München 2019 – wissenschaftliches Programm

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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 6: Laser Applications I

K 6.3: Vortrag

Mittwoch, 20. März 2019, 11:40–12:00, HS 3

Millimeter-sized 3D printed high-quality complex optical elements — •Simon Ristok1, Simon Thiele2, Andrea Toulouse2, Alois Herkommer2, and Harald Gießen11University of Stuttgart, 4th Physisc Institute — 2University of Stuttgart, Institute of Applied Optics

Complex three dimensional structures on the micrometer scale can be fabricated by focusing a femtosecond laser at 780 nm into a UV sensitive photoresist. The photoresist is polymerized via two-photon absorption at 390 nm in a small volume element around the laser focus, resulting in sub-micrometer resolution. By moving the focus through the photoresist arbitrary complex optical elements can be produced [1,2].

Particularly the high resolution renders this direct laser writing technique suitable for the fabrication of high quality optical elements on the micrometer scale. However, if larger structures are required, challenges like prolonged fabrication time, increasing absorption inside the photoresist, and increased surface roughness arise. In this work we focus on how to overcome these challenges in order to increase the size of our structures to over 2 mm without stitching, narrowing the size gap between conventionally manufactured and 3D printed optical elements.

[1] T. Gissibl et al., Two-photon direct laser writing of ultracompact multi-lens objectives, Nature Photonics 10, 554 (2016).

[2] T. Gissibl et al., Sub-micrometer accurate free-form optics by three-dimensional printing on single-mode fibres, Nature Communications 7, 11763 (2016).

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