TY - JOUR A1 - Adelmann, Benedikt A1 - Hellmann, Ralf T1 - Process optimization of laser fusion cutting of multilayer stacks of electrical sheets JF - International Journal of Advanced Manufacturing Technology KW - Laserschneiden Y1 - 2013 VL - 68 SP - 2693 EP - 2701 ER - TY - CHAP A1 - Hasenstab, Stefan A1 - Adelmann, Benedikt A1 - Hellmann, Ralf T1 - Laser Cutting of Alumina and Aluminum Nitride with a 500 W Single Mode Fiber Laser T2 - XXVII. microCAD International Scientific Conference KW - Laserschneiden KW - Aluminiumoxide Y1 - 2013 ER - TY - JOUR A1 - Adelmann, Benedikt A1 - Hürner, Andreas A1 - Schlegel, Tobias A1 - Bauer, Anton A1 - Frey, Lothar A1 - Hellmann, Ralf T1 - Laser Alloying Nickel on 4H-Silicon Carbide Substrate to Generate Ohmic Contacts JF - Journal of Laser Micro/Nanoengineering KW - Ohm-Kontakt KW - Nickellegierung Y1 - 2013 VL - 8 IS - 1 SP - 97 EP - 101 ER - TY - JOUR A1 - Hürner, Andreas A1 - Schlegel, Tobias A1 - Adelmann, Benedikt A1 - Mitlehner, Heinz A1 - Hellmann, Ralf A1 - Bauer, Anton A1 - Frey, Lothar T1 - Alloying of Ohmic Contacts to n-type 4H-SiC via Laser Irradiation JF - Materials Science Forum KW - Ohm-Kontakt KW - Legierung KW - Laser Y1 - 2013 VL - 740-742 SP - 773 EP - 776 ER - TY - CHAP A1 - Kalmár, László A1 - Hellmann, Ralf A1 - Régert, Tamás A1 - Varga, Zoltan T1 - Numerical simulation of heat transfer procedure in high power LED modules T2 - Proceedings of the 12th technical and scientific meeting KW - Lumineszenzdiode KW - Wärmeübertragung KW - Simulation Y1 - 2011 SP - 18 EP - 20 ER - TY - JOUR A1 - Belle, Stefan A1 - Scheurich, Steffen A1 - Hellmann, Ralf A1 - So, Sik A1 - Sparrow, Ian A1 - Emmerson, Greg T1 - Refractive index sensing for online monitoring water and ethanol contents in biofuels JF - Sensors KW - Biokraftstoff Y1 - 2014 U6 - https://doi.org/10.1117/12.853849 SN - 1424-8220 IS - 7726 ER - TY - CHAP A1 - Glaab, Johannes A1 - Hellmann, Ralf T1 - Small-scale low-through UV-C LED disinfection device, in waste processing and recycling T2 - Proceedings of the XXIV international Scientific conference Miskolc, Ungarn KW - Lumineszenzdiode KW - Desinfektionsapparat Y1 - 2014 ER - TY - JOUR A1 - Gockel, Tilo A1 - Engel, Michael A1 - Hellmann, Ralf T1 - 3D Laserscanning mit Linienlaser und Smart Camera – Systemauslegung mit Rasterlinsenoptik und Scheimpflugentzerrung JF - Elektor Sonderheft LEDs 3 KW - Laserscanner Y1 - 2011 IS - 9 SP - 79 EP - 84 ER - TY - JOUR A1 - Schneider, Johannes A1 - Bochtler, Ulrich A1 - Hellmann, Ralf A1 - Kaloudis, Michael A1 - Gockel, Tilo T1 - Effiziente Entwärmung eines Hochleistungs-UV-LED-Moduls JF - Elektor, Sonderheft LEDs 3 KW - Lumineszenzdiode Y1 - 2011 VL - 2011 IS - 9 SP - 12 EP - 17 ER - TY - CHAP A1 - Heilmann, Eva-Maria A1 - Hellmann, Ralf T1 - Water jet guided laser cutting using a green disc laser T2 - Proceeding XXV microCAD, International scientific conference, 2011, Section K: Material science/Material processing technologies KW - Wasserstrahlschneiden KW - Laserbearbeitung Y1 - 2014 ER - TY - JOUR A1 - Adelmann, Benedikt A1 - Hellmann, Ralf T1 - Investigation on Flexural Strength during Fiber Laser Cutting of Alumina JF - Physics Procedia KW - Faserlaser KW - Biegefestigkeit Y1 - 2013 VL - 41 SP - 405 EP - 407 ER - TY - JOUR A1 - Rung, Stefan A1 - Christiansen, Anne A1 - Hellmann, Ralf T1 - Influence of film thickness on laser ablation threshold of transparent conducting oxide thin-films JF - Applied Surface Science KW - Laserablation KW - Dünnschichttechnik Y1 - 2014 VL - 305 SP - 347 EP - 351 ER - TY - CHAP A1 - Rung, Stefan A1 - Bischoff, Christian A1 - Jäger, Erwin A1 - Umhofer, Udo A1 - Hellmann, Ralf T1 - Laser thin film ablation with multiple beams and tailored beam profiles T2 - Proceedings of SPIE 8967, Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XIX KW - Thin film KW - Ablation KW - Top-Hat KW - Parallel Processing KW - Beam-Splitter KW - Laserablation KW - Dünnschichttechnik Y1 - 2014 VL - 8967 ER - TY - JOUR A1 - Rung, Stefan A1 - Rexhepi, Mal A1 - Bischoff, Christian A1 - Hellmann, Ralf T1 - Laserscribing of thin films using top-hat laser beam profiles JF - Journal of Laser Micro/Nanoengineering KW - Laser scribing KW - laser beam shaping KW - Top-Hat KW - Dünne Schicht KW - Laser Y1 - 2013 VL - 8 IS - 3 SP - 309 EP - 314 ER - TY - CHAP A1 - Rung, Stefan A1 - Rexhepi, Mal A1 - Hellmann, Ralf T1 - Beam shaping for enhanced through-put of laser ablation of transparent conductive films T2 - Proceedings of the XXVII MicroCAD International Scientific Conference KW - Laserablation Y1 - 2013 VL - 2013 ER - TY - JOUR A1 - Bischoff, Christian A1 - Rung, Stefan A1 - Hellmann, Ralf T1 - Efficient micromachining of thin film layers with nanosecond lasers – beam shaping optics improve process quality and enhance throughput JF - Laser Technik Journal KW - Laser KW - Nanosekundenbereich KW - Dünne Schicht Y1 - 2012 VL - 9 IS - 5 SP - 15 EP - 20 ER - TY - CHAP A1 - Rosenberger, Markus A1 - Belle, Stefan A1 - Hellmann, Ralf T1 - Detection of unlabeled DNA hybridization with a planar Bragg Grating Sensor T2 - XXV International MicroCAD Conference – Sensing Technologies, Miskolc (Hungary) KW - Bragg-Reflektor Y1 - 2014 IS - Section R SP - 67 EP - 72 ER - TY - JOUR A1 - Amrhein, Frank A1 - Kehrer, Martin A1 - Schreck, Timo A1 - Bochtler, Ulrich A1 - Hellmann, Ralf A1 - Kaloudis, Michael T1 - UV-LED-Bestrahlung von Vergussmaterial: Schnelle Aushärtung auch im Schatten JF - adhäsion KLEBEN & DICHTEN KW - Lumineszenzdiode Y1 - 2011 IS - 5 SP - 38 EP - 41 ER - TY - JOUR A1 - Risch, Anna A1 - Hellmann, Ralf T1 - Laser Scribing of Gallium Doped Zinc Oxide Thin Films using Picosecond Laser JF - Applied Surface Science KW - Zinkoxid KW - Dünne Schicht KW - Laser Y1 - 2014 VL - 258 IS - 5 SP - 1849 EP - 1853 ER - TY - JOUR A1 - Hellmann, Ralf A1 - Moorhouse, Colin T1 - Laser patterning of transparent electrode films, from solar panels through high-end display JF - Industrial Laser Solutions Magazine KW - Sonnenkollektor KW - Laser Y1 - 2014 IS - 11 ER -