We study the interaction of two counter–propagating electromagnetic waves in vacuum in the Born–Infeld electrodynamics. First we investigate the Born case for linearly polarized beams, E · B = 0, i. e. G2 = 0 (crossed field configuration), which is identical for Born–Infeld and Born electrodynamics; subsequently we study the general Born–Infeld case for beams which are nonlinearly polarized, G2 ≠ 0. In both cases, we show that the nonlinear field equations decouple using self-similar solutions and investigate the shock wave formation. We show that the only nonlinear solutions are exceptional travelling wave solutions which propagate with constant speed and which do not turn into shocks. In the Born case, we naturally obtain exceptional wave solutions for counter–propagating (real photon– photon scattering) and for a co–propagating (non-interacting) beam orientation we investigate their direction of propagation. In the Born–Infeld case, we have additionally chosen the solutions which have constant phase velocities to match the limits of phase velocities of the background field in the Born case. We obtain two types of exceptional wave solutions, then we numerically analyze which phase velocities correspond to the counter– or co–propagating beams and subsequently we determine the direction of propagation of the exceptional waves.
{"title":"Photon-photon scattering in Born-Infeld electrodynamics","authors":"H. Kadlecová","doi":"10.1117/12.2665647","DOIUrl":"https://doi.org/10.1117/12.2665647","url":null,"abstract":"We study the interaction of two counter–propagating electromagnetic waves in vacuum in the Born–Infeld electrodynamics. First we investigate the Born case for linearly polarized beams, E · B = 0, i. e. G2 = 0 (crossed field configuration), which is identical for Born–Infeld and Born electrodynamics; subsequently we study the general Born–Infeld case for beams which are nonlinearly polarized, G2 ≠ 0. In both cases, we show that the nonlinear field equations decouple using self-similar solutions and investigate the shock wave formation. We show that the only nonlinear solutions are exceptional travelling wave solutions which propagate with constant speed and which do not turn into shocks. In the Born case, we naturally obtain exceptional wave solutions for counter–propagating (real photon– photon scattering) and for a co–propagating (non-interacting) beam orientation we investigate their direction of propagation. In the Born–Infeld case, we have additionally chosen the solutions which have constant phase velocities to match the limits of phase velocities of the background field in the Born case. We obtain two types of exceptional wave solutions, then we numerically analyze which phase velocities correspond to the counter– or co–propagating beams and subsequently we determine the direction of propagation of the exceptional waves.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"248 1-2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120892867","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}
J. Krempaský, J. Vonka, B. Pedrini, A. Steppke, U. Flechsig, R. Follath, B. Rösner, U. Wagner, C. David, M. Makita, P. Vagovič
Steering x-ray beams from the source towards the experiment without distorting their wavefront defines extraordinary high-quality requirements on the production of the x-ray optics. We report on how this demand settled with in situ shot-to-shot wavefront sensing optimization of KB optics at SwissFEL beamlines. This contribution presents methodology that combines moir´e interferometry and single-phase-grating Talbot interferometry. We discuss an online Kirkpatrick-Baez (KB) test plan at the Cristallina beamline based on single phase grating Talbot interferometry, demonstrating progressive optimization steps in minimizing KB wavefront distortion.
{"title":"SwissFEL KB-optics at-wavelength wavefront characterisation","authors":"J. Krempaský, J. Vonka, B. Pedrini, A. Steppke, U. Flechsig, R. Follath, B. Rösner, U. Wagner, C. David, M. Makita, P. Vagovič","doi":"10.1117/12.2665587","DOIUrl":"https://doi.org/10.1117/12.2665587","url":null,"abstract":"Steering x-ray beams from the source towards the experiment without distorting their wavefront defines extraordinary high-quality requirements on the production of the x-ray optics. We report on how this demand settled with in situ shot-to-shot wavefront sensing optimization of KB optics at SwissFEL beamlines. This contribution presents methodology that combines moir´e interferometry and single-phase-grating Talbot interferometry. We discuss an online Kirkpatrick-Baez (KB) test plan at the Cristallina beamline based on single phase grating Talbot interferometry, demonstrating progressive optimization steps in minimizing KB wavefront distortion.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130831703","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}
Kryštof Kadlec, J. Šulc, H. Jelínková, K. Nejezchleb, L. Beran, R. Kudělka
The aim of this work was to design a compact Q-switched laser generating radiation in the 1.3 μm spectral region. Two active materials, Nd:YAG and Nd:YAP, were used to construct such a compact laser with stable nanosecond pulses which could be used as a laser source of LIDAR for autonomous vehicle control. A constructed laser was pumped longitudinally by a fiber-coupled laser diode (core diameter 400 μm, numerical aperture 0.22) in a pulse regime at a wavelength of around 805nm in the range of repetition frequencies of 10 − 500 Hz. A V:YAG saturable absorber with an initial transmission of 85% was used to achieve the Q-switched regime. The pumping resonator dielectric mirror had a high transmission for pumping radiation and high reflectivity for generated 1.3 μm radiation. The output resonator dielectric mirror reflectivity was 90% @ 1.3 μm. The Nd:YAG/V:YAG laser provided radiation at a wavelength of 1318nm with pulse energy up to 162 μJ, pulse length ∼ 13.5 ns, and pulse peak power up to 12.3 kW. With the Nd:YAP/V:YAG compact laser generating at a wavelength of 1342 nm, a pulse energy of up to 193 μJ, pulse length ∼ 11.8 ns, and pulse peak power up to 16.2 kW, was achieved. Generated pulse energy and peak power decay with increasing pumping frequency was steeper in the case of Nd:YAP/V:YAG laser due to poorer thermal conductivity of Nd:YAP crystal compared to Nd:YAG crystal. On the other hand, the Nd:YAP/V:YAG laser showed better stability of the wavelength and polarization of the output radiation. In the case of both lasers, linearly polarized radiation with TEM00 single-mode spatial profile was generated.
{"title":"Comparison of compact lasers Nd:YAG/V:YAG and Nd:YAP/V:YAG generating in the 1.3μm spectral region","authors":"Kryštof Kadlec, J. Šulc, H. Jelínková, K. Nejezchleb, L. Beran, R. Kudělka","doi":"10.1117/12.2665109","DOIUrl":"https://doi.org/10.1117/12.2665109","url":null,"abstract":"The aim of this work was to design a compact Q-switched laser generating radiation in the 1.3 μm spectral region. Two active materials, Nd:YAG and Nd:YAP, were used to construct such a compact laser with stable nanosecond pulses which could be used as a laser source of LIDAR for autonomous vehicle control. A constructed laser was pumped longitudinally by a fiber-coupled laser diode (core diameter 400 μm, numerical aperture 0.22) in a pulse regime at a wavelength of around 805nm in the range of repetition frequencies of 10 − 500 Hz. A V:YAG saturable absorber with an initial transmission of 85% was used to achieve the Q-switched regime. The pumping resonator dielectric mirror had a high transmission for pumping radiation and high reflectivity for generated 1.3 μm radiation. The output resonator dielectric mirror reflectivity was 90% @ 1.3 μm. The Nd:YAG/V:YAG laser provided radiation at a wavelength of 1318nm with pulse energy up to 162 μJ, pulse length ∼ 13.5 ns, and pulse peak power up to 12.3 kW. With the Nd:YAP/V:YAG compact laser generating at a wavelength of 1342 nm, a pulse energy of up to 193 μJ, pulse length ∼ 11.8 ns, and pulse peak power up to 16.2 kW, was achieved. Generated pulse energy and peak power decay with increasing pumping frequency was steeper in the case of Nd:YAP/V:YAG laser due to poorer thermal conductivity of Nd:YAP crystal compared to Nd:YAG crystal. On the other hand, the Nd:YAP/V:YAG laser showed better stability of the wavelength and polarization of the output radiation. In the case of both lasers, linearly polarized radiation with TEM00 single-mode spatial profile was generated.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115470643","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}
Imitating the self-regulated motions of natural species allows for novel applications in inanimate material systems. These applications include autonomous robotic systems, adaptive devices, and auto-energy harvesting. However, significant challenges exist in accurately controlling stimulus-induced deformations and establishing a reliable relationship between external energy fields and material deformations. In this study, we demonstrate that a simple light-triggered bending actuation in smart material systems based on liquid crystal elastomers is influenced by an opto-mechano-optical feedback mechanism. The pre-curved geometry enables enhance of light absorption upon photothermally induced deformation (from bent to flat), followed by a reduce of energy absorption upon further deformation (from flattening to bending toward the light). This strong nonlinearity in stimulus-induced deformability is governed by positive and negative feedback, and we experimentally verified these mechanisms using a thermal camera. Our results reveal the ubiquitous feedback nature of most light-active polymer systems.
{"title":"Feedbacks in light-active soft materials","authors":"Jianfeng Yang, Haotian Pi, Hang Zhang, H. Zeng","doi":"10.1117/12.2665325","DOIUrl":"https://doi.org/10.1117/12.2665325","url":null,"abstract":"Imitating the self-regulated motions of natural species allows for novel applications in inanimate material systems. These applications include autonomous robotic systems, adaptive devices, and auto-energy harvesting. However, significant challenges exist in accurately controlling stimulus-induced deformations and establishing a reliable relationship between external energy fields and material deformations. In this study, we demonstrate that a simple light-triggered bending actuation in smart material systems based on liquid crystal elastomers is influenced by an opto-mechano-optical feedback mechanism. The pre-curved geometry enables enhance of light absorption upon photothermally induced deformation (from bent to flat), followed by a reduce of energy absorption upon further deformation (from flattening to bending toward the light). This strong nonlinearity in stimulus-induced deformability is governed by positive and negative feedback, and we experimentally verified these mechanisms using a thermal camera. Our results reveal the ubiquitous feedback nature of most light-active polymer systems.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121018230","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}
L. Indra, A. Špaček, J. Green, J. Bartoníček, J. Novák, B. Tykalewicz, Jan Eisenschreiber, M. Horáček, J. Naylon, B. Rus
The L2-DUHA Laser (Dual-beam Ultra-fast High energy OPCPA Amplifier) designed to provide 100 TW-level pulses at 50 Hz is being developed at ELI-beamlines. The front end will provide the seed for 100 TW pulse train and also synchronized multi-mJ, sub 50 fs, 2.2 μm auxiliary output at 2 kHz, both generated via supercontinuum. The near-IR branch centered around 820 nm is amplified in two OPCPA stages and stretched to 1.5 ns. The beam in the mid-IR branch is combined with a 1030 nm beam in DFG to generate a mid-IR beam centered around 2.2 μm, amplified in three OCPA stages and compressed.
{"title":"Development of L2-DUHA laser front-end for near-IR and mid-IR generation at ELI-Beamlines","authors":"L. Indra, A. Špaček, J. Green, J. Bartoníček, J. Novák, B. Tykalewicz, Jan Eisenschreiber, M. Horáček, J. Naylon, B. Rus","doi":"10.1117/12.2668909","DOIUrl":"https://doi.org/10.1117/12.2668909","url":null,"abstract":"The L2-DUHA Laser (Dual-beam Ultra-fast High energy OPCPA Amplifier) designed to provide 100 TW-level pulses at 50 Hz is being developed at ELI-beamlines. The front end will provide the seed for 100 TW pulse train and also synchronized multi-mJ, sub 50 fs, 2.2 μm auxiliary output at 2 kHz, both generated via supercontinuum. The near-IR branch centered around 820 nm is amplified in two OPCPA stages and stretched to 1.5 ns. The beam in the mid-IR branch is combined with a 1030 nm beam in DFG to generate a mid-IR beam centered around 2.2 μm, amplified in three OCPA stages and compressed.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127125796","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}
K. Tasca, A. Madsen, I. Petrov, A. Rodriguez-Fernandez, R. Shayduk, M. Vannoni, A. Zozulya, L. Samoylova
The European X-Ray Free Electron Laser (EuXFEL) is a unique facility that provides femtosecond x-ray pulses of high pulse energy at MHz repetition rate. However, the high peak power results in a high dynamical heat load in the optical components, like monochromators, which reduces the intensity of the transmitted pulses significantly as compared to the full capacity of the EuXFEL source. To address these challenges at the high photon energy instruments of EuXFEL, we propose a diamond channel cut monochromator as an alternative to the standard Si monochromators. Diamond has a lower absorption cross-section at high photon energies and a higher thermal conductivity compared to Si, making diamond a promising candidate for x-ray optics applications under high heat load conditions. Here, we present a finite element model (FEM) of the temperature increase in diamond and the resulting thermal expansion to estimate the changes in the diffraction profile and the expected monochromator transmission depending on the number of pulses.
{"title":"Performance simulation of a diamond channel cut monochromator operating under high-heat load at the European X-Ray Free-Electron Laser Facility","authors":"K. Tasca, A. Madsen, I. Petrov, A. Rodriguez-Fernandez, R. Shayduk, M. Vannoni, A. Zozulya, L. Samoylova","doi":"10.1117/12.2669178","DOIUrl":"https://doi.org/10.1117/12.2669178","url":null,"abstract":"The European X-Ray Free Electron Laser (EuXFEL) is a unique facility that provides femtosecond x-ray pulses of high pulse energy at MHz repetition rate. However, the high peak power results in a high dynamical heat load in the optical components, like monochromators, which reduces the intensity of the transmitted pulses significantly as compared to the full capacity of the EuXFEL source. To address these challenges at the high photon energy instruments of EuXFEL, we propose a diamond channel cut monochromator as an alternative to the standard Si monochromators. Diamond has a lower absorption cross-section at high photon energies and a higher thermal conductivity compared to Si, making diamond a promising candidate for x-ray optics applications under high heat load conditions. Here, we present a finite element model (FEM) of the temperature increase in diamond and the resulting thermal expansion to estimate the changes in the diffraction profile and the expected monochromator transmission depending on the number of pulses.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115031739","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}
S. Sanad, AbdelRahman M. Ghanim, Nasr Gad, Mostafa Elaasser, A. Yahia, M. Swillam
Organic solar cells (OSCs) are characterized by their low cost, flexibility, compact size, and solution processing. OSCs are created utilizing a nontoxic technology that employs bulkhetrojunction (BHJ) structures. The photo conversion efficiency (PCE) of OSCs has been boasted in the last decades. BHJ fullerene-based OSCs have low open-circuit voltages and poor photo absorption. In this study, the recent non-fullerene acceptor (Y6), which has an electron-deficient core-based central fused ring, has been used. The promising PM6:Y6 material is used as an active layer in the proposed OSCs. The light trapping of the OSCs is enhanced by embedding plasmonic nanoparticles (NPs) in one of its layers. This could be a long-term approach to collecting more light in the photoactive layer. Au and Ag NPs have been employed the most in plasmonic OSCs. They improve PCE due to their plasmonic properties, strong localized surface plasmonic resonance (LSPR) in the visible region of the light spectrum, on-toxicity, and oxidation resistance, although Ag NPs are prone to oxidation. However, they have high costs and thermal instability. Alternative plasmonic materials such as refractory metals with high melting temperatures exceeding 2000°C and high thermal and chemical stability are employed in this work holding a comparative study between them.
{"title":"Enhanced light harvesting in PM6:Y6 organic solar cells using plasmonic nanostructures","authors":"S. Sanad, AbdelRahman M. Ghanim, Nasr Gad, Mostafa Elaasser, A. Yahia, M. Swillam","doi":"10.1117/12.2670419","DOIUrl":"https://doi.org/10.1117/12.2670419","url":null,"abstract":"Organic solar cells (OSCs) are characterized by their low cost, flexibility, compact size, and solution processing. OSCs are created utilizing a nontoxic technology that employs bulkhetrojunction (BHJ) structures. The photo conversion efficiency (PCE) of OSCs has been boasted in the last decades. BHJ fullerene-based OSCs have low open-circuit voltages and poor photo absorption. In this study, the recent non-fullerene acceptor (Y6), which has an electron-deficient core-based central fused ring, has been used. The promising PM6:Y6 material is used as an active layer in the proposed OSCs. The light trapping of the OSCs is enhanced by embedding plasmonic nanoparticles (NPs) in one of its layers. This could be a long-term approach to collecting more light in the photoactive layer. Au and Ag NPs have been employed the most in plasmonic OSCs. They improve PCE due to their plasmonic properties, strong localized surface plasmonic resonance (LSPR) in the visible region of the light spectrum, on-toxicity, and oxidation resistance, although Ag NPs are prone to oxidation. However, they have high costs and thermal instability. Alternative plasmonic materials such as refractory metals with high melting temperatures exceeding 2000°C and high thermal and chemical stability are employed in this work holding a comparative study between them.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121378216","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}
We discuss the use of the thin film compression (TFC) technique for generating an ultrafast X-ray beam having a few femtoseconds in duration which could be appropriate for pump and probe experiment. Our results demonstrate the potential of the technique for the generation of a few fs hard X-ray beam through the LWFA-based betatron process, enabling an extraordinary short X-ray probe for doing time resolved X-ray absorption spectroscopy of ultra-relativistic plasmas.
{"title":"Use of the Thin Film Compression (TFC) technique to generate laser-wakefield-based few femtoseconds X-ray probe for ultrafast time-resolved measurements of plasmas","authors":"J. Kieffer, S. Fourmaux","doi":"10.1117/12.2669501","DOIUrl":"https://doi.org/10.1117/12.2669501","url":null,"abstract":"We discuss the use of the thin film compression (TFC) technique for generating an ultrafast X-ray beam having a few femtoseconds in duration which could be appropriate for pump and probe experiment. Our results demonstrate the potential of the technique for the generation of a few fs hard X-ray beam through the LWFA-based betatron process, enabling an extraordinary short X-ray probe for doing time resolved X-ray absorption spectroscopy of ultra-relativistic plasmas.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130741145","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}
Plasma accelerators can generate electron beams with a smaller physical footprint and properties un-achievable with conventional modulation methods. The Laser Plasma Accelerator (LPA) platform at the SASE (self-amplified spontaneous emission) line of Shanghai Soft X-ray Free-Electron Laser Facility (SXFEL) has been being constructed since 2020. The synchronization of the LPA platform and the electron beam from SXFEL has been achieved in 2022. The acceleration, and the energy modulation of the electron beam of the LPA platform is observed by an energy spectrometer. The designing and the commissioning of the LPA platform is ongoing. Simulation of the LPA system can be performed by the code Quick PIC, and the accelerated or modulated electron beam can be used to generate XFEL with different properties, such as ultrafast XFEL, large bandwidth XFEL and so on. In this paper, we will present the possibility of generating ultrafast XFEL by the electron beam modulated by the LPA platform. Preliminary start-to-end simulation result shows that we can achieve ultrashort XFEL pulses with the pulse duration of 4.8 fs by simple method, and the pulse duration can be further reduced by changing the setup of the LPA.
{"title":"Simulation of generating ultrafast pulses using an LPA at SXFEL","authors":"L. Tu, Weijie Fan, C. Feng, Zhentang（赵振堂） Zhao","doi":"10.1117/12.2665924","DOIUrl":"https://doi.org/10.1117/12.2665924","url":null,"abstract":"Plasma accelerators can generate electron beams with a smaller physical footprint and properties un-achievable with conventional modulation methods. The Laser Plasma Accelerator (LPA) platform at the SASE (self-amplified spontaneous emission) line of Shanghai Soft X-ray Free-Electron Laser Facility (SXFEL) has been being constructed since 2020. The synchronization of the LPA platform and the electron beam from SXFEL has been achieved in 2022. The acceleration, and the energy modulation of the electron beam of the LPA platform is observed by an energy spectrometer. The designing and the commissioning of the LPA platform is ongoing. Simulation of the LPA system can be performed by the code Quick PIC, and the accelerated or modulated electron beam can be used to generate XFEL with different properties, such as ultrafast XFEL, large bandwidth XFEL and so on. In this paper, we will present the possibility of generating ultrafast XFEL by the electron beam modulated by the LPA platform. Preliminary start-to-end simulation result shows that we can achieve ultrashort XFEL pulses with the pulse duration of 4.8 fs by simple method, and the pulse duration can be further reduced by changing the setup of the LPA.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133715961","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. Seidel, Anne-lise Viotti, S. Alisauskas, A. Tajalli, O. Akcaalan, J. Darvill, N. Ekanayake, U. Grosse-Wortmann, C. Li, C. Mohr, F. Pressacco, N. Schirmel, A. Swiderski, H. Tavakol, H. Tünnermann, C. Vidoli, L. Winkelmann, C. Heyl, B. Manschwetus, H. Cankaya, I. Hartl
The majority of user experiments at the high repetition-rate free electron laser (FEL) facility FLASH are of pump-probe type, combining the extreme ultraviolet (XUV) or soft x-ray radiation from the FEL with ultrashort pulses generated by optical lasers. In this contribution, we demonstrate the advantages of using high-power Yb:YAG lasers with subsequent nonlinear pulse compression stages based on multi-pass cells (MPC). The approach enables the combination of hundreds of kHz to MHz repetition-rates, hundreds of watts of average powers and excellent intensity stabilities. We present the characteristics of the MPC-based pump-probe laser at the FLASH plane-grating beamlines. Furthermore, we report pulse compression to 8.2 fs pulse duration and the seeding of an optical parametric amplifier generating mid-IR radiation tunable from 1.4 µm to 16 µm.
{"title":"Multi-pass cell-based nonlinear pulse compression of Yb:YAG pump-probe lasers at FLASH","authors":"M. Seidel, Anne-lise Viotti, S. Alisauskas, A. Tajalli, O. Akcaalan, J. Darvill, N. Ekanayake, U. Grosse-Wortmann, C. Li, C. Mohr, F. Pressacco, N. Schirmel, A. Swiderski, H. Tavakol, H. Tünnermann, C. Vidoli, L. Winkelmann, C. Heyl, B. Manschwetus, H. Cankaya, I. Hartl","doi":"10.1117/12.2665321","DOIUrl":"https://doi.org/10.1117/12.2665321","url":null,"abstract":"The majority of user experiments at the high repetition-rate free electron laser (FEL) facility FLASH are of pump-probe type, combining the extreme ultraviolet (XUV) or soft x-ray radiation from the FEL with ultrashort pulses generated by optical lasers. In this contribution, we demonstrate the advantages of using high-power Yb:YAG lasers with subsequent nonlinear pulse compression stages based on multi-pass cells (MPC). The approach enables the combination of hundreds of kHz to MHz repetition-rates, hundreds of watts of average powers and excellent intensity stabilities. We present the characteristics of the MPC-based pump-probe laser at the FLASH plane-grating beamlines. Furthermore, we report pulse compression to 8.2 fs pulse duration and the seeding of an optical parametric amplifier generating mid-IR radiation tunable from 1.4 µm to 16 µm.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"718 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122000167","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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