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 - TY - JOUR A1 - Heilmann, Eva-Maria A1 - Hellmann, Ralf A1 - Seidl, Albrecht T1 - Water Jet Guided Laser Cutting of Silicon Thin Films Using 515nm Disc Laser JF - Journal of Laser Micro/Nanoengineering KW - Laserschneiden KW - Dünne Schicht Y1 - 2014 VL - 6 IS - 2 SP - 168 ER - TY - JOUR A1 - Adelmann, Benedikt A1 - Hellmann, Ralf T1 - Fast Laser Cutting Optimization Algorithm JF - Physics Procedia 12-1, Elsevier Properties S.A KW - Laserschneiden KW - Optimierung Y1 - 2011 VL - 12 IS - Part A SP - 591 EP - 598 ER - TY - JOUR A1 - Risch, Anna A1 - Hellmann, Ralf T1 - Picosecond Laser Patterning of ITO Thin Films JF - Physics Procedia 12-1, Elsevier Properties S.A KW - Laserbearbeitung KW - Dünne Schicht Y1 - 2014 IS - 12 SP - 133 EP - 140 ER - TY - CHAP A1 - Heilmann, Eva-Maria A1 - Hellmann, Ralf T1 - High Speed Fibre Laser Material processing of Stainless Steel Tapes Under Tension T2 - XXV International MicroCAD Conference - Material Processing Technologies, Miskolc (Hungary), 21-25 KW - Lasertechnologie Y1 - 2011 ER - TY - CHAP A1 - Adelmann, Benedikt A1 - Hellmann, Ralf T1 - Different modulation schemes in fibre laser cutting T2 - Proceeding XXV microCAD, International scientific conference, 2011, Section K: Material science/Material processing technologies KW - Laserschneiden KW - Faserlaser Y1 - 2014 SP - 1 EP - 6 ER - TY - CHAP A1 - Adelmann, Benedikt A1 - Hellmann, Ralf T1 - DOE based optimization of fibre laser cutting of metals T2 - Proceeding XXV microCAD, International scientific conference, 2011, Section K: Material science/Material processing technologies KW - Laserschneiden KW - Faserlaser Y1 - 2014 SP - 7 EP - 12 ER - TY - CHAP A1 - Risch, Anna A1 - Hellmann, Ralf T1 - Laser induced modification of GZO thin film T2 - Proceeding XXV microCAD, International scientific conference, 2011, Section K: Material science/Material processing technologies KW - Laser KW - Dünne Schicht Y1 - 2014 SP - 69 EP - 74 ER - TY - CHAP A1 - Risch, Anna A1 - Hellmann, Ralf T1 - ITO thin film laser patterning by picosecond laser T2 - Proceeding XXV microCAD, International scientific conference, 2011, Section K: Material science/Material processing technologies KW - Laserbearbeitung Y1 - 2014 SP - 63 EP - 68 ER - TY - CHAP A1 - Rosenberger, Manuel A1 - Belle, Stefan A1 - Hellmann, Ralf T1 - Optical interrogation of chemical and temperature bragg grating sensors using tunable fiber coupled bandpass filter T2 - Proceeding XXV microCAD, International scientific conference, 2011, Section H KW - Bragg-Reflektor Y1 - 2014 SP - 25 EP - 30 ER - TY - CHAP A1 - Belle, Stefan A1 - Rosenberger, Manuel A1 - Hellmann, Ralf T1 - Optical fibre sensing in the production process and storage of biofuels T2 - Proceeding XXV microCAD, International scientific conference, 2011, Section A KW - Biokraftstoff Y1 - 2014 SP - 21 EP - 26 ER - TY - JOUR A1 - Belle, Stefan A1 - Rosenberger, Manuel A1 - Hellmann, Ralf T1 - Evanescent wave planar bragg grating sensor for real-time detection of unlabelled biomolecules JF - Optics Express KW - Bragg-Reflektor KW - Biomolekül Y1 - 2014 ER - TY - JOUR A1 - Girschikofsky, Maiko A1 - Rosenberger, Manuel A1 - Belle, Stefan A1 - Brutschy, Malte A1 - Waldvogel, Siegfried A1 - Hellmann, Ralf T1 - Optical planar bragg grating sensor for real-time detection of benzene, toluene und xylene in solvent vapour JF - Sensors & Actuators, B - Chemical KW - Bragg-Reflektor Y1 - 2014 VL - 171/172 IS - 8/9 SP - 338 EP - 342 ER - TY - JOUR A1 - Girschikofsky, Maiko A1 - Rosenberger, Manuel A1 - Belle, Stefan A1 - Brutschy, Malte A1 - Waldvogel, Siegfried A1 - Hellmann, Ralf T1 - Highly sensitive detection of naphthalene in solvent vapor using a functionalized PBG refractive index sensor JF - Sensors KW - Bragg-Reflektor KW - Sensor Y1 - 2014 U6 - https://doi.org/10.3390/s120202018 VL - 12 IS - 2 SP - 2018 EP - 2025 ER - TY - CHAP A1 - Rosenberger, Manuel A1 - Belle, Stefan A1 - Hellmann, Ralf T1 - Detection of biochemical reaction and DNA hybridization using a planar bragg grating sensor T2 - Proceeding SPIE, Vol. 8073, article id: 80730C KW - Bragg-Reflektor KW - Sensor Y1 - 2014 U6 - https://doi.org/10.1117/12.886785 IS - 8073 ER - TY - JOUR A1 - Risch, Anna A1 - Christiansen, Anne A1 - Hellmann, Ralf A1 - Gockel, Tilo T1 - Laserstrukturierung vonTCOs zur Herstellung organischer Leuchtdioden JF - Elektor, Sonderheft LEDs 3 KW - Transparent-leitendes Oxid KW - Lumineszenzdiode KW - Laserbearbeitung Y1 - 2011 IS - 9 SP - 39 EP - 41 ER - TY - JOUR A1 - Amrhein, Frank A1 - Kehrer, Martin A1 - Schreck, Timo A1 - Bochtler, Ulrich A1 - Hellmann, Ralf A1 - Kaloudis, Michael T1 - More efficient curing of UV sensitive mounting materials JF - Practical metallography KW - Aushärtung Y1 - 2014 VL - 48 IS - 7 SP - 356 EP - 364 ER - TY - CHAP A1 - Risch, Anna A1 - Hühnlein, Kristof A1 - Knöll, Jürgen A1 - Hellmann, Ralf T1 - Laserscribing of transparent conductive oxides - a comparative study using nanosecond and picosecond pulsed solid state lasers T2 - Proceedings of the 20st International Scientific Conference, Mittweida, 2009 KW - Festkörperlaser Y1 - 2014 ER - TY - CHAP A1 - Kaloumenos, Mareiki A1 - Amrhein, Frank A1 - Glaab, Johannes A1 - Sauer, Michael A1 - Hellmann, Ralf A1 - Kaloudis, Michael T1 - Development of a UV-Light Source with Highest Power Density Based on Light Emitting Diode Technology for Applications in Production Engineering, in Production Engineering and manufacturing Systems T2 - Proceedings of the XXIV International Scientific Conference Miskolc, Ungarn KW - Lumineszenzdiode Y1 - 2010 ER - TY - JOUR A1 - Hellmann, Ralf A1 - Glaab, Johannes A1 - Gockel, Tilo T1 - Wasserentkeimung mit UV-Leuchtdioden JF - Elektor Sonderheft, LEDs 2 KW - Wasseraufbereitung KW - Lumineszenzdiode Y1 - 2010 VL - 2010 IS - 2 SP - 40 EP - 45 PB - Elektor-Verlag CY - Aachen ER - TY - JOUR A1 - Bochtler, Ulrich A1 - Hellmann, Ralf A1 - Kaloudis, Michael A1 - Amrhein, Frank A1 - Glaab, Johannes A1 - Kaloumenos, Mareiki A1 - Sauer, Michael A1 - Gockel, Tilo T1 - LUVLED - UV-Leistungslichtquelle auf Leuchtdiodenbasis JF - Elektor Sonderheft, LEDs 2 KW - Lumineszenzdiode Y1 - 2010 VL - 2011 IS - 2 SP - 57 EP - 63 PB - Elektor-Verlag CY - Aachen ER - TY - JOUR A1 - Amrhein, Frank A1 - Bochtler, Ulrich A1 - Hellmann, Ralf A1 - Kaloudis, Michael A1 - Kaloumenos, Mareiki T1 - Vergleich der thermischen Eigenschaften unterschiedlicher insulated metal substrat-Leiterplatten JF - PLUS, Leiterplattentechnik KW - Gedruckte Schaltung KW - Trägersubstanz Y1 - 2010 IS - 8 SP - 1758 PB - Hanser Verlag CY - München ER - TY - JOUR A1 - Heilmann, Eva-Maria A1 - Kowalski, Thomas A1 - Hellmann, Ralf A1 - Teigelkötter, Johannes T1 - Water Jet Guided Laser Cutting of High Temperature Superconductors JF - Journal of Laser Micro/Nanoengineering KW - laser KW - Laserschneiden Y1 - 2013 U6 - https://doi.org/10.2961/jlmn.2013.01.0014 VL - 8 IS - 1 SP - 70 EP - 74 ER - TY - JOUR A1 - Hellmann, Ralf A1 - Gockel, Tilo T1 - Optische Charakterisierung von Leuchtdioden JF - Zeitschrift ELEKTOR, Sonderheft LED-Special 4 – Leuchtdioden in Theorie und Praxis, 2012 KW - Leuchtdioden KW - Lumineszenzdiode Y1 - 2012 IS - 9 SP - 40 EP - 46 ER - TY - CHAP A1 - Kalmár, László A1 - Hellmann, Ralf A1 - Régert, Tamás A1 - Varga, Zoltan T1 - Numerical investigation of unsteady heat transport procedure in high power LED module T2 - GEP KW - LED module KW - Lumineszenzdiode Y1 - 2012 VL - 2012 IS - 1 SP - 43 EP - 46 ER - TY - JOUR A1 - Schneider, Johannes A1 - Bochtler, Ulrich A1 - Hellmann, Ralf A1 - Kaloudis, Michael A1 - Gockel, Tilo T1 - LUVLED III – Optimierung eines Kühlkonzeptes zur Aktivluftkühlung eines Hochleistungs-UV-LED-Moduls JF - Zeitschrift ELEKTOR, Sonderheft LED-Special 4 – Leuchtdioden in Theorie und Praxis, 2012 KW - UV-LED Modul KW - Lumineszenzdiode Y1 - 2012 IS - 9 SP - 20 EP - 29 ER - TY - CHAP A1 - Hühnlein, Kristof A1 - Tschirpke, Katrin A1 - Hellmann, Ralf T1 - Optimisation of laser cutting using design of experiment - A comparative study of cutting thin ceramic layers using a fibre laser and a CO2 laser T2 - Physics procedia T2 - 6th international conference on laser assisted net shape engineering KW - Laserschneiden Y1 - 2014 SN - 1875-3892 VL - 5 IS - Part B SP - 243 EP - 252 ER - TY - JOUR A1 - Risch, Anna A1 - Hühnlein, Kristof A1 - Knöll, Jürgen A1 - Hellmann, Ralf T1 - Picosecond and nanosecond pulsed laserscribing on transparent conductive indium tin oxide JF - Journal of Material processing technolgies JF - Proceedings of the XXIV international scientific conference Miskolc, Ungarn KW - Laserbearbeitung Y1 - 2014 SN - 0924-0136 ER - TY - JOUR A1 - Bochtler, Ulrich A1 - Hellmann, Ralf A1 - Kaloudis, Michael T1 - Neuartige UV-Lichtquelle auf Leuchtdiodenbasis, Packaging und Hybridschaltungen JF - PLUS KW - Lumineszenzdiode Y1 - 2010 IS - 2 PB - Leuze-Verlag ER - TY - CHAP A1 - Glaab, Johannes A1 - Hellmann, Ralf T1 - Germicidal potential of ultraviolet-LED emitting different wavelength for the inactivation of indigenous coliform bacteria T2 - Water research conference, Lissabon, Portugal KW - Lumineszenzdiode KW - Kolibakterium Y1 - 2014 ER - TY - CHAP A1 - Rosenberger, Manuel A1 - Belle, Stefan A1 - Hellmann, Ralf T1 - Optical interrogation of bragg grating sensors using tunable fibre based bandpass filter T2 - Proceedings of the 20st international science conference, Mittweida KW - Bragg-Reflektor KW - Sensor Y1 - 2014 ER -