30 September 2013 Helical apodizers for tunable hyper Gaussian masks
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Abstract
We discuss an optical method for controlling the half-width of Gaussian like transmittance windows, by using a pair of absorption masks that have both radial and helical amplitude variations. For describing the radial part of the proposed masks, we employ amplitude transmittance profiles of the form T(ρ) = exp(- ρ s ). For s = 2, one has an amplitude transmittance that is proportional to a Gaussian function. A sub Gaussian mask is defined by a value of s < 2. And if s > 2, one has super Gaussian masks. Our discussion considers that any of these radially varying masks has also helical modulations. We show that by using a suitable pair of this type of masks, one can control the halfwidth of Gaussian like windows.
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J. Ojeda-Castañeda, Sergio Ledesma, Cristina M. Gómez-Sarabia, "Helical apodizers for tunable hyper Gaussian masks", Proc. SPIE 8842, Novel Optical Systems Design and Optimization XVI, 88420N (30 September 2013); doi: 10.1117/12.2022497; https://doi.org/10.1117/12.2022497
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