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Holographic tuning of physical axicons

  • Axicon generated Bessel beams are a popular tool for high aspect ratio precision laser drilling. Spot diameter and working distance are given by the geometric parameters of the axicon and the wavelength used. Thus, it is difficult to manipulate the beam shape of a Bessel beam for a given setup. Spatial light modulators (SLMs) overcome limitations in flexibility. However, due to the limited phase shift of SLMs, only Bessel beams with flat cone angles and large focal length can be generated. In this contribution, an approach for generating Bessel beams with a shorter, but tunable focal length is presented. A physical axicon was combined with an SLM. A holographic image of a negative axicon is put on the SLM to generate a ring beam, which is focused by a subsequent physical axicon to get a small focal diameter. Thus, different sized high aspect ratio micro holes can be drilled without using any moving components.

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Metadaten
Author:Jan Marx, Cemal Esen, Christian Lutz, Ralf HellmannORCiD, Andreas Ostendorf
Publisher:LiM 2023 Proceedings
Document Type:Conference Proceeding
Language:English
Year of Completion:2023
Date of first Publication:2023/09/18
Release Date:2024/03/11
Tag:Beam shaping
Axicon; Bessel beam; Micro drilling; Spatial light modulator
GND Keyword:Bessel-Bündel; Axicon; Strahlformung, Laser
Volume:2023
Issue:154
Page Number:9
First Page:1
Last Page:9
Urheberrecht:1
Institutes:Fakultät Ingenieurwissenschaften / Labore / Angewandte Lasertechnik und Photonik (alp)
research focus :Materials / Innovative Material Processing
Reviewed:nein
Licence (German):Keine Lizenz - es gilt das deutsche Urheberrecht
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