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Axial Intensities of Focused Truncated Elliptical Gaussian Beams

Axial intensities have been calculated for an elliptical Gaussian beam, like that produced by a semiconductor laser. The beam is focused by a thin lens, which fills a circular aperture of any prescribed radius. It was found that there are two intensity maxima along the axis in the system of the Fresnel number N≫1. These two maxima merge into one as the Fresnel number decreases, and as a consequence, the intensity fluctuation along the axis is reduced. Further evolution is concerned with the oscillations and rapid transition of the point of the absolute maximum intensity in the course that leads to an approach of this point toward the focusing lens.