Modern two-photon-polymerization 3D printing technology allows for the creation of almost arbitrary threedimensional structures for the production of complex freeform optical surfaces. While being highly controllable and accurate to below 100 nm some systematic deviation by volumetric changes during the polymerization and development process remains. This can however be corrected for when the surface deviation is known. We present a method to include repeatable measurements and the consequent shape correction during the production process of monolithically created complex freeform lens systems. Measurement concepts as well as consequences to shape improvements are shown. An example for the application of such corrections for the creation of low profile multi-aperture large field of view objectives is presented.
We present the evaluation and comparison of four different polymers (VeroClear, ClearVue, LOCTITE 3820, and WaterShed) to produce macro transparent optical components using additive manufacturing. The refractive indices were measured at increasing temperatures. The Cauchy and Sellmeier coefficients were fitted subsequently. We used the measured and calculated parameters to determine the Abbe numbers of materials at increasing temperatures. Several different lenses of the mentioned polymers with varying orientations were printed and evaluated according to transmission, imaging quality, and temperature-dependent behavior. The results were used to build an illumination demonstrator to simulate the sunlight as it is created by a roof window.
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