simultaneous variations of gain and refractive index compatible with structured electrodes. Transverse modulation alone stabilizes the near-field profile but introduces far-field side lobes associated with out-of-phase modes. The addition of longitudinal modulation modifies this behavior and can suppress these side lobes for modulation periods near Talbot-type resonance conditions. These effects persist, although reduced, in the presence of thermal refractive index variations. The results provide a realistic assessment of spatially structured current injection for beam shaping in BASLs and clarify its limitations and potential for practical implementations.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 20","pages":"37114-37127"},"PeriodicalIF":3.4,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149113222","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

Deep-learning-based robust M² factor estimation for multimode fibers from uncalibrated beam patterns. 基于深度学习的非校准光束模式多模光纤稳健M2因子估计。

IF 3.4 2区物理与天体物理

Optics express Pub Date : 2026-10-05 DOI: 10.1364/OE.613233

Yongzhi Guo, Zhen Huang, Bokai Yi, Junming Wang, Binyu Rao, Dongran Shi, Xiaofei Ma, Xiangfei Zhu, Jiajia Zeng, Chenxin Gao, Zefeng Wang

{"title":"Deep-learning-based robust M2 factor estimation for multimode fibers from uncalibrated beam patterns.","authors":"Yongzhi Guo, Zhen Huang, Bokai Yi, Junming Wang, Binyu Rao, Dongran Shi, Xiaofei Ma, Xiangfei Zhu, Jiajia Zeng, Chenxin Gao, Zefeng Wang","doi":"10.1364/OE.613233","DOIUrl":"https://doi.org/10.1364/OE.613233","url":null,"abstract":"The beam quality factor, or M2 factor, characterizes the propagation and focusing performance of laser beams. Its rapid assessment is important for online monitoring and feedback control, yet conventional measurement methods require multi-plane scans or variable-focus configurations. Deep learning enables inference from a single beam pattern, but existing approaches typically rely on standardized imaging conditions. Here, we propose a multi-scale cross-layer feature fusion network with a convolutional block attention module (MSCF-CBAM) for robust single-frame M2 factor estimation from uncalibrated multimode-fiber beam patterns. In simulations involving variations in beam scale and position, MSCF-CBAM achieves a mean absolute error of 0.0785, corresponding to reductions of 41.8% and 39.7% relative to VGG-16 and simple-CNN, respectively. Experimental validation further shows a mean relative prediction error of 2.27% for six randomly selected beam patterns subjected to random cropping, compared with 17.52% for VGG-16 and 9.19% for simple-CNN. This model can advance the practical application of deep-learning-based beam-quality estimation and provide an important means of feedback for various real-time control strategies in fiber lasers.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 20","pages":"37605-37617"},"PeriodicalIF":3.4,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149113224","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

Determination of the optimal truncation ratio for focused flattened Gaussian beams based on encircled power analysis. 基于包络功率分析的聚焦平直高斯光束最佳截断比的确定。

IF 3.4 2区物理与天体物理

Optics express Pub Date : 2026-10-05 DOI: 10.1364/OE.613504

Chuankai Luo, Xianmei Qian, Pengfei Wu

{"title":"Determination of the optimal truncation ratio for focused flattened Gaussian beams based on encircled power analysis.","authors":"Chuankai Luo, Xianmei Qian, Pengfei Wu","doi":"10.1364/OE.613504","DOIUrl":"https://doi.org/10.1364/OE.613504","url":null,"abstract":"In atmospheric propagation of high-power lasers, far-field energy concentration plays a critical role in determining system performance, and the encircled power radius serves as an important evaluation metric. Although the influence of truncation ratio on Gaussian beams has been extensively investigated, an effective truncation criterion for flattened Gaussian (FG) beams remains unavailable. In this work, an analytical expression for the focal-plane optical field of truncated FG beams in free-space propagation is derived. Based on the encircled power distribution, a quantitative criterion termed the lossless truncation ratio is proposed to determine the optimal transmitting aperture. The relationships among encircled power radius, truncation ratio, and beam order are systematically established. The results show that increasing the truncation ratio improves far-field energy concentration, although the improvement gradually saturates. The lossless truncation ratio decreases with beam order and approaches approximately 2.8 when the beam order reaches 9. To extend the analysis to realistic atmospheric environments, numerical simulations incorporating turbulence and thermal blooming effects are performed. The results reveal that stronger thermal blooming induced by higher transmitted power and stronger turbulence both reduce the optimal truncation ratio, while the influence of beam order gradually weakens at higher orders. Furthermore, comparisons with super-Gaussian beams demonstrate that the proposed criterion remains consistent for practical flat-top beam profiles and can be extended to non-integer beam orders. The proposed criterion provides a practical guideline for transmitting-aperture design and far-field energy optimization of high-power flattened Gaussian beam systems operating in atmospheric environments.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 20","pages":"37267-37285"},"PeriodicalIF":3.4,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149113289","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

Atmospheric refraction delay correction for lunar laser ranging via fusion of real-time co-located lidar and ERA5 data. 基于实时同位激光雷达与ERA5数据融合的月球激光测距大气折射延迟校正。

IF 3.4 2区物理与天体物理

Optics express Pub Date : 2026-10-05 DOI: 10.1364/OE.603405

Xin Li, Yuehua Chen, Chengkai Zhou, Jiawei Li, Wangchen Yu, Qiang Qian, Zhen Fang, Xianlin Wu, Xida Han, Xudong Lin, Ming Li

{"title":"Atmospheric refraction delay correction for lunar laser ranging via fusion of real-time co-located lidar and ERA5 data.","authors":"Xin Li, Yuehua Chen, Chengkai Zhou, Jiawei Li, Wangchen Yu, Qiang Qian, Zhen Fang, Xianlin Wu, Xida Han, Xudong Lin, Ming Li","doi":"10.1364/OE.603405","DOIUrl":"https://doi.org/10.1364/OE.603405","url":null,"abstract":"Lunar laser ranging (LLR) is a fundamental tool for investigating the Earth-Moon system and gravitational physics. To meet the millimeter-level ranging accuracy required by next-generation LLR, atmospheric refraction delay correction has become a critical bottleneck. This paper proposes a multi-source data fusion ray-tracing (MFRT) method. The primary innovation lies in dynamically integrating real-time, co-located temperature profiles from a pure rotational Raman (PRR) lidar, bias-corrected fifth-generation European Centre for Medium-Range Weather Forecasts reanalysis (ERA5) data, and the 1976 U.S. Standard Atmosphere model. This method constructs all-altitude atmospheric refractive index profiles extending from the station surface to 100 km. Consequently, it achieves real-time, co-located correction of the atmospheric refraction delay for LLR. Two independent experiments were conducted: First, the Mendes-Pavlis (MP) and Marini-Murray (MM) models were evaluated against ray-tracing benchmarks using two years of radiosonde data. The results show that the MP model outperforms the MM model. However, its correction errors can reach up to 14.7 mm locally, confirming that empirical models struggle to meet millimeter-level requirements. Second, practical ranging experiments were conducted at the TianQin (22.34∘N, 113.55∘E) station targeting the LAGEOS satellites and lunar corner cube retroreflector arrays (Apollo 15 and Luna 21). These experiments demonstrate that the MFRT method improves ranging accuracy by up to 14.7 mm compared to the MP model. Collectively, these results indicate that empirical models are subject to non-negligible localized systematic errors. In contrast, the MFRT method exhibits stable and superior correction performance in both satellite laser ranging (SLR) and LLR, marking a critical step toward achieving millimeter-level accuracy.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 20","pages":"36762-36774"},"PeriodicalIF":3.4,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149113308","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

Linear least-square regression model to predict supercontinuum generation in χ⁽³⁾ waveguides. 预测χ(3)波导超连续谱产生的线性最小二乘回归模型。

IF 3.4 2区物理与天体物理

Optics express Pub Date : 2026-10-05 DOI: 10.1364/OE.606686

Aritra Paul, Jaymes Gourlas, Isa Ahmadalidokht, Srijan Singh, Hadi Mahmodi, Christopher G Poulton, Irina Kabakova

{"title":"Linear least-square regression model to predict supercontinuum generation in χ(3) waveguides.","authors":"Aritra Paul, Jaymes Gourlas, Isa Ahmadalidokht, Srijan Singh, Hadi Mahmodi, Christopher G Poulton, Irina Kabakova","doi":"10.1364/OE.606686","DOIUrl":"https://doi.org/10.1364/OE.606686","url":null,"abstract":"Supercontinuum-based optical frequency comb sources (OFCs) have become an essential tool for various scientific and technological applications. Typically, these OFCs are generated by nonlinear optical interactions using high peak-power femtosecond lasers in χ(3) waveguides. The spectral-temporal profile of these supercontinuum OFCs often dictates the application limitations. Thus, to gain insights into supercontinuum generation, the generalized nonlinear Schrodinger's equation (GNLSE) is employed as an efficient mathematical model. With known optical and waveguide parameters like the nonlinear coefficient, effective length, and higher-order dispersion coefficients, the GNLSE can accurately simulate the evolution of the supercontinuum spectral broadening. However, the complete dispersion profile, including higher order terms, is often difficult to obtain, especially when the material properties and geometries are proprietary. In such cases, complex numerical simulations are required to determine the higher-order dispersion coefficients. To overcome this, we demonstrate a linear least squares regression model to estimate the higher-order dispersion coefficients using limited datasheet information or dispersion-parameters for χ(3) waveguides and simulate the supercontinuum broadening using the GNLSE. We validate our simulation with experimental results from a silica photonic crystal fiber using a femtosecond laser as a pump source. We also compare the model with supercontinuum generated from a 7 mm long silicon nitride waveguide. The simulations closely match the experimental observations spanning approximately a 2-octave optical bandwidth.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 20","pages":"37340-37353"},"PeriodicalIF":3.4,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149113330","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

K-means clustering of single-shot pulses from gain-switched semiconductor lasers with Shannon entropy. 具有香农熵的增益开关半导体激光器单次脉冲的k均值聚类。

IF 3.4 2区物理与天体物理

Optics express Pub Date : 2026-10-05 DOI: 10.1364/OE.610992

Masataka Kobayashi, Junko Usukura, Yihan Qi, Ryo Tamaki, Hidekazu Nakamae, Changsu Kim, Takashi Ito, Shaoqiang Chen, Yohei Kobayashi, Jun Takeda, Ikufumi Katayama, Hidefumi Akiyama

引用次数: 0

Towards simultaneous methane clumped-isotopologue and radiocarbon measurements by cavity-ring-down spectroscopy. 用空腔衰荡光谱同时测量甲烷块状同位素和放射性碳。

IF 3.4 2区物理与天体物理

Optics express Pub Date : 2026-10-05 DOI: 10.1364/OE.608132

Mehr Fatima, Ville Ulvila, Ivan Prokhorov, Gang Li, Joachim Mohn, Thomas Hausmaninger

{"title":"Towards simultaneous methane clumped-isotopologue and radiocarbon measurements by cavity-ring-down spectroscopy.","authors":"Mehr Fatima, Ville Ulvila, Ivan Prokhorov, Gang Li, Joachim Mohn, Thomas Hausmaninger","doi":"10.1364/OE.608132","DOIUrl":"https://doi.org/10.1364/OE.608132","url":null,"abstract":"Methane (CH4) is a potent greenhouse gas, and proper source attribution is essential for effective climate change mitigation. Traditional measurement techniques, such as singly substituted isotope ratio measurements (δ13C and δD) by IRMS or optical spectroscopy, often struggle to distinguish between different methane sources because their isotopic ratios can overlap. Doubly substituted isotope analysis, commonly referred to as clumped isotope analysis, offers improved differentiation. However, these isotopologues are challenging to detect due to their low abundance. In this study, we demonstrate the detection of a doubly substituted methane isotopologue (13CH3D) using cavity-ring-down spectroscopy (CRDS) at a wavelength of 4.5 µm, a region also used for the detection of 14CO2. We further present a comprehensive data analysis routine for our CRDS measurements, including higher order mode filtering based on signal selection criteria, and relative and absolute frequency calibration. The approach is general and can be applied to other CRDS systems. Spectral lines recently assigned to 13CH3D were addressed and characterized. The system achieves a precision of 19‰ at an averaging time of 50 minutes for 13CH3D. Our results demonstrate that CRDS provides a sensitive and reliable approach for monitoring doubly substituted methane isotopologues on a shared platform with the capability for radiocarbon detection.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 20","pages":"38560-38571"},"PeriodicalIF":3.4,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149113383","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