Induced focusing and conversion of a Gaussian beam into an elliptic Gaussian beam |
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Authors: | Manoj Mishra Swapan Konar |
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Institution: | (1) Department of Applied Physics, Birla Institute of Technology, Mesra, 835 215 Ranchi, India |
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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. |
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Keywords: | Self-focusing induced focusing Kerr nonlinearity nonlinear wave propagation Gaussian laser beam |
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