Open AccessDynamic compensation of chromatic aberration in a programmable diffractive lens
Author(s) -
Marı́a S. Millán,
Joaquı́n Otón,
Elisabet PérezCabré
Publication year - 2006
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.14.009103
Subject(s) - optics , chromatic aberration , focal length , fresnel lens , lens (geology) , spatial light modulator , focus (optics) , cardinal point , chromatic scale , spatial filter , multiplexing , physics , wavelength , filter (signal processing) , spatial frequency , fresnel number , point spread function , diffraction , computer science , telecommunications , computer vision
A proposal to dynamically compensate chromatic aberration of a programmable phase Fresnel lens displayed on a liquid crystal device and working under broadband illumination is presented. It is based on time multiplexing a set of lenses, designed with a common focal length for different wavelengths, and a tunable spectral filter that makes each sublens work almost monochromatically. Both the tunable filter and the sublens displayed by the spatial light modulator are synchronized. The whole set of sublenses are displayed within the integration time of the sensor. As a result the central order focalization has a unique location at the focal plane and it is common for all selected wavelengths. Transversal chromatic aberration of the polychromatic point spread function is reduced by properly adjusting the pupil size of each sublens. Longitudinal chromatic aberration is compensated by making depth of focus curves coincident for the selected wavelengths. Experimental results are in very good agreement with theory.