Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 77: Photonics – 3D Printing
Q 77.3: Vortrag
Freitag, 6. März 2026, 15:00–15:15, P 2
Interferometric wavefront characterization of 3D printed microlens singlets and doublets — •Yanqiu Zhao1, Chris-Peter Winkler1, Leander Siegle1, Simon Thiele2, and Harald Giessen1 — 14th Physics Institute, Stuttgart, Germany — 2Printoptix GmbH, Stuttgart, Germany
Femtosecond 3D printing allows for accurate fabrication of microoptics from diameters around 50 micrometers to millimeter scales. Characterizing the shape of printed singlet and doublet lenses is essential to quantify surface deviations caused by polymer shrinkage.
Confocal surface profiling allows z-deviation measurements down to 2 nanometers but loses accuracy on strongly curved surfacesand cannot reliably capture all surfaces or post lengths in compound lenses.
Therefore, we implement a lateral shear interferometer to actually measure the wavefront passing through the 3D printed microlenses, capturing both surface errors as well as refractive index variations from polymer density changes.
Combining confocal profiling with iterative wavefront interferometry, we demonstrate Strehl ratios above 0.97 with RMS wavefront errors around lambda/35 for singlets of over 600 micrometers diameter. For 3D printed doublets, we achieve Strehl ratios above 0.95 with RMS wavefront errors around lambda/28. Residual spherical aberrations are below lambda/100; residual coma and astigmatism values range around lambda/45.
This approach proves that 3D printed microlenses can compete with the best classically manufactured glass lenses up to a certain diameter.
Keywords: wavefront characterization; interferometric; micro optics; lateral shear interferometer; femtosecond 3D printing