Abstract
Expressions for describing Gaussian beams focused by a lens with
spherical aberration have been derived. Numerical results show
that, when the coefficient of the spherical aberration is negative, one
can obtain flattened laser irradiance at two positions along the
focused field. The larger the coefficient of negative spherical
aberration, the larger the flatness is. The effect of the Fresnel
number of the focusing lens on the flattened laser irradiance is also
investigated.
© 1998 Optical Society of America
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