1977•Journal of Physics D Applied PhysicsOpen access

Self-focusing and self-defocusing of laser beams in the extra-paraxial region: geometrical optics approximation

V. P. Nayyar, Narendra Verma

Abstract

The authors have studied the self-focusing/defocusing of transverse Gaussian (TEM 00 mode) and TEM 10 laser beams in a non-linear dielectric in the extraparaxial region. It has been found that at points near the axis, the lowest-order Gaussian mode exhibits self-focusing whereas for points away from the axis, self-defocusing occurs. The reverse effect has been found for the TEM 10 mode.

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Key concepts: Paraxial approximation, Self-focusing, Optics, Physics, Gaussian, Transverse mode, Transverse plane, Laser