Amplification of beams with orbital angular momentum to ultra-high intensity by Brillouin scattering

ORAL

Abstract

To date high-order harmonics in the extreme ultra-violet with orbital angular momentum (OAM) have been observed in laser-atom interactions, operating at a moderate intensity. Recently, the use of a plasma as the optical medium has been shown to be strong candidate as a potential route towards the production of OAM light with relativistic intensities and ultra-high peak and average power laser pulses. Plasmas also allow for greater flexibility in the level of OAM in the output laser beam than other more conventional techniques.

Here, one-dimensional (1D) particle-in-cell simulations and Vlasov simulations are given to find the optimal parameter region for the Brillouin amplification, in which the seed pulse can be amplified to ultra-high intensity. Next a self-similar model of Brillouin amplification taking into account waving-breaking, filamentation and parasitic Brillouin/Raman scatterings will be presented in order to obtain the optimal seed duration and plasma length. Then full-scale three-dimensional (3D) particle-in-cell simulations are given to amplify the intense OAM beams to ultra-high intensity by stimulated Brillouin scattering in short-scale plasmas. Finally, we provide evidence that new OAM modes are also generated in the Brillouin amplification process.

*This research was supported by the Oxford-ShanghaiTech collaboration project, the National Natural Science Foundation of China (Grant Nos. 12005021).

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Presenters

  • Qingsong Feng

    • University of Oxford
    • Department of Physics, Atomic and Laser Physics sub-Department, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom

Authors

  • Qingsong Feng

    • University of Oxford
    • Department of Physics, Atomic and Laser Physics sub-Department, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom

  • Ramy Aboushelbaya

    • University of Oxford
    • Department of Physics, Atomic and Laser Physics sub-Department, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom

  • Marko W Mayr

    • University of Oxford

  • Ben T Spiers

    • University of Oxford
    • Department of Physics, Atomic and Laser Physics sub-Department, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom

  • Robert W Paddock

    • University of Oxford
    • Department of Physics, Atomic and Laser Physics sub-Department, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom

  • Iustin Ouatu

    • University of Oxford
    • Department of Physics, Atomic and Laser Physics sub-Department, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom

  • Robin Timmis

    • University of Oxford
    • Department of Physics, Atomic and Laser Physics sub-Department, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom

  • Robin Wang

    • University of Oxford

  • Peter A Norreys

    • Rutherford Appleton Lab
    • Department of Physics, Atomic and Laser Physics sub-Department, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom; Central Laser Facility