E. Vishnyakov, D. Mai, J. Green, A. Mondal, A. Jancarek, Petr Zimmermann, Sebastian Niekrasz, Srimanta Maity, A. Molodozhentsev
A compact undulator-based soft X-ray radiation source furnishing the laser wakefield electron acceleration concept is currently being developed at ELI-Beamlines in the Czech Republic. It will bring to the user community a high-repetition-rate (up to 50 Hz) soft X-ray radiation to enable high-temporal-resolution pump-probe experiments, combined with XANES spectroscopy, high-resolution microscopy, investigations of biological molecules and chemical reactions, evaluation of soft X-ray multilayer optics, as well as with coherent radiation applications like ptychography or coherent diffraction imaging, at later development stages. Now the first stage called LUIS is under development, which will result in production of uncoherent radiation in the ‘water window’ spectral range. The next stages will enable coherent extreme ultraviolet and soft X-ray radiation. We present suggestions on the user-oriented program to the community.
{"title":"Compact undulator-based soft x-ray radiation source at ELI Beamlines: user-oriented program","authors":"E. Vishnyakov, D. Mai, J. Green, A. Mondal, A. Jancarek, Petr Zimmermann, Sebastian Niekrasz, Srimanta Maity, A. Molodozhentsev","doi":"10.1117/12.2665377","DOIUrl":"https://doi.org/10.1117/12.2665377","url":null,"abstract":"A compact undulator-based soft X-ray radiation source furnishing the laser wakefield electron acceleration concept is currently being developed at ELI-Beamlines in the Czech Republic. It will bring to the user community a high-repetition-rate (up to 50 Hz) soft X-ray radiation to enable high-temporal-resolution pump-probe experiments, combined with XANES spectroscopy, high-resolution microscopy, investigations of biological molecules and chemical reactions, evaluation of soft X-ray multilayer optics, as well as with coherent radiation applications like ptychography or coherent diffraction imaging, at later development stages. Now the first stage called LUIS is under development, which will result in production of uncoherent radiation in the ‘water window’ spectral range. The next stages will enable coherent extreme ultraviolet and soft X-ray radiation. We present suggestions on the user-oriented program to the community.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123114280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
O. Turkot, F. Dall'Antonia, Richard Bean, J. E, H. Fangohr, D. E. Ferreira de Lima, S. Kantamneni, H. Kirkwood, F. Koua, A. Mancuso, D. Melo, A. Round, Egor Sobolev, R. de Wijn, James J. Wrigley, L. Gelisio
In this paper we introduce and discuss the EXtra-Xwiz pipeline for the semi-automated analysis of serial femtosecond crystallography data collected at the European XFEL. EXtra-Xwiz wraps the CrystFEL software suite, exposes data in a CrystFEL-compliant format, handles the interaction with the local high-performance computing cluster and simplifies certain experiment schemes such as the pump-probe one. Alongside with the integration of EXtra-Xwiz into the European XFEL ecosystem, future plans and developments are also briefly discussed.
{"title":"Towards automated analysis of serial crystallography data at the European XFEL","authors":"O. Turkot, F. Dall'Antonia, Richard Bean, J. E, H. Fangohr, D. E. Ferreira de Lima, S. Kantamneni, H. Kirkwood, F. Koua, A. Mancuso, D. Melo, A. Round, Egor Sobolev, R. de Wijn, James J. Wrigley, L. Gelisio","doi":"10.1117/12.2669569","DOIUrl":"https://doi.org/10.1117/12.2669569","url":null,"abstract":"In this paper we introduce and discuss the EXtra-Xwiz pipeline for the semi-automated analysis of serial femtosecond crystallography data collected at the European XFEL. EXtra-Xwiz wraps the CrystFEL software suite, exposes data in a CrystFEL-compliant format, handles the interaction with the local high-performance computing cluster and simplifies certain experiment schemes such as the pump-probe one. Alongside with the integration of EXtra-Xwiz into the European XFEL ecosystem, future plans and developments are also briefly discussed.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131896725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. Vicario, C. Arrell, S. Bettoni, A. Dax, P. Dijkstal, M. Huppert, P. Johnson, A. Lutman, E. Prat Costa, S. Reiche, A. Trisorio
Two-color is an emerging mode of operation in x-ray Free Electron Laser (FEL) having the potential to expand the pump and probe experiments toward fs temporal resolution and to site-selective spectroscopy. A novel and quick to setup method for two-color x-ray generation is presented here. The approach is experimentally demonstrated at the hard x-ray branch of SwissFEL (Aramis) using a laser emittance spoiler(LES). A short laser pulse is overlapped at the peak of the primary photocathode laser causing a local increase of the electron bunch emittance. In this configuration, the x-ray FEL emission occurs only for the two unspoiled parts of the bunch. Due to the fact that the electron bunch acquires an energy chirp along the acceleration, the spoiled beam produces two x-ray pulses of individual duration of few tens of fs having 1% photon energy separation and a time delay controllable up to 100 fs. Different from other techniques, the present method relies on the standard FEL configuration and it does not require a dedicated accelerator and undulator setting. With the LES, we achieved high efficiency, high energy and spectral stability paired to an independent control of the duration and of the relative intensity of the two colors. The LES enables shot-to-shot switching between one and two-color FEL and further, it is compatible with high repetition-rate FELs, as it is not associated to electron beam losses such as in other two-color methods.
{"title":"Demonstration of two-color x-ray FEL by laser emittance spoiler","authors":"C. Vicario, C. Arrell, S. Bettoni, A. Dax, P. Dijkstal, M. Huppert, P. Johnson, A. Lutman, E. Prat Costa, S. Reiche, A. Trisorio","doi":"10.1117/12.2665579","DOIUrl":"https://doi.org/10.1117/12.2665579","url":null,"abstract":"Two-color is an emerging mode of operation in x-ray Free Electron Laser (FEL) having the potential to expand the pump and probe experiments toward fs temporal resolution and to site-selective spectroscopy. A novel and quick to setup method for two-color x-ray generation is presented here. The approach is experimentally demonstrated at the hard x-ray branch of SwissFEL (Aramis) using a laser emittance spoiler(LES). A short laser pulse is overlapped at the peak of the primary photocathode laser causing a local increase of the electron bunch emittance. In this configuration, the x-ray FEL emission occurs only for the two unspoiled parts of the bunch. Due to the fact that the electron bunch acquires an energy chirp along the acceleration, the spoiled beam produces two x-ray pulses of individual duration of few tens of fs having 1% photon energy separation and a time delay controllable up to 100 fs. Different from other techniques, the present method relies on the standard FEL configuration and it does not require a dedicated accelerator and undulator setting. With the LES, we achieved high efficiency, high energy and spectral stability paired to an independent control of the duration and of the relative intensity of the two colors. The LES enables shot-to-shot switching between one and two-color FEL and further, it is compatible with high repetition-rate FELs, as it is not associated to electron beam losses such as in other two-color methods.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128255269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The process of high-harmonic generation from solid density surfaces results in a train of ultrashort attosecond pulses. Isolating a single attosecond pulse is of interest for many reasons such as atomic and molecular time-scale pump-probe experiments.1 We highlight, via Particle-in-Cell simulations, a viable route to pulse isolation using two colour fields with off integer harmonic frequencies, which allows subtle shaping of the incident laser field which when reflected by the plasma mirror, diminishes some pulses in the train resulting in the potential to isolate a single attosecond pulse.
{"title":"Attosecond pulse generation using incommensurate two-colour fields","authors":"Colm Fitzpatrick, B. Dromey, M. Yeung","doi":"10.1117/12.2665621","DOIUrl":"https://doi.org/10.1117/12.2665621","url":null,"abstract":"The process of high-harmonic generation from solid density surfaces results in a train of ultrashort attosecond pulses. Isolating a single attosecond pulse is of interest for many reasons such as atomic and molecular time-scale pump-probe experiments.1 We highlight, via Particle-in-Cell simulations, a viable route to pulse isolation using two colour fields with off integer harmonic frequencies, which allows subtle shaping of the incident laser field which when reflected by the plasma mirror, diminishes some pulses in the train resulting in the potential to isolate a single attosecond pulse.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"252 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132702974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Raclavský, K. H. Rao, M. Lamač, U. Chaulagain, J. Nejdl
We present a four-pass tomography setup for the characterization of the density distribution of a gas jet. The data acquired with a wavefront sensor is processed using a tomography algorithm, providing a 3D reconstruction of the gas density distribution. We applied this technique to characterize a supersonic gas jet produced by a de Laval nozzle and obstructed by a razor blade in ambient pressure, which are among the common targets used in high-repetition rate laser wakefield acceleration (LWFA) experiments. The results revealed the complex density distribution of the jet, including the formation of barrel shocks. The four-pass tomography setup with a wavefront sensor provides a valuable tool for the detailed characterization of gas jets, enabling the investigation of fundamental fluid mechanics phenomena and contributing to the development of advanced propulsion systems and LWFA gas targets.
{"title":"Advanced measurement of gas jet density using a wavefront sensor","authors":"M. Raclavský, K. H. Rao, M. Lamač, U. Chaulagain, J. Nejdl","doi":"10.1117/12.2665686","DOIUrl":"https://doi.org/10.1117/12.2665686","url":null,"abstract":"We present a four-pass tomography setup for the characterization of the density distribution of a gas jet. The data acquired with a wavefront sensor is processed using a tomography algorithm, providing a 3D reconstruction of the gas density distribution. We applied this technique to characterize a supersonic gas jet produced by a de Laval nozzle and obstructed by a razor blade in ambient pressure, which are among the common targets used in high-repetition rate laser wakefield acceleration (LWFA) experiments. The results revealed the complex density distribution of the jet, including the formation of barrel shocks. The four-pass tomography setup with a wavefront sensor provides a valuable tool for the detailed characterization of gas jets, enabling the investigation of fundamental fluid mechanics phenomena and contributing to the development of advanced propulsion systems and LWFA gas targets.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123052656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Deciccio, Keith Bisogno, B. Adams, G. Barbiero, M. Rampp, T. Metzger, C. Rose-Petruck
We demonstrate High-Energy X-ray (HEX-ray) generation using 2.8-mJ, 850fs pulses on a liquid metal target in a Laser Plasma X-ray Source (LPXS). The measured HEX-ray spectra reach into the MeV spectral range. The spectra follow Boltzmann energy distributions with a maximum HEX-ray “temperature” of 420 keV. The low laser intensity requirement, orders of magnitude less than previously reported, enables operation with widely available picosecond, millijoule laser systems with hundreds of Watt average laser power. Based on lasers with Yb-doped active media, HEX-ray sources driven with kilowatt average laser power are achievable in the very near future.
{"title":"Generation of MeV x-rays with 3-mJ, picosecond laser pulses","authors":"D. Deciccio, Keith Bisogno, B. Adams, G. Barbiero, M. Rampp, T. Metzger, C. Rose-Petruck","doi":"10.1117/12.2666404","DOIUrl":"https://doi.org/10.1117/12.2666404","url":null,"abstract":"We demonstrate High-Energy X-ray (HEX-ray) generation using 2.8-mJ, 850fs pulses on a liquid metal target in a Laser Plasma X-ray Source (LPXS). The measured HEX-ray spectra reach into the MeV spectral range. The spectra follow Boltzmann energy distributions with a maximum HEX-ray “temperature” of 420 keV. The low laser intensity requirement, orders of magnitude less than previously reported, enables operation with widely available picosecond, millijoule laser systems with hundreds of Watt average laser power. Based on lasers with Yb-doped active media, HEX-ray sources driven with kilowatt average laser power are achievable in the very near future.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131444698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Bogdan Alexandru Sava, I. Sandu, B. Calin, L. Boroica, A. Filip, M. C. Dinca, A. Trefilov, C. Fleaca, M. Dumitru, M. Zamfirescu, D. Ulieru
The optical effects were obtained by three different ways, which are opal structures, laser polymerizing and plasmonic ultrathin Ag films deposition. Opal structures were realized by deposition of a thin layer composed of sub-micron spheres of polystyrene on the surface of an optical fiber using drop-drying method and capillary method. Multiple diffraction gratings have been designed and obtained on mechanically processed optical fiber, through means of Two-Photon Polymerization via laser direct writing (3D Lithography - 3DL). Ultrathin Ag films of 1 to 9 nm thickness were deposited by RF Magnetron Sputtering onto different substrates.
{"title":"Optical effects by opal/reverse opal structures, laser polymerizing and plasmonic Ag ultra-thin films","authors":"Bogdan Alexandru Sava, I. Sandu, B. Calin, L. Boroica, A. Filip, M. C. Dinca, A. Trefilov, C. Fleaca, M. Dumitru, M. Zamfirescu, D. Ulieru","doi":"10.1117/12.2682701","DOIUrl":"https://doi.org/10.1117/12.2682701","url":null,"abstract":"The optical effects were obtained by three different ways, which are opal structures, laser polymerizing and plasmonic ultrathin Ag films deposition. Opal structures were realized by deposition of a thin layer composed of sub-micron spheres of polystyrene on the surface of an optical fiber using drop-drying method and capillary method. Multiple diffraction gratings have been designed and obtained on mechanically processed optical fiber, through means of Two-Photon Polymerization via laser direct writing (3D Lithography - 3DL). Ultrathin Ag films of 1 to 9 nm thickness were deposited by RF Magnetron Sputtering onto different substrates.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"49 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131623879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yousuf Hemani, H. Panuganti, M. Galimberti, Davide Bleiner
Empulse is the Swiss table-top near-infrared (λ = 1050 nm) laser system that aims to produce 10-TW class pulses through chirped pulse amplification. The system offers a flexible platform for a number of experiments in materials science, such as advanced spectroscopy and/or materials under extreme conditions. The technical design report (TDR) is presented, highlighting the system architecture and performance. This TDR gives a general overview of the Empulse system and updates on developments towards realization of a joule-class ∼ps-scale short pulse output. In particular, the laser system timing diagram, safety interlock scheme, the front-end pulse jitter characterization, and finally the group delay dispersion (GDD) calculations of the stretcher and compressor optics are presented. The system is complemented by a number of dedicated diagnostics and realtime-monitoring, as reported in the paper by Hemani et al. in this proceedings.
{"title":"Technical design report of EMPULSE","authors":"Yousuf Hemani, H. Panuganti, M. Galimberti, Davide Bleiner","doi":"10.1117/12.2665575","DOIUrl":"https://doi.org/10.1117/12.2665575","url":null,"abstract":"Empulse is the Swiss table-top near-infrared (λ = 1050 nm) laser system that aims to produce 10-TW class pulses through chirped pulse amplification. The system offers a flexible platform for a number of experiments in materials science, such as advanced spectroscopy and/or materials under extreme conditions. The technical design report (TDR) is presented, highlighting the system architecture and performance. This TDR gives a general overview of the Empulse system and updates on developments towards realization of a joule-class ∼ps-scale short pulse output. In particular, the laser system timing diagram, safety interlock scheme, the front-end pulse jitter characterization, and finally the group delay dispersion (GDD) calculations of the stretcher and compressor optics are presented. The system is complemented by a number of dedicated diagnostics and realtime-monitoring, as reported in the paper by Hemani et al. in this proceedings.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"12582 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128784439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Matys, K. Mima, T. Jeong, O. Klimo, J. Psikal, S. V. Bulanov
The interaction of high-intensity PW-class laser pulses with ultra-thin (tens of nm) foils provides interesting research conditions of high radiation pressure, strong self-generated magnetic fields and laser diffraction on generated aperture. When the laser pulse is transmitted through such a medium, its intensity profile can be enhanced, including generation of a steep-rising front, local intensity increase and improvement of its contrast. The use of a circularly polarized laser pulse is especially interesting in this setup, as the transmitted laser pulse can obtain a spiral-like intensity space profile. The structure is also transferred into the electron density profile of the expanded thin foil. In this work we compared the cases of linearly and circularly polarized laser pulse with the help of 3D particlein-cell simulations in interaction of an ultra-thin foil (plasma shutter) and the subsequent ion acceleration from the following target. The addition of the plasma shutter resulted in a generation of a spiral-like pulse in the case of circular polarization, significant reduction of the divergence of generated ion beam in the case of linear polarization and increase of maximal ion energy in both cases.
{"title":"Spiral pulse generation and subsequent ion acceleration via ultra-thin foil and circularly polarized laser pulse","authors":"M. Matys, K. Mima, T. Jeong, O. Klimo, J. Psikal, S. V. Bulanov","doi":"10.1117/12.2665679","DOIUrl":"https://doi.org/10.1117/12.2665679","url":null,"abstract":"The interaction of high-intensity PW-class laser pulses with ultra-thin (tens of nm) foils provides interesting research conditions of high radiation pressure, strong self-generated magnetic fields and laser diffraction on generated aperture. When the laser pulse is transmitted through such a medium, its intensity profile can be enhanced, including generation of a steep-rising front, local intensity increase and improvement of its contrast. The use of a circularly polarized laser pulse is especially interesting in this setup, as the transmitted laser pulse can obtain a spiral-like intensity space profile. The structure is also transferred into the electron density profile of the expanded thin foil. In this work we compared the cases of linearly and circularly polarized laser pulse with the help of 3D particlein-cell simulations in interaction of an ultra-thin foil (plasma shutter) and the subsequent ion acceleration from the following target. The addition of the plasma shutter resulted in a generation of a spiral-like pulse in the case of circular polarization, significant reduction of the divergence of generated ion beam in the case of linear polarization and increase of maximal ion energy in both cases.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131033687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The development of laser technologies to produce extreme intensities has allowed the generation of high-order harmonics from relativistic laser-plasma mirror interactions to become attainable to observe experimentally. Numerical plasma simulations are invaluable for understanding the dynamic processes underpinning this mechanism. However, accuracy in describing high-frequency electromagnetic waves is challenging. Finite Difference Time Domain methods give rise to numerical dispersion when used to solve Maxwell’s equations, inducing a dispersive change in vacuum refractive index, which causes significant errors in physical properties of the reflected field, such as an angular deviation in the harmonic spatial profiles from the predicted specular reflection. EPOCH Particle-In-Cell (PIC) code is used to perform two-dimensional (2D) simulations to extensively study and control the effects of numerical dispersion on the generated harmonics for several Maxwell solvers. Effects on angular deviation across a range of angles of incidence and strategies to mitigate dispersive effects via controlling interaction geometry are discussed.
{"title":"Study and control of the effects of numerical dispersion on plasma simulations of relativistic high harmonic generation","authors":"Holly Huddleston, B. Dromey, M. Yeung","doi":"10.1117/12.2665655","DOIUrl":"https://doi.org/10.1117/12.2665655","url":null,"abstract":"The development of laser technologies to produce extreme intensities has allowed the generation of high-order harmonics from relativistic laser-plasma mirror interactions to become attainable to observe experimentally. Numerical plasma simulations are invaluable for understanding the dynamic processes underpinning this mechanism. However, accuracy in describing high-frequency electromagnetic waves is challenging. Finite Difference Time Domain methods give rise to numerical dispersion when used to solve Maxwell’s equations, inducing a dispersive change in vacuum refractive index, which causes significant errors in physical properties of the reflected field, such as an angular deviation in the harmonic spatial profiles from the predicted specular reflection. EPOCH Particle-In-Cell (PIC) code is used to perform two-dimensional (2D) simulations to extensively study and control the effects of numerical dispersion on the generated harmonics for several Maxwell solvers. Effects on angular deviation across a range of angles of incidence and strategies to mitigate dispersive effects via controlling interaction geometry are discussed.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"21 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124652384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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