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Nonlinear branched flow of intense laser light in randomly uneven media 强激光在随机不均匀介质中的非线性分支流动
IF 5.1 1区 物理与天体物理
Matter and Radiation at Extremes Pub Date : 2023-03-01 DOI: 10.1063/5.0133707
K. Jiang, T. W. Huang, C. N. Wu, M. Yu, H. Zhang, S. Z. Wu, H. Zhuo, A. Pukhov, C. Zhou, S. Ruan
{"title":"Nonlinear branched flow of intense laser light in randomly uneven media","authors":"K. Jiang, T. W. Huang, C. N. Wu, M. Yu, H. Zhang, S. Z. Wu, H. Zhuo, A. Pukhov, C. Zhou, S. Ruan","doi":"10.1063/5.0133707","DOIUrl":"https://doi.org/10.1063/5.0133707","url":null,"abstract":"Branched flow is an interesting phenomenon that can occur in diverse systems. It is usually linear in the sense that the flow does not alter the properties of the medium. Branched flow of light on thin films has recently been discovered. It is therefore of interest to know whether nonlinear light branching can also occur. Here, using particle-in-cell simulations, we find that in the case of an intense laser propagating through a randomly uneven medium, cascading local photoionization by the incident laser, together with the response of freed electrons in the strong laser fields, triggers space–time-dependent optical unevenness. The resulting branching pattern depends dramatically on the laser intensity. That is, the branching here is distinct from the existing linear ones. The observed branching properties agree well with theoretical analyses based on the Helmholtz equation. Nonlinear branched propagation of intense lasers potentially opens up a new area for laser–matter interaction and may be relevant to other branching phenomena of a nonlinear nature.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"65 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83400219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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: 1
Generation of high intensity speckles in overlapping laser beams 在重叠的激光光束中产生高强度斑点
IF 5.1 1区 物理与天体物理
Matter and Radiation at Extremes Pub Date : 2023-03-01 DOI: 10.1063/5.0123585
L. Hao, J. Qiu, W. Huo
{"title":"Generation of high intensity speckles in overlapping laser beams","authors":"L. Hao, J. Qiu, W. Huo","doi":"10.1063/5.0123585","DOIUrl":"https://doi.org/10.1063/5.0123585","url":null,"abstract":"A new mechanism for the generation of high intensity speckles by coupling of overlapping beams is discovered and studied in detail. Using three-dimensional simulations, the coupling of overlapping beams smoothed by phase plates and by polarization smoothing are investigated in the regime relevant to inertial confinement fusion studies. It is found that the intensity distribution of the laser beam spot can be changed by nonuniform spatial phase modulation, and the speckles formed by the phase plate can be split into smaller speckles with higher intensities, which is favorable for the generation of laser plasma instabilities. Stimulated Brillouin scattering is compared in simulations with and without coupling of the overlapping incident beams, and the results confirm the enhancement of stimulated Brillouin scattering due to this mechanism.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"10 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88666686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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: 1
Plasma optics: A perspective for high-power coherent light generation and manipulation 等离子体光学:高功率相干光产生和操作的前景
IF 5.1 1区 物理与天体物理
Matter and Radiation at Extremes Pub Date : 2023-03-01 DOI: 10.1063/5.0138996
C. Riconda, S. Weber
{"title":"Plasma optics: A perspective for high-power coherent light generation and manipulation","authors":"C. Riconda, S. Weber","doi":"10.1063/5.0138996","DOIUrl":"https://doi.org/10.1063/5.0138996","url":null,"abstract":"Over the last two decades, the importance of fully ionized plasmas for the controlled manipulation of high-power coherent light has increased considerably. Many ideas have been put forward on how to control or change the properties of laser pulses such as their frequency, spectrum, intensity, and polarization. The corresponding interaction with a plasma can take place either in a self-organizing way or by prior tailoring. Considerable work has been done in theoretical studies and in simulations, but at present there is a backlog of demand for experimental verification and the associated detailed characterization of plasma-optical elements. Existing proof-of-principle experiments need to be pushed to higher power levels. There is little doubt that plasmas have huge potential for future use in high-power optics. This introduction to the special issue of Matter and Radiation at Extremes devoted to plasma optics sets the framework, gives a short historical overview, and briefly describes the various articles in this collection.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"7 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84161482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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: 1
In situ high-pressure wide-angle hard x-ray photon correlation spectroscopy: A versatile tool probing atomic dynamics of extreme condition matter 原位高压广角硬x射线光子相关光谱学:探测极端条件物质原子动力学的通用工具
IF 5.1 1区 物理与天体物理
Matter and Radiation at Extremes Pub Date : 2023-03-01 DOI: 10.1063/5.0146660
Q. Zeng
{"title":"In situ high-pressure wide-angle hard x-ray photon correlation spectroscopy: A versatile tool probing atomic dynamics of extreme condition matter","authors":"Q. Zeng","doi":"10.1063/5.0146660","DOIUrl":"https://doi.org/10.1063/5.0146660","url":null,"abstract":"With the advent of new synchrotron radiation x-ray sources that provide a significantly enhanced coherent flux, high-energy x-ray photon correlation spectroscopy measurements can be performed on materials in a diamond anvil cell. Essential information on atomic dynamics that was previously inaccessible can be obtained for various novel phenomena emerging under extreme conditions. This article discusses the importance, feasibility, and experimental details of this technique, as well as the opportunities that it offers to address critical scientific challenges.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"38 4","pages":""},"PeriodicalIF":5.1,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72481898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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: 2
Restoration of the focal parameters for an extreme-power laser pulse with ponderomotively scattered proton spectra by using a neural network algorithm 用神经网络算法恢复具有重运动散射质子谱的极功率激光脉冲的焦点参数
IF 5.1 1区 物理与天体物理
Matter and Radiation at Extremes Pub Date : 2023-01-01 DOI: 10.1063/5.0126571
N. Bukharskii, O. E. Vais, P. Korneev, V. Bychenkov
{"title":"Restoration of the focal parameters for an extreme-power laser pulse with ponderomotively scattered proton spectra by using a neural network algorithm","authors":"N. Bukharskii, O. E. Vais, P. Korneev, V. Bychenkov","doi":"10.1063/5.0126571","DOIUrl":"https://doi.org/10.1063/5.0126571","url":null,"abstract":"A neural network-based approach is proposed both for reconstructing the focal spot intensity profile and for estimating the peak intensity of a high-power tightly focused laser pulse using the angular energy distributions of protons accelerated by the pulse from rarefied gases. For these purposes, we use a convolutional neural network architecture. Training and testing datasets are calculated using the test particle method, with the laser description in the form of Stratton–Chu integrals, which model laser pulses focused by an off-axis parabolic mirror down to the diffraction limit. To demonstrate the power and robustness of this method, we discuss the reconstruction of axially symmetric intensity profiles for laser pulses with intensities and focal diameters in the ranges of 1021–1023 W cm−2 and ∼(1–4) λ, respectively. This approach has prospects for implementation at higher intensities and with asymmetric laser beams, and it can provide a valuable diagnostic method for emerging extremely intense laser facilities.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"18 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85324512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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: 3
Ultraintense few-cycle infrared laser generation by fast-extending plasma grating 快速扩展等离子体光栅产生超强少周期红外激光
IF 5.1 1区 物理与天体物理
Matter and Radiation at Extremes Pub Date : 2023-01-01 DOI: 10.1063/5.0119868
Zhaoli Li, Y. Zuo, X. Zeng, Zhaohui Wu, Xiao-dong Wang, Xiao Wang, J. Mu, B. Hu
{"title":"Ultraintense few-cycle infrared laser generation by fast-extending plasma grating","authors":"Zhaoli Li, Y. Zuo, X. Zeng, Zhaohui Wu, Xiao-dong Wang, Xiao Wang, J. Mu, B. Hu","doi":"10.1063/5.0119868","DOIUrl":"https://doi.org/10.1063/5.0119868","url":null,"abstract":"Ultraintense short-period infrared laser pulses play an important role in frontier scientific research, but their power is quite low when generated using current technology. This paper demonstrates a scheme for generating an ultraintense few-cycle infrared pulse by directly compressing a long infrared pulse. In this scheme, an infrared picosecond-to-nanosecond laser pulse counterpropagates with a rapidly extending plasma grating that is created by ionizing an undulated gas by a short laser pulse, and the infrared laser pulse is reflected by the rapidly extending plasma grating. Because of the high expansion velocity of the latter, the infrared laser pulse is compressed in the reflection process. One- and two-dimensional particle-in-cell simulations show that by this method, a pulse with a duration of tens of picoseconds in the mid- to far-infrared range can be compressed to a few cycles with an efficiency exceeding 60%, thereby making ultraintense few-cycle infrared pulses possible.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"60 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84017445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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: 1
Inverse Faraday effect of weakly relativistic full Poincaré beams in plasma 等离子体中弱相对论性全庞卡洛光束的反法拉第效应
IF 5.1 1区 物理与天体物理
Matter and Radiation at Extremes Pub Date : 2023-01-01 DOI: 10.1063/5.0120072
Wei Liu, Q. Jia, Jian Zheng
{"title":"Inverse Faraday effect of weakly relativistic full Poincaré beams in plasma","authors":"Wei Liu, Q. Jia, Jian Zheng","doi":"10.1063/5.0120072","DOIUrl":"https://doi.org/10.1063/5.0120072","url":null,"abstract":"The inverse Faraday effect (IFE), which usually refers to the phenomenon in which a quasi-static axial magnetic field is self-generated when a circularly polarized beam propagates in a plasma, has rarely been studied for lasers with unconventional polarization states. In this paper, IFE is reconsidered for weakly relativistic full Poincaré beams, which can contain all possible laser polarization states. Starting from cold electron fluid equations and the conservation of generalized vorticity, a self-consistent theoretical model combining the nonlinear azimuthal current and diamagnetic current is presented. The theoretical results show that when such a laser propagates in a plasma, an azimuthally varying quasi-static axial magnetic field can be generated, which is quite different from the circularly polarized case. These results are qualitatively and quantitatively verified by three-dimensional particle-in-cell simulations. Our work extends the theoretical understanding of the IFE and provides a new degree of freedom in the design of magnetized plasma devices.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"20 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75233714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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: 2
Overcritical electron acceleration and betatron radiation in the bubble-like structure formed by re-injected electrons in a tailored transverse plasma 定制横向等离子体中再注入电子形成的泡状结构中的过临界电子加速和电子辐射
IF 5.1 1区 物理与天体物理
Matter and Radiation at Extremes Pub Date : 2023-01-01 DOI: 10.1063/5.0121558
Yuan Zhao, Haiyang Lu, Cang-tao Zhou, Jungao Zhu
{"title":"Overcritical electron acceleration and betatron radiation in the bubble-like structure formed by re-injected electrons in a tailored transverse plasma","authors":"Yuan Zhao, Haiyang Lu, Cang-tao Zhou, Jungao Zhu","doi":"10.1063/5.0121558","DOIUrl":"https://doi.org/10.1063/5.0121558","url":null,"abstract":"We present a novel scheme for dense electron acceleration driven by the laser irradiation of a near-critical-density plasma. The electron reflux effect in a transversely tailored plasma is particularly enhanced in the area of peak density. We observe a bubble-like distribution of re-injected electrons, which forms a strong quasistatic electromagnetic field that can accelerate electrons longitudinally while also preserving the electron transverse emittance. Simulation results demonstrate that over-dense electrons could be trapped in such an artificial bubble and accelerated to an energy of [Formula: see text]. The obtained relativistic electron beam can reach a total charge of up to 0.26 nC and is well collimated with a small divergence of 17 mrad. Moreover, the wavelength of electron oscillation is noticeably reduced due to the shaking of the bubble structure in the laser field. As a result, the energy of the produced photons is substantially increased to the γ range. This new regime provides a path to generating high-charge electron beams and high-energy γ-ray sources.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"27 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79437509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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: 1
Effect of ablation on the nonlinear spike growth for the single-mode ablative Rayleigh–Taylor instability 烧蚀对单模烧蚀瑞利-泰勒不稳定性非线性尖峰生长的影响
IF 5.1 1区 物理与天体物理
Matter and Radiation at Extremes Pub Date : 2023-01-01 DOI: 10.1063/5.0106832
J. Fu, H. Zhang, H. Cai, P. Yao, S. P. Zhu
{"title":"Effect of ablation on the nonlinear spike growth for the single-mode ablative Rayleigh–Taylor instability","authors":"J. Fu, H. Zhang, H. Cai, P. Yao, S. P. Zhu","doi":"10.1063/5.0106832","DOIUrl":"https://doi.org/10.1063/5.0106832","url":null,"abstract":"The effect of ablation on the nonlinear spike growth of single-mode ablative Rayleigh–Taylor instability (RTI) is studied by two-dimensional numerical simulations. It is shown that the ablation can reduce the quasi-constant velocity and significantly suppress the reacceleration of the spike in the nonlinear phase. It is also shown that the spike growth can affect the ablation-generated vorticity inside the bubble, which further affects the nonlinear bubble acceleration. The vorticity evolution is found to be correlated with the mixing width (i.e., the sum of the bubble and spike growths) for a given wave number and ablation velocity. By considering the effects of mass ablation and vorticity, an analytical model for the nonlinear bubble and spike growth of single-mode ablative RTI is developed in this study. It is found that the nonlinear growth of the mixing width, induced by the single mode, is dominated by the bubble growth for small-scale ablative RTI, whereas it is dominated by the spike growth for classical RTI.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"15 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79931242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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: 5
Diagnosis of ultrafast ultraintense laser pulse characteristics by machine-learning-assisted electron spin 利用机器学习辅助电子自旋诊断超快超强激光脉冲特性
IF 5.1 1区 物理与天体物理
Matter and Radiation at Extremes Pub Date : 2022-12-31 DOI: 10.1063/5.0140828
Zhijie Lu, X. Hou, F. Wan, Y. Salamin, C. Lv, Bo Zhang, Feijie Wang, Zhongxun Xu, Jian-Xing Li
{"title":"Diagnosis of ultrafast ultraintense laser pulse characteristics by machine-learning-assisted electron spin","authors":"Zhijie Lu, X. Hou, F. Wan, Y. Salamin, C. Lv, Bo Zhang, Feijie Wang, Zhongxun Xu, Jian-Xing Li","doi":"10.1063/5.0140828","DOIUrl":"https://doi.org/10.1063/5.0140828","url":null,"abstract":"The rapid development of ultrafast ultraintense laser technology continues to create opportunities for studying strong-field physics under extreme conditions. However, accurate determination of the spatial and temporal characteristics of a laser pulse is still a great challenge, especially when laser powers higher than hundreds of terawatts are involved. In this paper, by utilizing the radiative spin-flip effect, we find that the spin depolarization of an electron beam can be employed to diagnose characteristics of ultrafast ultraintense lasers with peak intensities around 1020–1022 W/cm2. With three shots, our machine-learning-assisted model can predict, simultaneously, the pulse duration, peak intensity, and focal radius of a focused Gaussian ultrafast ultraintense laser (in principle, the profile can be arbitrary) with relative errors of 0.1%–10%. The underlying physics and an alternative diagnosis method (without the assistance of machine learning) are revealed by the asymptotic approximation of the final spin degree of polarization. Our proposed scheme exhibits robustness and detection accuracy with respect to fluctuations in the electron beam parameters. Accurate measurements of ultrafast ultraintense laser parameters will lead to much higher precision in, for example, laser nuclear physics investigations and laboratory astrophysics studies. Robust machine learning techniques may also find applications in more general strong-field physics scenarios.","PeriodicalId":54221,"journal":{"name":"Matter and Radiation at Extremes","volume":"19 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74678941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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: 1
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