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23. Use of 3D printing in astronomical mirror fabrication

Author

Herkommer, Alois M., von Freymann, Georg, Flury, Manuel, Roulet, Mélanie, Atkins, Carolyn, Hugot, Emmanuel, Snell, Robert, van de Vorst, Bart, Morris, Katherine, Marcos, Michel, Todd, Iain, Miller, Christopher, Dufils, Joris, Farkas, Szigfrid, Mezo, Gyorgy, Tenegi, Fabio, Vega-Moreno, Afrodisio, and Schnelter, Hermine

Published
2020
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29. Mass-producible micro-optical elements by injection compression molding and focused ion beam structured titanium molding tools

Author

Ristok, Simon, Roeder, Marcel, Thiele, Simon, Hentschel, Mario, Guenther, Thomas, Zimmermann, André, Herkommer, Alois M., and Giessen, Harald

Abstract

We demonstrate mass production compatible fabrication of polymer-based micro Fresnel lenses by injection compression molding. The extremely robust titanium-molding tool is structured with high precision by focused ion beam milling. In order to achieve optimal shape accuracy in the titanium we use an iterative design optimization. The inverse Fresnel lens structured into the titanium is transferred to polymers by injection compression molding, enabling rapid mass replication. We show that the optical performance of the molded diffractive Fresnel lenses is in good agreement with simulations, rendering our approach suitable for applications that require compact and high-quality optical elements in large numbers.

Published
2020

36. 3D opto-structuring of ceramics at nanoscale

Author

Herkommer, Alois M., von Freymann, Georg, Flury, Manuel, Padolskytė, Viktorija, Gailevičius, Darius, Jonušauskas, Linas, Mikoliūnaitė, Lina, Katkus, Tomas, Gadonas, Roaldas, Šakirzanovas, Simas, Mizeikis, Vygantas, Staliunas, Kestutis, Juodkazis, Saulius, and Malinauskas, Mangirdas

Published
2018
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45. Alternate optical designs for head-mounted displays with a wide field of view

Author

Chen, Bo and Herkommer, Alois M.

Abstract

The most widely applied design form for mixed reality head-mounted display (HMD) systems is generally a prism with one surface in total internal reflection (TIR). This, however, limits the angle of the incident rays, and thus decreases the design freedom and affects the performance. To obtain better performance of the HMD optics, in this paper two seldom used design forms of HMD systems are presented and compared to the standard TIR HMD optics. One of them is a catadioptric HMD system, consisting of one lens and two mirrors; the other is a prism HMD with a different folding geometry. The designs are compared for a field of view of 40°×30°; however, they are also investigated for an increased field of view of 50°×30°. The evaluation indicates good performance of our systems. In particular, the prism with an alternate folding geometry has advantages in both performance and size.

Published
2017

46. Ultra-compact on-chip LED collimation optics by 3D femtosecond direct laser writing

Author

Thiele, Simon, Gissibl, Timo, Giessen, Harald, and Herkommer, Alois M.

Abstract

By using two-photon lithographic 3D printing, we demonstrate additive manufacturing of a dielectric concentrator directly on a LED chip. With a size of below 200 μm in diameter and length, light output is increased by a factor of 6.2 in collimation direction, while the emission half-angle is reduced by 50%. We measure excellent form fidelity and irradiance patterns close to simulation. Additionally, a more complex shape design is presented, which exhibits a nonconventional triangular illumination pattern. The introduced method features exceptional design freedoms which can be used to tailor high-quality miniature illumination optics for specific lighting tasks, for example, endoscopy.

Published
2016

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