Optics express最新文献_第8页

Polarization-separated double-imaging spectroscopy for weakly-ionized plasma diagnostics. 偏振分离双成像光谱用于弱电离等离子体诊断。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-06-02 DOI: 10.1364/OE.561668

Junhwi Bak, Takuya Koiso, Richard Miles

引用次数: 0

5.3 mW at 80°C, single-mode high-power 795 nm VCSEL achieved solely through intracavity design. 仅通过腔内设计即可实现80°C时的5.3 mW，单模高功率795 nm VCSEL。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-06-02 DOI: 10.1364/OE.561214

Jingfei Mu, Gaohui Yuan, Yinli Zhou, Jianwei Zhang, Chao Chen, Tianjiao Liu, Zhuo Zhang, Yuehui Xu, Tianqi Zhang, Xiaoyan Gao, Yu Cao, Xing Zhang, Yongqiang Ning, Lijun Wang

引用次数: 0

NLTE-based atmospheric radiance modeling for space-based 4.3μm infrared detection of rocket exhaust flames. 基于nlte的天基火箭排气火焰4.3μm红外探测大气辐射建模。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-06-02 DOI: 10.1364/OE.562371

Jingyu Bai, Lu Bai, Jinlu Li

{"title":"NLTE-based atmospheric radiance modeling for space-based 4.3μm infrared detection of rocket exhaust flames.","authors":"Jingyu Bai, Lu Bai, Jinlu Li","doi":"10.1364/OE.562371","DOIUrl":"https://doi.org/10.1364/OE.562371","url":null,"abstract":"The radiance characteristics of the atmosphere background provide the basis for rocket exhaust flame detection and tracking. The traditional atmospheric radiance model uses the LTE (local thermodynamic equilibrium) model. However, at high altitudes (above 50 km), the number density distribution of molecular is no longer a function of thermodynamic temperature, at which point the molecules are in NLTE (non-local thermodynamic equilibrium). Aiming at the requirement of space-based infrared detection of the rocket exhaust flame, a modeling method of space-based background radiance characteristics was established based on the coupling of remote sensing data and the NLTE model. Further, considering the background radiance characteristics of the cloud background in the detection view of the geosynchronous orbit infrared detection system, the radiance contrast of the rocket exhaust flame in the infrared band of 4.3μm are discussed, and the detectability of the narrow band within 4.3μm is analyzed. The results show that the NLTE effect has a significant effect on the radiance and transmittance of the atmosphere, and will reduce the contrast of the infrared radiance of the rocket exhaust flame. In the modeling process of space-based detection of background radiance, it is necessary to consider the influence of the NLTE effect in the middle and upper atmosphere. This paper provides support for infrared detection of rocket exhaust flame targets.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 11","pages":"22896-22912"},"PeriodicalIF":3.2,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144294476","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

Non-volatile and multistate terahertz response in semi-floating-gate graphene field-effect transistors. 半浮栅石墨烯场效应晶体管的非易失性多态太赫兹响应。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-06-02 DOI: 10.1364/OE.561649

Jingjing Fu, Mengjian Xu, Miao Cai, Yifan Yao, Shuo Lei, Wen Cai, Yating Cai, Fei He, Shichen Zhang, Xunling Zhang, Shicong Hou, Shun Tang, Qingyang Wang, Xuguang Guo, Yiming Zhu

引用次数: 0

Design of a hyperspectral imaging gonioradiometer for appearance characterization. 用于外观表征的高光谱成像角辐射计的设计。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-06-02 DOI: 10.1364/OE.563443

Nathan Slembrouck, Jan Audenaert, Frédéric B Leloup

引用次数: 0

Determination of the T₁ state energy levels of metalloporphyrins using temperature-dependent time resolved spectroscopy. 用温度依赖时间分辨光谱法测定金属卟啉的T1态能级。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-06-02 DOI: 10.1364/OE.561134

Lu Li, Feng Qin, Zhiguo Zhang, Tao Jia

{"title":"Determination of the T1 state energy levels of metalloporphyrins using temperature-dependent time resolved spectroscopy.","authors":"Lu Li, Feng Qin, Zhiguo Zhang, Tao Jia","doi":"10.1364/OE.561134","DOIUrl":"https://doi.org/10.1364/OE.561134","url":null,"abstract":"The determination of the energy of the lowest triplet excited state (ET1) for metalloporphyrin photosensitizers, a key parameter for rationalizing energy transfer processes in metalloporphyrins, facilitates a better understanding and optimization of their functionality. In this study, a strategy was proposed for determining the ET1 values in metalloporphyrin systems by analyzing the temperature dependence of the oxygen quenching rate constant using time-resolved spectroscopy, with Platinum(II) octaethylporphyrin (PtOEP) and Palladium(II) octaethylporphyrin (PdOEP) as representative examples. Through a thermal equilibrium approximation of the excited triplet state (T1) and the excited state of oxygen, a theoretical model was introduced in which the oxygen quenching rate exhibits a nonlinear dependence on temperature, enabling the determination of ET1 values. Additionally, the validity of this approach was demonstrated through excitation spectra of metalloporphyrins. Our work provides an effective pathway and offers new insights into the energy-loss mechanisms involved in related photoconversion processes.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 11","pages":"22185-22195"},"PeriodicalIF":3.2,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144294515","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

Er/Yb-doped fiber laser with a repetition rate of ultrashort pulses of 484 MHz. 超短脉冲重复频率为484 MHz的掺铒/镱光纤激光器。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-06-02 DOI: 10.1364/OE.561404

Andrei Zverev, Vladimir Kamynin, Dmitry Korobko, Serafima Filatova, Vladimir Tsvetkov, Boris Galagan, Sergey Sverchkov, Boris Denker, Vladimir Vel'miskin, Yuriy Gladush, Dmitry Krasnikov, Albert Nasibulin, Mikhail Belkin

引用次数: 0

Evolution of topological polarization singularities in honeycomb photonic crystal slabs. 蜂窝光子晶体板拓扑极化奇点的演化。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-06-02 DOI: 10.1364/OE.551322

Jui-Cheng Chiang, Ruey-Lin Chern

{"title":"Evolution of topological polarization singularities in honeycomb photonic crystal slabs.","authors":"Jui-Cheng Chiang, Ruey-Lin Chern","doi":"10.1364/OE.551322","DOIUrl":"https://doi.org/10.1364/OE.551322","url":null,"abstract":"We study the evolution of polarization singularities in dielectric photonic crystal slabs, consisting of six rectangular holes arranged as a ring-shaped cluster with C6 symmetry in the unit cell of a honeycomb lattice. Symmetry-protected (SP) bound states in the continuum (BICs) with extremely large quality factors occur at the center of the Brillouin zone (Γ point) for the third TE-like and the first TM-like modes, which are recognized as high-order polarization singularities with topological charge q = -2. In particular, the SP BICs are recognized as vortex singularities (V points) in the far-field polarization states and identified as hexapole modes in the near-field electromagnetic distribution. By rotating three non-adjacent rectangular holes about each of their centroids to break C2 symmetry, while preserving C3 symmetry, the high-order SP BIC is transformed into a low-order BIC with q = +1, accompanied by a group of six circularly polarized states (C points) with q = -1/2, symmetrically located around the Γ point. The evolution of polarization singularities is further manifested in the translation and rotation of the C points in the momentum space when the degree of symmetry breaking is increased.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 11","pages":"23782-23795"},"PeriodicalIF":3.2,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144294532","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

Fresnel zone plate outperforms the metalens at high NA. 菲涅耳带片在高NA下优于超构透镜。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-06-02 DOI: 10.1364/OE.560866

Apratim Majumder, John A Doughty, Tina M Hayward, Henry I Smith, Rajesh Menon

引用次数: 0

High-accuracy strain sensing of frequency-scanned phase-sensitive optical time domain reflectometry based on block matching. 基于块匹配的频率扫描相敏光学时域反射法高精度应变传感。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-06-02 DOI: 10.1364/OE.561207

Haiying Zhao, Wenya Liu, Xianfeng Li, Renpu Li, Andrey Kulikov, Jiubin Tan, Jiwen Cui

{"title":"High-accuracy strain sensing of frequency-scanned phase-sensitive optical time domain reflectometry based on block matching.","authors":"Haiying Zhao, Wenya Liu, Xianfeng Li, Renpu Li, Andrey Kulikov, Jiubin Tan, Jiwen Cui","doi":"10.1364/OE.561207","DOIUrl":"https://doi.org/10.1364/OE.561207","url":null,"abstract":"A strain demodulation method of frequency-scanned ϕ-OTDR based on block matching is proposed, which improves the demodulation performance under short pulse width and large strain. The method of frequency shift estimation based on image block matching improves the similarity between Rayleigh backscattered spectra and the accuracy of demodulation results by combining local frequency domain data and local spatial domain data. The image of the matching degree is denoised by a block-matching three-dimensional filter (BM3D), and the performance is further improved by three-dimensional transformation and collaborative filtering of similar image blocks. The results demonstrate that the frequency shift standard deviations with 10 ns pulse width demodulated by the proposed method are always below 0.0164 GHz (i.e. 0.11με), the overall accuracy is increased by more than 4.25 times compared with Pearson correlation coefficient, Euclidean distance, LMS, Cosine distance, the traditional correlation coefficient. And the accuracy of the large strain is increased by dozens of times. In addition, the root mean square errors of frequency shift with 10 ns pulse width demodulated by the proposed method are always below 0.0685 GHz (i.e., 0.46με), which is 16.76% lower than the aforementioned methods. And the root mean square errors of the results with large strain demodulated by the proposed method are reduced by 77.4% and 90.4% for 20 ns pulse width and 10 ns pulse width, respectively. The proposed method can effectively improve the accuracy of frequency-scanned ϕ-OTDR strain sensing with no hardware modification.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 11","pages":"22534-22553"},"PeriodicalIF":3.2,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144294542","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