Publications by authors named "Ralf Hellmann"

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Optimization of Mechanical Properties and Evaluation of Fatigue Behavior of Selective Laser Sintered Polyamide-12 Components.
David Sommer, Henry Stockfleet, Ralf Hellmann

Polymers (Basel)· May 2024

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Birefringence in Injection-Molded Cyclic Olefin Copolymer Substrates and Its Impact on Integrated Photonic Structures.
Stefan Kefer, Tobias Limbach, Natalie Pape, Kathrin Klamt, Bernhard Schmauss, Ralf Hellmann

Polymers (Basel)· January 2024

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Preparation of Dispersed Copper(II) Oxide Nanosuspensions as Precursor for Femtosecond Reductive Laser Sintering by High-Energy Ball Milling.
Kay Bischoff, Cemal Esen, Ralf Hellmann

Nanomaterials (Basel)· October 2023

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Fundamental Considerations and Analysis of the Energy Distribution in Laser Turning with Ultrashort Laser Pulses.
Julian Zettl, Cemal Esen, Ralf Hellmann

Micromachines (Basel)· September 2023

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Drilling Sequence Optimization Using Evolutionary Algorithms to Reduce Heat Accumulation for Femtosecond Laser Drilling with Multi-Spot Beam Profiles.
Christian Lutz, Jonas Helm, Katrin Tschirpke, Cemal Esen, Ralf Hellmann

Materials (Basel)· August 2023

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Static and Dynamic Mechanical Behaviour of Hybrid-PBF-LB/M-Built and Hot Isostatic Pressed Lattice Structures.
David Sommer, Cemal Esen, Ralf Hellmann

Materials (Basel)· May 2023

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Integration of Bragg gratings in aerosol-jetted polymer optical waveguides for strain monitoring capabilities.
Kay Bischoff, Stefan Kefer, Alexander Wienke, Ludger Overmeyer, Stefan Kaierle, Ralf Hellmann

Opt Lett· April 2023

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Evaluation of SLS 3D-Printed Filter Structures Based on Bionic Manta Structures.
Benedikt Adelmann, Tobias Schwiddessen, Babette Götzendorfer, Ralf Hellmann

Materials (Basel)· November 2022

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Femtosecond Laser-Based Micromachining of Rotational-Symmetric Sapphire Workpieces.
Stefan Kefer, Julian Zettl, Cemal Esen, Ralf Hellmann

Materials (Basel)· September 2022

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Function Integration in Additive Manufacturing: Design and Realization of an LPBF Built Compressed Air Motor.
Benedikt Adelmann, Ralf Hellmann

Materials (Basel)· September 2022

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Micromachining of Alumina Using a High-Power Ultrashort-Pulsed Laser.
Stefan Rung, Niklas Häcker, Ralf Hellmann

Materials (Basel)· August 2022

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Optimization of Heat Accumulation during Femtosecond Laser Drilling Borehole Matrices by Using a Simplex Algorithm.
Christian Lutz, Marcel Jung, Katrin Tschirpke, Cemal Esen, Ralf Hellmann

Materials (Basel)· July 2022

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UV-Femtosecond-Laser Structuring of Cyclic Olefin Copolymer.
Kay Bischoff, Dominik Mücke, Gian-Luca Roth, Cemal Esen, Ralf Hellmann

Polymers (Basel)· July 2022

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Ultrashort Pulsed Laser Drilling of Printed Circuit Board Materials.
Daniel Franz, Tom Häfner, Tim Kunz, Gian-Luca Roth, Stefan Rung, Ralf Hellmann

Materials (Basel)· May 2022

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Space-variant polarization conversion with artificial birefringent metallic elements.
Stefan Belle, Stefan F Helfert, Stefan Kefer, Ralf Hellmann, Jürgen Jahns

Opt Lett· April 2022

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Image Processing Algorithm for In Situ Monitoring Fiber Laser Remote Cutting by a High-Speed Camera.
Max Schleier, Benedikt Adelmann, Cemal Esen, Ralf Hellmann

Sensors (Basel)· April 2022

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Influence of Periodic Non-Uniformities of Well-Structured Sapphire Surface by LIPSS on the Alignment of Nematic Liquid Crystal.
Igor Gvozdovskyy, Zoya Kazantseva, Simon Schwarz, Ralf Hellmann

Nanomaterials (Basel)· February 2022

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Tool Wear and Milling Characteristics for Hybrid Additive Manufacturing Combining Laser Powder Bed Fusion and In Situ High-Speed Milling.
David Sommer, Dominik Pape, Cemal Esen, Ralf Hellmann

Materials (Basel)· February 2022

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Design Rules for Hybrid Additive Manufacturing Combining Selective Laser Melting and Micromilling.
David Sommer, Babette Götzendorfer, Cemal Esen, Ralf Hellmann

Materials (Basel)· October 2021

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Tunable, Anisotropic Permeability and Spatial Flow of SLM Manufactured Structures.
Babette Goetzendorfer, Hannah Kirchgaessner, Ralf Hellmann

Materials (Basel)· September 2021

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Simultaneous Burr and Cut Interruption Detection during Laser Cutting with Neural Networks.
Benedikt Adelmann, Ralf Hellmann

Sensors (Basel)· August 2021

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Ultrashort pulsed laser backside ablation of fused silica.
Simon Schwarz, Stefan Rung, Cemal Esen, Ralf Hellmann

Opt Express· July 2021

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Deep UV Formation of Long-Term Stable Optical Bragg Gratings in Epoxy Waveguides and Their Biomedical Sensing Potentials.
Steffen Hessler, Marieke Rüth, Horst-Dieter Lemke, Bernhard Schmauss, Ralf Hellmann

Sensors (Basel)· June 2021

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Enhanced ablation efficiency using GHz bursts in micromachining fused silica.
Simon Schwarz, Stefan Rung, Cemal Esen, Ralf Hellmann

Opt Lett· January 2021

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Laser Cut Interruption Detection from Small Images by Using Convolutional Neural Network.
Benedikt Adelmann, Max Schleier, Ralf Hellmann

Sensors (Basel)· January 2021

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