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Researchers from the University of Stuttgart used a 3D-printing process called two-photon lithography to make highly precise lenses that are just a few micrometers in size and that reduce chromatic aberrations. The miniature lenses could be used in small cameras and endoscopes to correct color distortion during imaging.
Two-photon lithography uses a focused laser beam to polymerize a liquid light-sensitive material known as photoresist. Two-photon absorption allows the photoresist to be polymerized in cubic micrometer volumes, which enables fabrication of complex optical structures on the micrometer scale. The Stuttgart team has been investigating micro-optics made with two-photon lithography for the past 10 years.