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  1. Article ; Online: Fields of a Bessel-Bessel light bullet of arbitrary order in an under-dense plasma.

    Salamin, Yousef I

    Scientific reports

    2018  Volume 8, Issue 1, Page(s) 11362

    Abstract: Considerable theoretical and experimental work has lately been focused on waves localized in time and space. In optics, waves of that nature are often referred to as light bullets. The most fascinating feature of light bullets is their propagation ... ...

    Abstract Considerable theoretical and experimental work has lately been focused on waves localized in time and space. In optics, waves of that nature are often referred to as light bullets. The most fascinating feature of light bullets is their propagation without appreciable distortion by diffraction or dispersion. Here, analytic expressions for the fields of an ultra-short, tightly-focused and arbitrary-order Bessel pulse are derived and discussed. Propagation in an under-dense plasma, responding linearly to the fields of the pulse, is assumed throughout. The derivation stems from wave equations satisfied by the vector and scalar potentials, themselves following from the appropriate Maxwell equations and linked by the Lorentz gauge. It is demonstrated that the fields represent well a pulse of axial extension, L, and waist radius at focus, w
    Language English
    Publishing date 2018-07-27
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-018-29694-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Generation of Ultrabrilliant Polarized Attosecond Electron Bunches via Dual-Wake Injection.

    Sun, Ting / Zhao, Qian / Wan, Feng / Salamin, Yousef I / Li, Jian-Xing

    Physical review letters

    2024  Volume 132, Issue 4, Page(s) 45001

    Abstract: Laser wakefield acceleration is paving the way for the next generation of electron accelerators, for their own sake and as radiation sources. A controllable dual-wake injection scheme is put forward here to generate an ultrashort triplet electron bunch ... ...

    Abstract Laser wakefield acceleration is paving the way for the next generation of electron accelerators, for their own sake and as radiation sources. A controllable dual-wake injection scheme is put forward here to generate an ultrashort triplet electron bunch with high brightness and high polarization, employing a radially polarized laser as a driver. We find that the dual wakes can be driven by both transverse and longitudinal components of the laser field in the quasiblowout regime, sustaining the laser-modulated wakefield which facilitates the subcycle and transversely split injection of the triplet bunch. Polarization of the triplet bunch can be highly preserved due to the laser-assisted collective spin precession and the noncanceled transverse spins. In our three-dimensional particle-in-cell simulations, the triplet electron bunch, with duration about 500 as, six-dimensional brightness exceeding 10^{14}  A/m^{2}/0.1% and polarization over 80%, can be generated using a few-terawatt laser. Such an electron bunch could play an essential role in many applications, such as ultrafast imaging, nuclear structure and high-energy physics studies, and the operation of coherent radiation sources.
    Language English
    Publishing date 2024-02-09
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.132.045001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Fields of a Bessel-Bessel light bullet of arbitrary order in an under-dense plasma

    Yousef I. Salamin

    Scientific Reports, Vol 8, Iss 1, Pp 1-

    2018  Volume 8

    Abstract: Abstract Considerable theoretical and experimental work has lately been focused on waves localized in time and space. In optics, waves of that nature are often referred to as light bullets. The most fascinating feature of light bullets is their ... ...

    Abstract Abstract Considerable theoretical and experimental work has lately been focused on waves localized in time and space. In optics, waves of that nature are often referred to as light bullets. The most fascinating feature of light bullets is their propagation without appreciable distortion by diffraction or dispersion. Here, analytic expressions for the fields of an ultra-short, tightly-focused and arbitrary-order Bessel pulse are derived and discussed. Propagation in an under-dense plasma, responding linearly to the fields of the pulse, is assumed throughout. The derivation stems from wave equations satisfied by the vector and scalar potentials, themselves following from the appropriate Maxwell equations and linked by the Lorentz gauge. It is demonstrated that the fields represent well a pulse of axial extension, L, and waist radius at focus, w 0, both of the order of the central wavelength λ 0. As an example, to lowest approximation, the pulse of order l = 2 is shown to propagate undistorted for many centimeters, in vacuum as well as in the plasma. As such, the pulse behaves like a “light bullet” and is termed a “Bessel-Bessel bullet of arbitrary order”. The field expressions will help to better understand light bullets and open up avenues for their utility in potential applications.
    Keywords Medicine ; R ; Science ; Q
    Subject code 535
    Language English
    Publishing date 2018-07-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Electron acceleration by a radially-polarized laser pulse in a plasma micro-channel.

    Wen, Meng / Salamin, Yousef I / Keitel, Christoph H

    Optics express

    2019  Volume 27, Issue 2, Page(s) 557–566

    Abstract: Encouraged by recent advances in radially-polarized laser technology, simulations have been performed of electron acceleration by a tightly-focused, ultra-short pulse in a parabolic plasma micro-channel. Milli-joule laser pulses, generated at kHz ... ...

    Abstract Encouraged by recent advances in radially-polarized laser technology, simulations have been performed of electron acceleration by a tightly-focused, ultra-short pulse in a parabolic plasma micro-channel. Milli-joule laser pulses, generated at kHz repetition rates, are shown to produce electron bunches of MeV energy, pC charge, low emittance and low divergence. The pivotal role played by the channel length in controlling the process is demonstrated, and the roles of direct and wakefield acceleration are distinguished.
    Language English
    Publishing date 2019-01-29
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.27.000557
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Electron acceleration by a radially-polarized laser pulse in a plasma micro-channel: erratum.

    Wen, Meng / Salamin, Yousef I / Keitel, Christoph H

    Optics express

    2019  Volume 27, Issue 13, Page(s) 18958

    Abstract: Three of the headings of Table 1, which have been switched by mistake in our paper, are corrected here. The rest of the paper, including all results and conclusions, remain intact. ...

    Abstract Three of the headings of Table 1, which have been switched by mistake in our paper, are corrected here. The rest of the paper, including all results and conclusions, remain intact.
    Language English
    Publishing date 2019-06-27
    Publishing country United States
    Document type Journal Article ; Published Erratum
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.27.018958
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Fields of a focused linearly polarized Gaussian beam: truncated series versus the complex-source-point spherical-wave representation.

    Salamin, Yousef I

    Optics letters

    2008  Volume 34, Issue 5, Page(s) 683–685

    Abstract: Fields of a linearly polarized fundamental Gaussian beam are derived exactly using the propagation characteristics of a complex-source-point spherical wave diverging from the origin. Intensity distributions are calculated and compared with their ... ...

    Abstract Fields of a linearly polarized fundamental Gaussian beam are derived exactly using the propagation characteristics of a complex-source-point spherical wave diverging from the origin. Intensity distributions are calculated and compared with their counterparts in a truncated series. It is found that utility of the exact fields is limited by a discontinuity inherent in the vector potential from which they have been obtained.
    Language English
    Publishing date 2008-09-11
    Publishing country United States
    Document type Journal Article
    ISSN 0146-9592
    ISSN 0146-9592
    DOI 10.1364/ol.34.000683
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Acceleration in vacuum of bare nuclei by tightly focused radially polarized laser light.

    Salamin, Yousef I

    Optics letters

    2007  Volume 32, Issue 23, Page(s) 3462–3464

    Abstract: Fields of a radially polarized petawatt laser beam, represented by a truncated series in the diffraction angle epsilon to order epsilon15 and focused to subwavelength waist radius, are shown to accelerate protons and bare nuclei to several hundred MeV ... ...

    Abstract Fields of a radially polarized petawatt laser beam, represented by a truncated series in the diffraction angle epsilon to order epsilon15 and focused to subwavelength waist radius, are shown to accelerate protons and bare nuclei to several hundred MeV per nucleon over a distance equivalent to a few laser wavelengths.
    Language English
    Publishing date 2007-03-16
    Publishing country United States
    Document type Journal Article
    ISSN 0146-9592
    ISSN 0146-9592
    DOI 10.1364/ol.32.003462
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Mono-energetic GeV electrons from ionization in a radially polarized laser beam.

    Salamin, Yousef I

    Optics letters

    2006  Volume 32, Issue 1, Page(s) 90–92

    Abstract: Fields of a radially polarized laser beam developed recently [Y. I. Salamin, Opt. Lett.31, 2619 ...

    Abstract Fields of a radially polarized laser beam developed recently [Y. I. Salamin, Opt. Lett.31, 2619 (2006)] are employed to show that electrons produced by atomic ionization near the focus may be accelerated to GeV energies. Conditions for producing a mono-energetic and well-collimated electron beam are discussed.
    Language English
    Publishing date 2006-12-01
    Publishing country United States
    Document type Journal Article
    ISSN 0146-9592
    ISSN 0146-9592
    DOI 10.1364/ol.32.000090
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Fields of a radially polarized Gaussian laser beam beyond the paraxial approximation.

    Salamin, Yousef I

    Optics letters

    2006  Volume 31, Issue 17, Page(s) 2619–2621

    Abstract: Analytic expressions for the fields of a tightly focused radially polarized Gaussian laser beam are derived, accurate to epsilon5, where epsilon is the associated diffraction angle. The fields satisfy Maxwell's equations, and the calculated beam power ... ...

    Abstract Analytic expressions for the fields of a tightly focused radially polarized Gaussian laser beam are derived, accurate to epsilon5, where epsilon is the associated diffraction angle. The fields satisfy Maxwell's equations, and the calculated beam power based on them is significantly different from that of the paraxial-approximation fields.
    Language English
    Publishing date 2006-09-01
    Publishing country United States
    Document type Journal Article
    ISSN 0146-9592
    ISSN 0146-9592
    DOI 10.1364/ol.31.002619
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Feasibility of electron cyclotron autoresonance acceleration by a short terahertz pulse.

    Salamin, Yousef I / Li, Jian-Xing / Galow, Benjamin J / Keitel, Christoph H

    Optics express

    2015  Volume 23, Issue 13, Page(s) 17560–17567

    Abstract: A vacuum auto-resonance accelerator scheme for electrons, which employs terahertz radiation and currently available magnetic fields, is suggested. Based on numerical simulations, parameter values, which could make the scheme experimentally feasible, are ... ...

    Abstract A vacuum auto-resonance accelerator scheme for electrons, which employs terahertz radiation and currently available magnetic fields, is suggested. Based on numerical simulations, parameter values, which could make the scheme experimentally feasible, are identified and discussed.
    Language English
    Publishing date 2015-06-29
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.23.017560
    Database MEDical Literature Analysis and Retrieval System OnLINE

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