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The influence that Seidel spherical aberration has on the irradiance distribution along the optical axis, or the Strehl ratio versus defocus, is expressed in terms of a differential operator. This permits us to describe separately the following two effects: a focal shift and a shape variation. We analyze two annular apodizers that reduce the shape variation of the Strehl ratio versus defocus.
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Ojeda‐Castañeda et al. (1988) studied this question.
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