• Induced focusing and conversion of a Gaussian beam into an elliptic Gaussian beam

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      https://www.ias.ac.in/article/fulltext/pram/065/03/0425-0436

    • Keywords

       

      Self-focusing; induced focusing; Kerr nonlinearity; nonlinear wave propagation; Gaussian laser beam

    • Abstract

       

      We have presented an investigation of the induced focusing in Kerr media of two laser beams, the pump beam and the probe beam, which could be either Gaussian or elliptic Gaussian or a combination of the two. We have used variational formalism to derive relevant beam-width equations. Among several important findings, the finding that a very week probe beam can be guided and focused when power of both beams are well below their individual threshold for self-focusing, is a noteworthy one. It has been found that induced focusing is not possible for laser beams of any wavelength and beam radius. In case both beams are elliptic Gaussian, we have shown that when power of both beams is above a certain threshold value then the effective radius of both beams collapses and collapse distance depends on power. Moreover, it has been found that induced focusing can be employed to convert a circular Gaussian beam into an elliptic Gaussian beam.

    • Author Affiliations

       

      Manoj Mishra1 Swapan Konar1

      1. Department of Applied Physics, Birla Institute of Technology, Mesra, Ranchi - 835 215, India
    • Dates

       
  • Pramana – Journal of Physics | News

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