6533b7dbfe1ef96bd1271557

RESEARCH PRODUCT

Analytical formula for calculating the focal shift in apodized systems

Manuel Martínez-corralCarlos J. Zapata-rodríguezMarek KowalczykPedro Andrés

subject

Physicsbusiness.industryAstrophysics::Instrumentation and Methods for AstrophysicsMagnitude (mathematics)Standard deviationAtomic and Molecular Physics and OpticsAzimuthOpticsApodizationProduct (mathematics)TransmittanceFresnel numberRotational invariancebusiness

description

We report a quite simple analytical formula for the evaluation of the focal shift in apodized systems, with or without rotational invariance. Specifically it is shown that the magnitude of the focal shift is determined by the product of the Fresnel number of the focusing geometry and the standard deviation of a mapped version of the azimuthal average of the pupil transmittance. To illustrate our approach, several examples are examined.

https://doi.org/10.1080/095003498150943