TY  - CONF
AU  - Škorić, Miloš M.
AU  - Nikolić, Ljubomir
AU  - Hadžievski, Ljupčo
AU  - Batani, Dimitri
AU  - Ishiguro, Seiji
AU  - Mima, Kunioki
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7102
AB  - A stimulated Raman scattering (SRS) is a great concern for laser fusion, causing an energy and symmetry loss and target preheating. In particular, for dominating backward SRS (BRS), a complexity of nonlinear saturation was revealed. Recently, to develop lasers at multi-exawatts and beyond, relevant to high-energy physics, a proposed Raman amplification based on BRS met a restrictive operation window. Here, we stress BRS generics that due to a nonlinear frequency shift (relativistic/trapping effect), it nonlinearly saturates with intermittent pulsations. A break up of Manley-Rowe invariants explains a non-steady saturation. Further, a coherent pulsation BRS regime is proposed for femto-sec pulse generation in a thin exploding foil plasma, with parameter scalings investigated by analytics and particle simulations.
C3  - Journal of Physics: Conference Series
T1  - Control and ultra-short pulse generation in stimulated Raman backscattering
VL  - 688
DO  - 10.1088/1742-6596/688/1/012112
ER  - 

@conference{
author = "Škorić, Miloš M. and Nikolić, Ljubomir and Hadžievski, Ljupčo and Batani, Dimitri and Ishiguro, Seiji and Mima, Kunioki",
year = "2016",
abstract = "A stimulated Raman scattering (SRS) is a great concern for laser fusion, causing an energy and symmetry loss and target preheating. In particular, for dominating backward SRS (BRS), a complexity of nonlinear saturation was revealed. Recently, to develop lasers at multi-exawatts and beyond, relevant to high-energy physics, a proposed Raman amplification based on BRS met a restrictive operation window. Here, we stress BRS generics that due to a nonlinear frequency shift (relativistic/trapping effect), it nonlinearly saturates with intermittent pulsations. A break up of Manley-Rowe invariants explains a non-steady saturation. Further, a coherent pulsation BRS regime is proposed for femto-sec pulse generation in a thin exploding foil plasma, with parameter scalings investigated by analytics and particle simulations.",
journal = "Journal of Physics: Conference Series",
title = "Control and ultra-short pulse generation in stimulated Raman backscattering",
volume = "688",
doi = "10.1088/1742-6596/688/1/012112"
}

Škorić, M. M., Nikolić, L., Hadžievski, L., Batani, D., Ishiguro, S.,& Mima, K.. (2016). Control and ultra-short pulse generation in stimulated Raman backscattering. in Journal of Physics: Conference Series, 688.
https://doi.org/10.1088/1742-6596/688/1/012112

Škorić MM, Nikolić L, Hadžievski L, Batani D, Ishiguro S, Mima K. Control and ultra-short pulse generation in stimulated Raman backscattering. in Journal of Physics: Conference Series. 2016;688.
doi:10.1088/1742-6596/688/1/012112 .

Škorić, Miloš M., Nikolić, Ljubomir, Hadžievski, Ljupčo, Batani, Dimitri, Ishiguro, Seiji, Mima, Kunioki, "Control and ultra-short pulse generation in stimulated Raman backscattering" in Journal of Physics: Conference Series, 688 (2016),
https://doi.org/10.1088/1742-6596/688/1/012112 . .

TY  - JOUR
AU  - Škorić, Miloš M.
AU  - Nikolić, Lj.
AU  - Hadžievski, Ljupčo
AU  - Ishiguro, Seiji
AU  - Mima, Kunioki
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6955
AB  - Optical pulse compression by the linear reflection of a laser pulse from a relativistically moving plasma is studied. Using Lorentz transformations, covariance of Maxwells equations and the principle of phase invariance to transform between the rest frame and the moving frame, analytics can be exactly performed in the moving frame. Closed-form formulae for reflected waveforms as a function of incident angle show temporal compression and intensity amplification by a factor of 2 gamma and 4 gamma(2), respectively, where gamma is the Lorentz factor of the relativistic electron plasma. As an independent test, fully relativistic electromagnetic particle simulations agree well with analytical results, predicting pulse compression and large amplification to be of relevance to the generation of attosecond optical pulses.
T2  - Physica Scripta
T1  - Ultra-short photon pulse generation in relativistic laser-plasmas
VL  - T149
DO  - 10.1088/0031-8949/2012/T149/014081
ER  - 

@article{
author = "Škorić, Miloš M. and Nikolić, Lj. and Hadžievski, Ljupčo and Ishiguro, Seiji and Mima, Kunioki",
year = "2012",
abstract = "Optical pulse compression by the linear reflection of a laser pulse from a relativistically moving plasma is studied. Using Lorentz transformations, covariance of Maxwells equations and the principle of phase invariance to transform between the rest frame and the moving frame, analytics can be exactly performed in the moving frame. Closed-form formulae for reflected waveforms as a function of incident angle show temporal compression and intensity amplification by a factor of 2 gamma and 4 gamma(2), respectively, where gamma is the Lorentz factor of the relativistic electron plasma. As an independent test, fully relativistic electromagnetic particle simulations agree well with analytical results, predicting pulse compression and large amplification to be of relevance to the generation of attosecond optical pulses.",
journal = "Physica Scripta",
title = "Ultra-short photon pulse generation in relativistic laser-plasmas",
volume = "T149",
doi = "10.1088/0031-8949/2012/T149/014081"
}

Škorić, M. M., Nikolić, Lj., Hadžievski, L., Ishiguro, S.,& Mima, K.. (2012). Ultra-short photon pulse generation in relativistic laser-plasmas. in Physica Scripta, T149.
https://doi.org/10.1088/0031-8949/2012/T149/014081

Škorić MM, Nikolić L, Hadžievski L, Ishiguro S, Mima K. Ultra-short photon pulse generation in relativistic laser-plasmas. in Physica Scripta. 2012;T149.
doi:10.1088/0031-8949/2012/T149/014081 .

Škorić, Miloš M., Nikolić, Lj., Hadžievski, Ljupčo, Ishiguro, Seiji, Mima, Kunioki, "Ultra-short photon pulse generation in relativistic laser-plasmas" in Physica Scripta, T149 (2012),
https://doi.org/10.1088/0031-8949/2012/T149/014081 . .

TY  - CONF
AU  - Nikolić, Lj.
AU  - Škorić, Miloš M.
AU  - Ishiguro, Seiji
AU  - Sakagami, H.
AU  - Vidal, F.
AU  - Johnston, T.
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6897
AB  - Hollow cone-shaped overdense plasma targets were used to investigate the generation and transport of fast particles in a high-intensity laser-matter interaction. Using 2d PIC simulations we examine cone, cone-wire and cone with an open tip target designs. Localization of electron jets and an angular spread are found in all cases of the laser-cone interaction. However, in the cone-wire geometry, at later times, the charge separation and radial electric fields around the wire collimate electron streams with an electron hot spot at the front end of the wire. The main mechanism of the electron transport in the targets is the reflection of electrons from the potential walls of the cone surface, and no significant surface electron transport is observed. Furthermore, the presence of harmonics in the reflected light suggests that the field intensity in the cone can be enhanced not only by simple multiple reflection but also by the field modulation due to harmonics generation. Moreover, it is found that the laser interaction with the open-tip cone can efficiently generate trains of short ( LT lambda) attosecond electron sheets close to the laser axis.
C3  - Journal of Physics: Conference Series
T1  - Particle Simulations of High-Intensity Laser Interaction with Cone Targets
VL  - 112
DO  - 10.1088/1742-6596/112/2/022086
ER  - 

@conference{
author = "Nikolić, Lj. and Škorić, Miloš M. and Ishiguro, Seiji and Sakagami, H. and Vidal, F. and Johnston, T.",
year = "2008",
abstract = "Hollow cone-shaped overdense plasma targets were used to investigate the generation and transport of fast particles in a high-intensity laser-matter interaction. Using 2d PIC simulations we examine cone, cone-wire and cone with an open tip target designs. Localization of electron jets and an angular spread are found in all cases of the laser-cone interaction. However, in the cone-wire geometry, at later times, the charge separation and radial electric fields around the wire collimate electron streams with an electron hot spot at the front end of the wire. The main mechanism of the electron transport in the targets is the reflection of electrons from the potential walls of the cone surface, and no significant surface electron transport is observed. Furthermore, the presence of harmonics in the reflected light suggests that the field intensity in the cone can be enhanced not only by simple multiple reflection but also by the field modulation due to harmonics generation. Moreover, it is found that the laser interaction with the open-tip cone can efficiently generate trains of short ( LT lambda) attosecond electron sheets close to the laser axis.",
journal = "Journal of Physics: Conference Series",
title = "Particle Simulations of High-Intensity Laser Interaction with Cone Targets",
volume = "112",
doi = "10.1088/1742-6596/112/2/022086"
}

Nikolić, Lj., Škorić, M. M., Ishiguro, S., Sakagami, H., Vidal, F.,& Johnston, T.. (2008). Particle Simulations of High-Intensity Laser Interaction with Cone Targets. in Journal of Physics: Conference Series, 112.
https://doi.org/10.1088/1742-6596/112/2/022086

Nikolić L, Škorić MM, Ishiguro S, Sakagami H, Vidal F, Johnston T. Particle Simulations of High-Intensity Laser Interaction with Cone Targets. in Journal of Physics: Conference Series. 2008;112.
doi:10.1088/1742-6596/112/2/022086 .

Nikolić, Lj., Škorić, Miloš M., Ishiguro, Seiji, Sakagami, H., Vidal, F., Johnston, T., "Particle Simulations of High-Intensity Laser Interaction with Cone Targets" in Journal of Physics: Conference Series, 112 (2008),
https://doi.org/10.1088/1742-6596/112/2/022086 . .

TY  - CONF
AU  - Nikolić, Lj.
AU  - Ishiguro, Seiji
AU  - Škorić, Miloš M.
PY  - 2004
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6493
AB  - To investigate the growth of instabilities in an underdense plasma, a number of simulations was carried out using the one-dimensional electromagnetic (EM) relativistic particle-in-cell code. A new type of Raman-like scattering was identified in a subcritical regime, which is over-dense for standard SRS. This novel instability is a parametric decay of the relativistic EM wave into a scattered light and an electron-acoustic (omega LT omega(p)) electrostatic wave. In the linear stage, resonant matchings are well satisfied, while the scattered Stokes wave is always driven near critical. During nonlinear saturation, due to rapid growth and strong localization of the Stokes wave, narrow intense EM soliton-like structures with down-shifted laser light trapped inside are formed; eventually, to be irradiated through the plasma-vacuum interface in the form of intense low-frequency EM bursts. This behavior alters the distribution of laser energy between transmission, scattering losses and generation of energetic electrons.
C3  - AIP Conference Proceedings
T1  - Simulations of relativistic laser-plasma interactions
VL  - 740
SP  - 509
EP  - 520
UR  - https://hdl.handle.net/21.15107/rcub_vinar_6493
ER  - 

@conference{
author = "Nikolić, Lj. and Ishiguro, Seiji and Škorić, Miloš M.",
year = "2004",
abstract = "To investigate the growth of instabilities in an underdense plasma, a number of simulations was carried out using the one-dimensional electromagnetic (EM) relativistic particle-in-cell code. A new type of Raman-like scattering was identified in a subcritical regime, which is over-dense for standard SRS. This novel instability is a parametric decay of the relativistic EM wave into a scattered light and an electron-acoustic (omega LT omega(p)) electrostatic wave. In the linear stage, resonant matchings are well satisfied, while the scattered Stokes wave is always driven near critical. During nonlinear saturation, due to rapid growth and strong localization of the Stokes wave, narrow intense EM soliton-like structures with down-shifted laser light trapped inside are formed; eventually, to be irradiated through the plasma-vacuum interface in the form of intense low-frequency EM bursts. This behavior alters the distribution of laser energy between transmission, scattering losses and generation of energetic electrons.",
journal = "AIP Conference Proceedings",
title = "Simulations of relativistic laser-plasma interactions",
volume = "740",
pages = "509-520",
url = "https://hdl.handle.net/21.15107/rcub_vinar_6493"
}

Nikolić, Lj., Ishiguro, S.,& Škorić, M. M.. (2004). Simulations of relativistic laser-plasma interactions. in AIP Conference Proceedings, 740, 509-520.
https://hdl.handle.net/21.15107/rcub_vinar_6493

Nikolić L, Ishiguro S, Škorić MM. Simulations of relativistic laser-plasma interactions. in AIP Conference Proceedings. 2004;740:509-520.
https://hdl.handle.net/21.15107/rcub_vinar_6493 .

Nikolić, Lj., Ishiguro, Seiji, Škorić, Miloš M., "Simulations of relativistic laser-plasma interactions" in AIP Conference Proceedings, 740 (2004):509-520,
https://hdl.handle.net/21.15107/rcub_vinar_6493 .

TY  - JOUR
AU  - Baiwen, L
AU  - Ishiguro, Seiji
AU  - Škorić, Miloš M.
AU  - Takamaru, H
AU  - Sato, T
PY  - 2004
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6484
AB  - The mechanism of electron acceleration by intense laser pulse interacting with an underdense plasma layer is examined by one-dimensional particle-m-cell (1D-PIC) simulations. The standard dephasing limit and the electron acceleration process are discussed briefly. A new phenomenon, of short high-quality, well-collimated return relativistic electron beam with thermal energy spread, is observed in the direction opposite to laser propagation. The process of the electron beam formation, its characteristics, and the time-history in x and p, space for test electrons in the beam, are analyzed and exposed clearly. Finally, an estimate for the maximum electron energy appears in a good agreement with simulation results.
T2  - Laser and Particle Beams
T1  - Acceleration of high-quality, well-collimated return beam of relativistic electrons by intense laser pulse in a low-density plasma
VL  - 22
IS  - 3
SP  - 307
EP  - 314
DO  - 10.1017/S0263034604223151
ER  - 

@article{
author = "Baiwen, L and Ishiguro, Seiji and Škorić, Miloš M. and Takamaru, H and Sato, T",
year = "2004",
abstract = "The mechanism of electron acceleration by intense laser pulse interacting with an underdense plasma layer is examined by one-dimensional particle-m-cell (1D-PIC) simulations. The standard dephasing limit and the electron acceleration process are discussed briefly. A new phenomenon, of short high-quality, well-collimated return relativistic electron beam with thermal energy spread, is observed in the direction opposite to laser propagation. The process of the electron beam formation, its characteristics, and the time-history in x and p, space for test electrons in the beam, are analyzed and exposed clearly. Finally, an estimate for the maximum electron energy appears in a good agreement with simulation results.",
journal = "Laser and Particle Beams",
title = "Acceleration of high-quality, well-collimated return beam of relativistic electrons by intense laser pulse in a low-density plasma",
volume = "22",
number = "3",
pages = "307-314",
doi = "10.1017/S0263034604223151"
}

Baiwen, L., Ishiguro, S., Škorić, M. M., Takamaru, H.,& Sato, T.. (2004). Acceleration of high-quality, well-collimated return beam of relativistic electrons by intense laser pulse in a low-density plasma. in Laser and Particle Beams, 22(3), 307-314.
https://doi.org/10.1017/S0263034604223151

Baiwen L, Ishiguro S, Škorić MM, Takamaru H, Sato T. Acceleration of high-quality, well-collimated return beam of relativistic electrons by intense laser pulse in a low-density plasma. in Laser and Particle Beams. 2004;22(3):307-314.
doi:10.1017/S0263034604223151 .

Baiwen, L, Ishiguro, Seiji, Škorić, Miloš M., Takamaru, H, Sato, T, "Acceleration of high-quality, well-collimated return beam of relativistic electrons by intense laser pulse in a low-density plasma" in Laser and Particle Beams, 22, no. 3 (2004):307-314,
https://doi.org/10.1017/S0263034604223151 . .

TY  - JOUR
AU  - Nikolić, Ljubomir
AU  - Škorić, Miloš M.
AU  - Ishiguro, Seiji
AU  - Sato, Tetsuya
PY  - 2003
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6361
AB  - Propagation of a laser light through regions of an underdense plasma is an active research topic in laser fusion. In particular, a large effort has been invested in studies of stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS), which can reflect laser energy and produce energetic particles to preheat a fusion energy target. Experiments, theory, and simulations agree on a complex interplay between various laser-plasma instabilities. By particle-in-cell simulations of an underdense electron plasma, apart from the standard SRS, a strong backscattering was found near the electron plasma frequency at densities beyond the quarter critical. This novel instability, recognized in recent experiments as stimulated laser scattering on a trapped electron-acoustic mode (SEAS), is absent from a classical theory of laser-parametric instabilities. A parametric excitation of SEAS instability is explained by a three-wave resonant decay of the incident laser light into a standing backscattered wave and a slow trapped electron-acoustic wave (omega LT omega(p)). Large SEAS pulsations, eventually suppressed by relativistic heating of electrons, are observed in these simulations. This phenomenon seems relevant to future hohlraum target and fast ignition experiments.
T2  - Fusion Science and Technology
T1  - On stimulated scattering of laser light in inertial fusion energy targets
VL  - 43
IS  - 3
SP  - 359
EP  - 365
DO  - 10.13182/FST03-A279
ER  - 

@article{
author = "Nikolić, Ljubomir and Škorić, Miloš M. and Ishiguro, Seiji and Sato, Tetsuya",
year = "2003",
abstract = "Propagation of a laser light through regions of an underdense plasma is an active research topic in laser fusion. In particular, a large effort has been invested in studies of stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS), which can reflect laser energy and produce energetic particles to preheat a fusion energy target. Experiments, theory, and simulations agree on a complex interplay between various laser-plasma instabilities. By particle-in-cell simulations of an underdense electron plasma, apart from the standard SRS, a strong backscattering was found near the electron plasma frequency at densities beyond the quarter critical. This novel instability, recognized in recent experiments as stimulated laser scattering on a trapped electron-acoustic mode (SEAS), is absent from a classical theory of laser-parametric instabilities. A parametric excitation of SEAS instability is explained by a three-wave resonant decay of the incident laser light into a standing backscattered wave and a slow trapped electron-acoustic wave (omega LT omega(p)). Large SEAS pulsations, eventually suppressed by relativistic heating of electrons, are observed in these simulations. This phenomenon seems relevant to future hohlraum target and fast ignition experiments.",
journal = "Fusion Science and Technology",
title = "On stimulated scattering of laser light in inertial fusion energy targets",
volume = "43",
number = "3",
pages = "359-365",
doi = "10.13182/FST03-A279"
}

Nikolić, L., Škorić, M. M., Ishiguro, S.,& Sato, T.. (2003). On stimulated scattering of laser light in inertial fusion energy targets. in Fusion Science and Technology, 43(3), 359-365.
https://doi.org/10.13182/FST03-A279

Nikolić L, Škorić MM, Ishiguro S, Sato T. On stimulated scattering of laser light in inertial fusion energy targets. in Fusion Science and Technology. 2003;43(3):359-365.
doi:10.13182/FST03-A279 .

Nikolić, Ljubomir, Škorić, Miloš M., Ishiguro, Seiji, Sato, Tetsuya, "On stimulated scattering of laser light in inertial fusion energy targets" in Fusion Science and Technology, 43, no. 3 (2003):359-365,
https://doi.org/10.13182/FST03-A279 . .

TY  - JOUR
AU  - Nikolić, Lj.
AU  - Škorić, Miloš M.
AU  - Ishiguro, Seiji
AU  - Sato, T
PY  - 2002
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2555
AB  - Intense laser-plasma interaction can be a source of various electronic instabilities. Recently, stimulated backscattering from a trapped electron-acoustic wave (SEAS) [Montgomery , Phys. Rev. Lett. 87, 155001 (2001)] was proposed to reinterpret spectra previously attributed to stimulated Raman scattering (SRS) from unrealistically low densities. By particle simulations in a uniform plasma layer, which is overdense for ordinary SRS, strong reflection by SEAS at the electron plasma frequency is found. Transient SEAS reflectivity pulsations are followed by strong relativistic heating of electrons. Physical conditions are explained by three-wave parametric coupling between laser light, standing backscattered wave and slow electron-acoustic wave. Regions in which SEAS reflection can dominate over SRS are singled out.
T2  - Physical Review E
T1  - Stimulated electron-acoustic-wave scattering in a laser plasma
VL  - 66
IS  - 3
DO  - 10.1103/PhysRevE.66.036404
ER  - 

@article{
author = "Nikolić, Lj. and Škorić, Miloš M. and Ishiguro, Seiji and Sato, T",
year = "2002",
abstract = "Intense laser-plasma interaction can be a source of various electronic instabilities. Recently, stimulated backscattering from a trapped electron-acoustic wave (SEAS) [Montgomery , Phys. Rev. Lett. 87, 155001 (2001)] was proposed to reinterpret spectra previously attributed to stimulated Raman scattering (SRS) from unrealistically low densities. By particle simulations in a uniform plasma layer, which is overdense for ordinary SRS, strong reflection by SEAS at the electron plasma frequency is found. Transient SEAS reflectivity pulsations are followed by strong relativistic heating of electrons. Physical conditions are explained by three-wave parametric coupling between laser light, standing backscattered wave and slow electron-acoustic wave. Regions in which SEAS reflection can dominate over SRS are singled out.",
journal = "Physical Review E",
title = "Stimulated electron-acoustic-wave scattering in a laser plasma",
volume = "66",
number = "3",
doi = "10.1103/PhysRevE.66.036404"
}

Nikolić, Lj., Škorić, M. M., Ishiguro, S.,& Sato, T.. (2002). Stimulated electron-acoustic-wave scattering in a laser plasma. in Physical Review E, 66(3).
https://doi.org/10.1103/PhysRevE.66.036404

Nikolić L, Škorić MM, Ishiguro S, Sato T. Stimulated electron-acoustic-wave scattering in a laser plasma. in Physical Review E. 2002;66(3).
doi:10.1103/PhysRevE.66.036404 .

Nikolić, Lj., Škorić, Miloš M., Ishiguro, Seiji, Sato, T, "Stimulated electron-acoustic-wave scattering in a laser plasma" in Physical Review E, 66, no. 3 (2002),
https://doi.org/10.1103/PhysRevE.66.036404 . .