物理与天体物理最新文献_第5页

Observability of Modified Threshold Behavior Near Unitarity 修正阈值行为的近统一性观察性

IF 1.8 4区物理与天体物理

Few-Body Systems Pub Date : 2025-09-06 DOI: 10.1007/s00601-025-02007-6

Michael D. Higgins, J. Golak, R. Skibiński, K. Topolnicki, H. Witała, H. Kamada, Chris H. Greene

引用次数: 0

Metasurface‐Embedded Topological Photonic Crystal 超表面嵌入式拓扑光子晶体

IF 11 1区物理与天体物理

Laser & Photonics Reviews Pub Date : 2025-09-06 DOI: 10.1002/lpor.202501032

Haoye Qin, Wenjing Lv, Jue Li, Zijin Yang, Zengping Su, Yuzhi Shi, Bo Li, Patrice Genevet, Qinghua Song

引用次数: 0

Coherent mobile optical fronthaul with source-free remote units and analog phase noise cancellation 具有无源远程单元和模拟相位噪声消除的相干移动光前传

IF 5 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-09-06 DOI: 10.1016/j.optlastec.2025.113689

Miquel Masanas , Rodrigo Méndez , Víctor Polo , Juan C. Velásquez , María C. Santos , Josep Prat

引用次数: 0

Investigation of a free-running dual comb spectrometer with a set of compound correction algorithms 采用复合校正算法的自由运行双梳光谱仪的研究

IF 5 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-09-06 DOI: 10.1016/j.optlastec.2025.113871

Bowen Deng , Su Zhang , Fu Yang , Yan Ning , Wei Long , Xinru Cao , Jiaqi Zhou

{"title":"Investigation of a free-running dual comb spectrometer with a set of compound correction algorithms","authors":"Bowen Deng , Su Zhang , Fu Yang , Yan Ning , Wei Long , Xinru Cao , Jiaqi Zhou","doi":"10.1016/j.optlastec.2025.113871","DOIUrl":"10.1016/j.optlastec.2025.113871","url":null,"abstract":"<div><div>The dual-comb spectrometer (DCS) shows great advantages in high precision multiple gases simultaneous detection due to its wide spectrum, high spectral resolution and fast measurement speed. However, the cumbersome and high-cost phase locking hardware system complicates the DCS system, which limits its application significantly. To address this problem, this paper proposes a set of compound correction algorithms for a free-running DCS system, which successfully realizes the gas spectra restoration. The compound correction algorithms have distinctive advantages including decreasing the jitters within one interferogram (IGM) greatly, correcting the frequency jitters among different IGMs, and further aligning the IGM frames even in the non-central burst part. As a demonstration, we measured the hydrogen cyanide absorption spectrum by using a pair of free-running optical frequency combs with a center wavelength of 1550 nm, bandwidth of 100 nm, pulse repetition rate of about 181 MHz, and frequency difference of about 785 Hz. The measured absorption spectrum agreed well with the HITRAN database. The results showed that the comb spectrum with 43175 frequency comb lines can be restored after applying the compound correction algorithms on 116 interferograms (150 ms). Furthermore, we obtained a coherently averaged IGM frame with a signal-to-noise ratio (SNR) of 4466 in the time domain. The work in this paper shows great promise that the free-running DCS has the potential to be applied in field practice by using the compound correction algorithms.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"192 ","pages":"Article 113871"},"PeriodicalIF":5.0,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145004064","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

Self-organized nanostructures formed by femtosecond laser processing of graphite electrode: Nanogratings, nanoparticles, and nanofilaments 飞秒激光加工石墨电极形成的自组织纳米结构：纳米光栅、纳米粒子和纳米丝

IF 5 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-09-06 DOI: 10.1016/j.optlastec.2025.113873

Sahendra P. Sharma

{"title":"Self-organized nanostructures formed by femtosecond laser processing of graphite electrode: Nanogratings, nanoparticles, and nanofilaments","authors":"Sahendra P. Sharma","doi":"10.1016/j.optlastec.2025.113873","DOIUrl":"10.1016/j.optlastec.2025.113873","url":null,"abstract":"<div><div>This study presents a systematic investigation of the effects of key laser processing parameters; pulse energy, scanning velocity, and beam polarization on the structural and physical properties of laser-induced nanostructures on graphite electrodes. Field Emission Scanning Electron Microscopy (FESEM) analysis demonstrated that pulse energy significantly modulates track width and surface periodicity, whereas scanning velocity inversely correlates with track dimensions. Beam polarization was found to dictate the orientation of Laser-Induced Periodic Surface Structures (LIPSS), enabling precise control over surface patterning. Transmission Electron Microscopy (TEM) of ablation debris revealed spherical (250–300 nm) and filamentous nanoparticles with a propensity for agglomeration. X-ray diffraction analysis indicated laser-induced alterations in crystallinity and defect density, directly impacting the material’s structural integrity. Micro-Raman spectroscopy further confirmed defect generation, evidenced by the progressive broadening of characteristic peaks with increasing pulse energy. These findings offer fundamental insights into laser-matter interactions, facilitating advancements in surface engineering and precision manufacturing.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"192 ","pages":"Article 113873"},"PeriodicalIF":5.0,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145004068","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

Magnetic Properties of Square–Hexagon-Octagon Bilayer Structure with RKKY Interactions: Monte Carlo Simulations 具有RKKY相互作用的方形-六边形-八边形双层结构的磁性：蒙特卡罗模拟

IF 1.7 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-09-06 DOI: 10.1007/s10948-025-07040-4

I. Elhnaki, R. Masrour, T. Sahdane

引用次数: 0

Wigner Path Integral Representation of the Density of States. Monte Carlo Simulation of Plasma Media. 态密度的维格纳路径积分表示。等离子体介质的蒙特卡罗模拟。

IF 1.2 3区物理与天体物理

Journal of Statistical Physics Pub Date : 2025-09-06 DOI: 10.1007/s10955-025-03508-8

Vladimir Filinov, Pavel Levashov, Alexander Larkin

{"title":"Wigner Path Integral Representation of the Density of States. Monte Carlo Simulation of Plasma Media.","authors":"Vladimir Filinov, Pavel Levashov, Alexander Larkin","doi":"10.1007/s10955-025-03508-8","DOIUrl":"10.1007/s10955-025-03508-8","url":null,"abstract":"<div><p>A new phase space path integral representation of quantum density of states (DOS) was derived for a strongly coupled plasma media representing hydrogen plasma and two-component Coulomb system with uniformly distributed in space uncorrelated positive charges (“protons”) simulating a neutralizing background (“OCP”). A path integral Monte Carlo approach was used for the calculation of DOS, energy and momentum distribution functions as well as spin–resolved radial distribution functions (RDFs). The RDFs for electrons with the same spin projection revealed exchange–correlation cavities. For a two-component hydrogen plasma (TCP) the Coulomb attraction results in the appearance of high peaks on the proton–electron RDFs at small interparticle distances, while for the “OCP” the analogous RDFs demonstrate an unexpected significant drop arising due to a three–particle effect caused by the electron repulsion preventing for any two electrons to be in the vicinity of any uncorrelated charge. At negative plasma energy the “OCP” DOS is a fast-decaying function, while in hydrogen plasma at a temperature of the order of 1 <span>(textrm{Ry} = 0.5text {Ha}approx 13.6)</span> eV the DOS shows a well-pronounced peak related to the bound states. Quantum effects make momentum distribution functions non-maxwellian with a power-law high-momentum asymptotics (“quantum tails”) even under the condition of thermodynamic equilibrium.</p></div>","PeriodicalId":667,"journal":{"name":"Journal of Statistical Physics","volume":"192 9","pages":""},"PeriodicalIF":1.2,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144998547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

All-optical polarization inversion in LiNbO3 crystal by two-step illumination using near-infrared femtosecond pulses 近红外飞秒脉冲两步照射下LiNbO3晶体的全光偏振反演

IF 5 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-09-06 DOI: 10.1016/j.optlastec.2025.113872

Xin Chen , Zhou Li , Gordon Han Ying Li , Huan Chen , Junli Wang , Yan Sheng

引用次数: 0

Automatic mode-locked fiber laser based on dual-domain discrimination integrating spectral image classification and pulse sequence recognition 基于光谱图像分类与脉冲序列识别相结合的双域识别自动锁模光纤激光器

IF 5 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-09-06 DOI: 10.1016/j.optlastec.2025.113861

Dongdong Han, Zixuan Li, Qianyu Hu, Yihang Lu, Kaili Ren, Xiuxia Cai, Jiewei Jiang, Tiantian Li, Zhanqiang Hui

{"title":"Automatic mode-locked fiber laser based on dual-domain discrimination integrating spectral image classification and pulse sequence recognition","authors":"Dongdong Han, Zixuan Li, Qianyu Hu, Yihang Lu, Kaili Ren, Xiuxia Cai, Jiewei Jiang, Tiantian Li, Zhanqiang Hui","doi":"10.1016/j.optlastec.2025.113861","DOIUrl":"10.1016/j.optlastec.2025.113861","url":null,"abstract":"<div><div>An adaptive genetic algorithm integrating dual-domain discrimination of spectral image classification and pulse sequence recognition is proposed to achieve mode-locked for generating mode-locked pulses in a nonlinear polarization rotation based fiber laser. Convolutional neural network classification model is constructed using spectral images captured from the laser output. The model outputs spectral classification results and combines them with time-domain information from an oscilloscope using a dual-region counting method, forming a composite fitness function to evaluate the intracavity state. Then, an adaptive genetic algorithm is used to optimize the electric polarization controller, enabling the classification of pulses into mode-locked state and non-mode-locked state. After 50 tests, stable mode-locked state was achieved on average within 3 generations, with a 90% probability of mode-locked within 5 generations. Tests on fiber lasers with various polarization states showed that 87% achieved mode-locked within 5 generations. This study offers a novel approach to achieving stable output in automatic mode-locked fiber lasers.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"192 ","pages":"Article 113861"},"PeriodicalIF":5.0,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145004065","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

Anisotropic Spacetimes in f(G)-gravity: Bianchi I, Bianchi III and Kantowski-Sachs Cosmologies f(G)-重力中的各向异性时空：Bianchi I， Bianchi III和Kantowski-Sachs宇宙论

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2025-09-06 DOI: 10.1007/s10714-025-03465-3

R. S. Bogadi, A. Giacomini, M. Govender, C. Hansraj, G. Leon, A. Paliathanasis

{"title":"Anisotropic Spacetimes in f(G)-gravity: Bianchi I, Bianchi III and Kantowski-Sachs Cosmologies","authors":"R. S. Bogadi, A. Giacomini, M. Govender, C. Hansraj, G. Leon, A. Paliathanasis","doi":"10.1007/s10714-025-03465-3","DOIUrl":"10.1007/s10714-025-03465-3","url":null,"abstract":"<div><p>We investigate the evolution of cosmological anisotropies within the framework of <span>(fleft( Gright) )</span>-gravity. Specifically, we consider a locally rotationally symmetric geometry in four-dimensional spacetime that describes the Bianchi I, Bianchi III, and the Kantowski-Sachs spacetimes. Within this context, we introduce a Lagrange multiplier which allows us to reformulate the geometric degrees of freedom in terms of a scalar field. The resulting theory is dynamically equivalent to an Einstein-Gauss-Bonnet scalar field model. We normalize the field equations by introducing dimensionless variables. The dynamics of our system is then explored by solving the resulting nonlinear differential equations numerically for various sets of initial conditions. Our analysis reveals the existence of two finite attractors: the Minkowski universe and an isotropic, spatially flat solution capable of describing accelerated expansion. Although de Sitter expansion may be recovered, it appears only as an unstable solution. In addition, the theory suffers from the existence of Big Rip singularities.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 9","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145005490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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