Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 32: Photonics and Biophotonics II
Q 32.1: Vortrag
Mittwoch, 4. März 2026, 14:30–14:45, P 3
Alternative phase-reconstruction algorithms for 3D spot-based beam shapes — •Tim-Dominik Gómez1, Daniel Flamm2, and Harald Giessen1 — 14th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany — 2Trumpf GmbH & Co KG, Ditzingen, Germany
Beams with spatially varying, non-Gaussian profiles are essential across diverse research fields, particularly in applications like imaging and material processing. These can be shaped with the help of diffractive or holographic optical elements, such as spatial light modulators or metasurfaces, which in many cases results in the restriction to phase-only manipulating optical elements. The resulting calculation of an appropriate phase mask for a specific 3D beam-shape often use iterative Fourier transform algorithms (IFTA). For free-space propagation the number of 2D Fast Fourier transforms (FFT) involved scale with the number observed layers and is thus computationally intensive. This is the case even if the desired beam shape consists only of a number of high intensity spots in space, as is often required for material processing applications.
In this work, we present alternative algorithms for the generation of phase masks for such 3D, spot-based beam shapes for Fresnel diffraction with Gaussian spots, as well as when using the first Rayleigh-Sommerfeld solution. These do not require the use of 2D Fast Fourier Transforms and promise faster calculation speeds in cases of spots that are highly distributed in the z-direction.
Keywords: CGH; Wave propagation; 3D Beam-shaping; Holography; Material processing