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Self-focusing of Laguerre–Gaussian laser beams in collisionless plasma: paraxial-like approach

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Abstract

The unique characteristic of Laguerre–Gaussian beams (LGBs) is their orbital angular momentum originated from twisting the phase of light into helical shape and forming a spiral. The self-focusing of LGBs in plasma in different physical situations on a certain domains of laser–plasma parameters has a clear physical interpretation, can be easily analysed and could be controlled in an experiment for diverse applications. Present work is therefore devoted to the self-focusing properties of LGBs in collisionless plasma. Considering the ponderomotive nonlinearity, a nonlinear Schrodinger-type equation for the beam width parameter is established analytically with the help of Wentzel–Kramers–Brillouin approximation and paraxial-like approach. The effects of laser parameters and plasma parameters on the self-focusing properties of the LGBs have been explored. The investigation reveals the fact that as vortex charge number of LGBs and plasma electron temperature increases, the extent of self-focusing decreases. Further, with increase in intensity parameter of LGBs and plasma electron density, the self-focusing of LGBs increases.

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Acknowledgements

One of the authors S.S. Patil is thankful to Government of Maharashtra for financial support through National Research Fellowship Program (SARTHI).

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Authors and Affiliations

  1. Department of Physics, Devchand College, Arjunnagar, Kolhapur, Maharashtra, 591237, India

    S. S. Patil, M. B. Mane, P. P. Nikam, P. P. Shinde, P. P. Patil & S. D. Patil

  2. Department of Physics, Shivaji University, Kolhapur, Maharashtra, 416004, India

    K. Y. Khandale, P. T. Takale & M. V. Takale

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  1. S. S. Patil
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  3. P. T. Takale
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Patil, S.S., Khandale, K.Y., Takale, P.T. et al. Self-focusing of Laguerre–Gaussian laser beams in collisionless plasma: paraxial-like approach. J Opt (2023). https://doi.org/10.1007/s12596-023-01478-2

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