@article{RungBokanKleinwortetal.2019, author = {Rung, Stefan and Bokan, Kevin and Kleinwort, Frederick and Schwarz, Simon and Simon, Peter and Klein-Wiele, Jan-Hendrik and Esen, Cemal and Hellmann, Ralf}, title = {Possibilities of Dry and Lubricated Friction Modification Enabled by Different Ultrashort Laser-Based Surface Structuring Methods}, series = {Lubricants}, volume = {7}, journal = {Lubricants}, number = {43}, doi = {10.3390/lubricants7050043}, pages = {1 -- 13}, year = {2019}, abstract = {In this contribution we report on the possibilities of dry and lubricated friction modification introduced by different laser surface texturing methods. We compare the potential of Laser-Induced Periodic Surface Structures and Laser Beam Interference Ablation on 100Cr6 steel in a linear reciprocating ball-on-disc configuration using 100Cr6 steel and tungsten carbide balls with load forces between 50mN and 1000 mN. For dry friction, we find a possibility to reduce the coefficient of friction and we observe a pronounced direction dependency for surfaces fabricated by Laser Beam Interference Ablation. Furthermore, Laser-Induced Periodic Surface Structures result in a load-dependent friction reduction for lubricated linear reciprocating movements. This work helps to identify the modification behaviour of laser generated micro structures with feature sizes of approximately 1μm and reveals new possibilities for surface engineering}, subject = {Laser}, language = {en} } @inproceedings{SchwarzRungEsenetal.2020, author = {Schwarz, Simon and Rung, Stefan and Esen, Cemal and Hellmann, Ralf}, title = {Current results on laser-based production of complex optics in glass}, series = {10. Wetzlarer Herbsttagung "Moderne Optikfertigung", 29. - 30. September 2020, Wetzlar}, booktitle = {10. Wetzlarer Herbsttagung "Moderne Optikfertigung", 29. - 30. September 2020, Wetzlar}, year = {2020}, subject = {Laserbearbeitung}, language = {en} } @inproceedings{SchwarzRungEsenetal.2020, author = {Schwarz, Simon and Rung, Stefan and Esen, Cemal and Hellmann, Ralf}, title = {UKP-Prozess mit anschließendem CO2-Laserpolieren zur Fertigung komplexer Optiken}, series = {10. Workshop Laserbearbeitung von Glaswerkstoffen}, booktitle = {10. Workshop Laserbearbeitung von Glaswerkstoffen}, year = {2020}, subject = {Linse}, language = {en} } @misc{SchwarzHellmann2021, author = {Schwarz, Simon and Hellmann, Ralf}, title = {Rapid laser fabrication of complex glass optics}, series = {International Research Days}, journal = {International Research Days}, year = {2021}, abstract = {Poster}, subject = {Laserbearbeitung}, language = {en} } @article{SchwarzRungEsenetal.2021, author = {Schwarz, Simon and Rung, Stefan and Esen, Cemal and Hellmann, Ralf}, title = {Enhanced ablation efficiency using GHz bursts in micromachining fused silica}, series = {Optics Letters}, volume = {46}, journal = {Optics Letters}, number = {2}, pages = {282 -- 285}, year = {2021}, subject = {Fr{\"a}sen}, language = {de} } @article{SchwarzGoetzendorferRungetal.2021, author = {Schwarz, Simon and G{\"o}tzendorfer, Babette and Rung, Stefan and Esen, Cemal and Hellmann, Ralf}, title = {Compact Beam Homogenizer Module with Laser-Fabricated Lens-Arrays}, series = {applied sciences}, volume = {2021}, journal = {applied sciences}, number = {11}, pages = {1018 -- 1018}, year = {2021}, subject = {Femtosekundenlaser}, language = {en} } @article{SchwarzRungEsenetal.2021, author = {Schwarz, Simon and Rung, Stefan and Esen, Cemal and Hellmann, Ralf}, title = {Ultrashort pulsed laser backside ablation of fused silica}, series = {Optics Express}, volume = {29}, journal = {Optics Express}, number = {15}, pages = {23477 -- 23486}, year = {2021}, subject = {Femtosekundenlaser}, language = {de} } @article{RungBokanRutschetal.2018, author = {Rung, Stefan and Bokan, Kevin and Rutsch, Kevin and Schwarz, Simon and Esen, Cemal and Hellmann, Ralf}, title = {Laser Induced Periodic Surface Structures on 100Cr6 Steel for Modification of Friction Demonstrated with Stribeck Test}, series = {Journal of Laser Micro/Nanoengineering}, volume = {13}, journal = {Journal of Laser Micro/Nanoengineering}, number = {3}, doi = {10.2961/jlmn.2018.03.0004}, pages = {160 -- 165}, year = {2018}, abstract = {In this contribution, we report on surface functionalization by introducing laser induced periodic surface structures on 100Cr6 bearing steel to modify complex tribological properties. The advanced approach of this study is the measurement of the coefficient of friction by performing a ball-on-disk Stribeck test on laser structured surfaces with polytetrafluoroethylene balls in a lubricant environment. The Stribeck test reveals the modified friction behavior using translation speeds up to 106 mm/min and load forces between 100 mN and 5000 mN. Our results show increased stiction and coefficient of friction for laser structured surfaces in the regime of boundary lubrication which is attributed to the laser induced surface asperities. Decreased coefficient of friction is observed in the regime of mixed and hydrodynamic lubrication, i.e. for velocities higher than 1000 mm/min, for surfaces covered by laser induced periodic surface structures with low spatial frequency.}, subject = {Laser}, language = {en} } @article{SchwarzRungHellmann2016, author = {Schwarz, Simon and Rung, Stefan and Hellmann, Ralf}, title = {Generation of laser-induced periodic surface structures on transparent material-fused silica}, series = {Applied Physics Letters}, volume = {108}, journal = {Applied Physics Letters}, number = {18}, pages = {181607 -- 181607}, year = {2016}, subject = {Laser}, language = {en} } @article{SchwarzRungEsenetal.2018, author = {Schwarz, Simon and Rung, Stefan and Esen, Cemal and Hellmann, Ralf}, title = {Fabrication of a high-quality axicon by femtosecond laser ablation and CO2 laser polishing for quasi-Bessel beam generation}, series = {Optics Express}, volume = {26}, journal = {Optics Express}, number = {18}, pages = {23287 -- 23294}, year = {2018}, subject = {Femtosekundenlaser}, language = {en} } @article{SchwarzRungHellmann2017, author = {Schwarz, Simon and Rung, Stefan and Hellmann, Ralf}, title = {One-dimensional low spatial frequency LIPSS with rotating orientation on fused silica}, series = {Applied Surface Science}, volume = {2017}, journal = {Applied Surface Science}, number = {411}, pages = {113 -- 116}, year = {2017}, subject = {Quarzglas}, language = {en} } @article{SchwarzHellmann2017, author = {Schwarz, Simon and Hellmann, Ralf}, title = {Fabrication of Cylindrical Lenses by Combining Ultrashort Pulsed Laser and CO2 Laser}, series = {Journal of Laser Micro/Nanoengineering}, volume = {12}, journal = {Journal of Laser Micro/Nanoengineering}, number = {2}, pages = {76 -- 79}, year = {2017}, subject = {Zylinderlinse}, language = {en} } @article{SchwarzRungEsenetal.2018, author = {Schwarz, Simon and Rung, Stefan and Esen, Cemal and Hellmann, Ralf}, title = {Influence of pulse duration on high-precision manufacturing of 3D geometries}, series = {Journal of Laser Micro/Nanoengineering}, volume = {13}, journal = {Journal of Laser Micro/Nanoengineering}, number = {3}, pages = {292 -- 295}, year = {2018}, subject = {Dreidimensionale Geometrie}, language = {en} } @article{SchwarzRungEsenetal.2018, author = {Schwarz, Simon and Rung, Stefan and Esen, Cemal and Hellmann, Ralf}, title = {Homogeneous low spatial frequency LIPSS on dielectric materials generated by beam-shaped femtosecond pulsed laser irradiation}, series = {Journal of Laser Micro/Nanoengineering}, volume = {13}, journal = {Journal of Laser Micro/Nanoengineering}, number = {2}, pages = {90 -- 94}, year = {2018}, subject = {Femtosekundenlaser}, language = {en} } @article{SchwarzRungEsenetal.2020, author = {Schwarz, Simon and Rung, Stefan and Esen, Cemal and Hellmann, Ralf}, title = {Rapid fabrication of precise glass axicon arrays by an all laser-based manufacturing technology}, series = {Journal of Laser Applications}, volume = {32}, journal = {Journal of Laser Applications}, number = {1}, pages = {012001 -- 012001}, year = {2020}, subject = {Femtosekundenlaser}, language = {en} } @article{SchwarzRungEsenetal.2018, author = {Schwarz, Simon and Rung, Stefan and Esen, Cemal and Hellmann, Ralf}, title = {Surface Plasmon Polariton Triggered Generation of 1D-Low Spatial Frequency LIPSS on Fused Silica}, series = {Applied Sciences}, volume = {8}, journal = {Applied Sciences}, number = {9}, pages = {1624 -- 1624}, year = {2018}, subject = {Femtosekundenlaser}, language = {en} } @article{RungBokanSchwarzetal.2020, author = {Rung, Stefan and Bokan, Kevin and Schwarz, Simon and Esen, Cemal and Hellmann, Ralf}, title = {Influence of laser wavelength on the modification of friction between 100Cr6 steel and polytetrafluoroethylene by femtosecond laser-induced periodic surface structures}, series = {Journal of Laser Applications}, volume = {32}, journal = {Journal of Laser Applications}, number = {3}, doi = {10.2351/7.0000036}, pages = {032017-1 -- 032017-6}, year = {2020}, subject = {Femtosekundenlaser}, language = {en} } @article{SchwarzRothRungetal.2020, author = {Schwarz, Simon and Roth, Gian-Luca and Rung, Stefan and Esen, Cemal and Hellmann, Ralf}, title = {Fabrication and evaluation of negative axicons for ultrashort pulsed laser applications}, series = {Optics Express}, volume = {Optics Express}, journal = {Optics Express}, number = {28}, pages = {26207 -- 26217}, year = {2020}, subject = {Ultrakurzzeitlaser}, language = {en} } @inproceedings{SchwarzRungEsenetal.2020, author = {Schwarz, Simon and Rung, Stefan and Esen, Cemal and Hellmann, Ralf}, title = {Manufacturing of optical elements by non-contact laser processing}, series = {Seventh European Seminar on Precision Optics Manufacturing, Proceedings}, booktitle = {Seventh European Seminar on Precision Optics Manufacturing, Proceedings}, number = {11478}, year = {2020}, subject = {Laserbearbeitung}, language = {en} } @article{DudutisPipirasSchwarzetal.2020, author = {Dudutis, Juozas and Pipiras, Jokūbas and Schwarz, Simon and Rung, Stefan and Hellmann, Ralf and Račiukaitis, Gediminas and Gečys, Paulius}, title = {Laser-fabricated axicons challenging the conventional optics in glass processing applications}, series = {Optics Express}, volume = {28}, journal = {Optics Express}, number = {4}, pages = {5715 -- 5730}, year = {2020}, subject = {Laserbearbeitung}, language = {en} } @article{SchwarzRungHellmann2017, author = {Schwarz, Simon and Rung, Stefan and Hellmann, Ralf}, title = {Two-Dimensional Low Spatial Frequency Laser-Induced Periodic Surface Structuring of Sapphire}, series = {Journal of Laser Micro/Nanoengineering}, volume = {12}, journal = {Journal of Laser Micro/Nanoengineering}, number = {2}, pages = {67 -- 71}, year = {2017}, subject = {Femtosekundenlaser}, language = {en} } @inproceedings{SchwarzRungEsenetal.2020, author = {Schwarz, Simon and Rung, Stefan and Esen, Cemal and Hellmann, Ralf}, title = {All laser-based fabrication of optical elements}, series = {Proceedings of SPIE 11270, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XX}, booktitle = {Proceedings of SPIE 11270, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XX}, year = {2020}, subject = {Ultrakurzzeitlaser}, language = {de} }