@article{AdelmannHellmann2013, author = {Adelmann, Benedikt and Hellmann, Ralf}, title = {Process optimization of laser fusion cutting of multilayer stacks of electrical sheets}, series = {International Journal of Advanced Manufacturing Technology}, volume = {68}, journal = {International Journal of Advanced Manufacturing Technology}, pages = {2693 -- 2701}, year = {2013}, subject = {Laserschneiden}, language = {en} } @inproceedings{HasenstabAdelmannHellmann2013, author = {Hasenstab, Stefan and Adelmann, Benedikt and Hellmann, Ralf}, title = {Laser Cutting of Alumina and Aluminum Nitride with a 500 W Single Mode Fiber Laser}, series = {XXVII. microCAD International Scientific Conference}, booktitle = {XXVII. microCAD International Scientific Conference}, year = {2013}, subject = {Laserschneiden}, language = {en} } @article{AdelmannHuernerSchlegeletal.2013, author = {Adelmann, Benedikt and H{\"u}rner, Andreas and Schlegel, Tobias and Bauer, Anton and Frey, Lothar and Hellmann, Ralf}, title = {Laser Alloying Nickel on 4H-Silicon Carbide Substrate to Generate Ohmic Contacts}, series = {Journal of Laser Micro/Nanoengineering}, volume = {8}, journal = {Journal of Laser Micro/Nanoengineering}, number = {1}, pages = {97 -- 101}, year = {2013}, subject = {Ohm-Kontakt}, language = {en} } @article{HuernerSchlegelAdelmannetal.2013, author = {H{\"u}rner, Andreas and Schlegel, Tobias and Adelmann, Benedikt and Mitlehner, Heinz and Hellmann, Ralf and Bauer, Anton and Frey, Lothar}, title = {Alloying of Ohmic Contacts to n-type 4H-SiC via Laser Irradiation}, series = {Materials Science Forum}, volume = {740-742}, journal = {Materials Science Forum}, pages = {773 -- 776}, year = {2013}, subject = {Ohm-Kontakt}, language = {de} } @inproceedings{KalmarHellmannRegertetal.2011, author = {Kalm{\´a}r, L{\´a}szl{\´o} and Hellmann, Ralf and R{\´e}gert, Tam{\´a}s and Varga, Zoltan}, title = {Numerical simulation of heat transfer procedure in high power LED modules}, series = {Proceedings of the 12th technical and scientific meeting}, booktitle = {Proceedings of the 12th technical and scientific meeting}, pages = {18 -- 20}, year = {2011}, subject = {Lumineszenzdiode}, language = {en} } @article{BelleScheurichHellmannetal.2010, author = {Belle, Stefan and Scheurich, Steffen and Hellmann, Ralf and So, Sik and Sparrow, Ian and Emmerson, Greg}, title = {Refractive index sensing for online monitoring water and ethanol contents in biofuels}, series = {Sensors}, journal = {Sensors}, number = {7726}, issn = {1424-8220}, doi = {10.1117/12.853849}, year = {2010}, subject = {Biokraftstoff}, language = {en} } @inproceedings{GlaabHellmann2010, author = {Glaab, Johannes and Hellmann, Ralf}, title = {Small-scale low-through UV-C LED disinfection device, in waste processing and recycling}, series = {Proceedings of the XXIV international Scientific conference Miskolc, Ungarn}, booktitle = {Proceedings of the XXIV international Scientific conference Miskolc, Ungarn}, year = {2010}, subject = {Lumineszenzdiode}, language = {en} } @article{GockelEngelHellmann2011, author = {Gockel, Tilo and Engel, Michael and Hellmann, Ralf}, title = {3D Laserscanning mit Linienlaser und Smart Camera - Systemauslegung mit Rasterlinsenoptik und Scheimpflugentzerrung}, series = {Elektor Sonderheft LEDs 3}, journal = {Elektor Sonderheft LEDs 3}, number = {9}, pages = {79 -- 84}, year = {2011}, subject = {Laserscanner}, language = {de} } @article{SchneiderBochtlerHellmannetal.2011, author = {Schneider, Johannes and Bochtler, Ulrich and Hellmann, Ralf and Kaloudis, Michael and Gockel, Tilo}, title = {Effiziente Entw{\"a}rmung eines Hochleistungs-UV-LED-Moduls}, series = {Elektor, Sonderheft LEDs 3}, volume = {2011}, journal = {Elektor, Sonderheft LEDs 3}, number = {9}, pages = {12 -- 17}, year = {2011}, subject = {Lumineszenzdiode}, language = {de} } @inproceedings{HeilmannHellmann2011, author = {Heilmann, Eva-Maria and Hellmann, Ralf}, title = {Water jet guided laser cutting using a green disc laser}, series = {Proceeding XXV microCAD, International scientific conference, 2011, Section K: Material science/Material processing technologies}, booktitle = {Proceeding XXV microCAD, International scientific conference, 2011, Section K: Material science/Material processing technologies}, year = {2011}, subject = {Wasserstrahlschneiden}, language = {en} } @article{AdelmannHellmann2013, author = {Adelmann, Benedikt and Hellmann, Ralf}, title = {Investigation on Flexural Strength during Fiber Laser Cutting of Alumina}, series = {Physics Procedia}, volume = {41}, journal = {Physics Procedia}, pages = {405 -- 407}, year = {2013}, subject = {Faserlaser}, language = {de} } @article{RungChristiansenHellmann2014, author = {Rung, Stefan and Christiansen, Anne and Hellmann, Ralf}, title = {Influence of film thickness on laser ablation threshold of transparent conducting oxide thin-films}, series = {Applied Surface Science}, volume = {305}, journal = {Applied Surface Science}, pages = {347 -- 351}, year = {2014}, subject = {Laserablation}, language = {en} } @inproceedings{RungBischoffJaegeretal.2014, author = {Rung, Stefan and Bischoff, Christian and J{\"a}ger, Erwin and Umhofer, Udo and Hellmann, Ralf}, title = {Laser thin film ablation with multiple beams and tailored beam profiles}, series = {Proceedings of SPIE 8967, Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XIX}, volume = {8967}, booktitle = {Proceedings of SPIE 8967, Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XIX}, year = {2014}, subject = {Laserablation}, language = {en} } @article{RungRexhepiBischoffetal.2013, author = {Rung, Stefan and Rexhepi, Mal and Bischoff, Christian and Hellmann, Ralf}, title = {Laserscribing of thin films using top-hat laser beam profiles}, series = {Journal of Laser Micro/Nanoengineering}, volume = {8}, journal = {Journal of Laser Micro/Nanoengineering}, number = {3}, pages = {309 -- 314}, year = {2013}, subject = {D{\"u}nne Schicht}, language = {en} } @inproceedings{RungRexhepiHellmann2013, author = {Rung, Stefan and Rexhepi, Mal and Hellmann, Ralf}, title = {Beam shaping for enhanced through-put of laser ablation of transparent conductive films}, series = {Proceedings of the XXVII MicroCAD International Scientific Conference}, volume = {2013}, booktitle = {Proceedings of the XXVII MicroCAD International Scientific Conference}, year = {2013}, subject = {Laserablation}, language = {en} } @article{BischoffRungHellmann2012, author = {Bischoff, Christian and Rung, Stefan and Hellmann, Ralf}, title = {Efficient micromachining of thin film layers with nanosecond lasers - beam shaping optics improve process quality and enhance throughput}, series = {Laser Technik Journal}, volume = {9}, journal = {Laser Technik Journal}, number = {5}, pages = {15 -- 20}, year = {2012}, subject = {Laser}, language = {en} } @inproceedings{RosenbergerBelleHellmann2011, author = {Rosenberger, Markus and Belle, Stefan and Hellmann, Ralf}, title = {Detection of unlabeled DNA hybridization with a planar Bragg Grating Sensor}, series = {XXV International MicroCAD Conference - Sensing Technologies, Miskolc (Hungary)}, booktitle = {XXV International MicroCAD Conference - Sensing Technologies, Miskolc (Hungary)}, number = {Section R}, pages = {67 -- 72}, year = {2011}, subject = {Bragg-Reflektor}, language = {en} } @article{AmrheinKehrerSchrecketal.2011, author = {Amrhein, Frank and Kehrer, Martin and Schreck, Timo and Bochtler, Ulrich and Hellmann, Ralf and Kaloudis, Michael}, title = {UV-LED-Bestrahlung von Vergussmaterial: Schnelle Aush{\"a}rtung auch im Schatten}, series = {adh{\"a}sion KLEBEN \& DICHTEN}, journal = {adh{\"a}sion KLEBEN \& DICHTEN}, number = {5}, pages = {38 -- 41}, year = {2011}, subject = {Lumineszenzdiode}, language = {de} } @article{RischHellmann2011, author = {Risch, Anna and Hellmann, Ralf}, title = {Laser Scribing of Gallium Doped Zinc Oxide Thin Films using Picosecond Laser}, series = {Applied Surface Science}, volume = {258}, journal = {Applied Surface Science}, number = {5}, pages = {1849 -- 1853}, year = {2011}, subject = {Zinkoxid}, language = {en} } @article{HellmannMoorhouse2011, author = {Hellmann, Ralf and Moorhouse, Colin}, title = {Laser patterning of transparent electrode films, from solar panels through high-end display}, series = {Industrial Laser Solutions Magazine}, journal = {Industrial Laser Solutions Magazine}, number = {11}, year = {2011}, subject = {Sonnenkollektor}, language = {en} } @article{HeilmannHellmannSeidl2011, author = {Heilmann, Eva-Maria and Hellmann, Ralf and Seidl, Albrecht}, title = {Water Jet Guided Laser Cutting of Silicon Thin Films Using 515nm Disc Laser}, series = {Journal of Laser Micro/Nanoengineering}, volume = {6}, journal = {Journal of Laser Micro/Nanoengineering}, number = {2}, pages = {168}, year = {2011}, subject = {Laserschneiden}, language = {en} } @article{AdelmannHellmann2011, author = {Adelmann, Benedikt and Hellmann, Ralf}, title = {Fast Laser Cutting Optimization Algorithm}, series = {Physics Procedia 12-1, Elsevier Properties S.A}, volume = {12}, journal = {Physics Procedia 12-1, Elsevier Properties S.A}, number = {Part A}, pages = {591 -- 598}, year = {2011}, subject = {Laserschneiden}, language = {en} } @article{RischHellmann2011, author = {Risch, Anna and Hellmann, Ralf}, title = {Picosecond Laser Patterning of ITO Thin Films}, series = {Physics Procedia 12-1, Elsevier Properties S.A}, journal = {Physics Procedia 12-1, Elsevier Properties S.A}, number = {12}, pages = {133 -- 140}, year = {2011}, subject = {Laserbearbeitung}, language = {en} } @inproceedings{HeilmannHellmann2011, author = {Heilmann, Eva-Maria and Hellmann, Ralf}, title = {High Speed Fibre Laser Material processing of Stainless Steel Tapes Under Tension}, series = {XXV International MicroCAD Conference - Material Processing Technologies, Miskolc (Hungary), 21-25}, booktitle = {XXV International MicroCAD Conference - Material Processing Technologies, Miskolc (Hungary), 21-25}, year = {2011}, subject = {Lasertechnologie}, language = {en} } @inproceedings{AdelmannHellmann2011, author = {Adelmann, Benedikt and Hellmann, Ralf}, title = {Different modulation schemes in fibre laser cutting}, series = {Proceeding XXV microCAD, International scientific conference, 2011, Section K: Material science/Material processing technologies}, booktitle = {Proceeding XXV microCAD, International scientific conference, 2011, Section K: Material science/Material processing technologies}, pages = {1 -- 6}, year = {2011}, subject = {Laserschneiden}, language = {en} } @inproceedings{AdelmannHellmann2011, author = {Adelmann, Benedikt and Hellmann, Ralf}, title = {DOE based optimization of fibre laser cutting of metals}, series = {Proceeding XXV microCAD, International scientific conference, 2011, Section K: Material science/Material processing technologies}, booktitle = {Proceeding XXV microCAD, International scientific conference, 2011, Section K: Material science/Material processing technologies}, pages = {7 -- 12}, year = {2011}, subject = {Laserschneiden}, language = {en} } @inproceedings{RischHellmann2011, author = {Risch, Anna and Hellmann, Ralf}, title = {Laser induced modification of GZO thin film}, series = {Proceeding XXV microCAD, International scientific conference, 2011, Section K: Material science/Material processing technologies}, booktitle = {Proceeding XXV microCAD, International scientific conference, 2011, Section K: Material science/Material processing technologies}, pages = {69 -- 74}, year = {2011}, subject = {Laser}, language = {en} } @inproceedings{RischHellmann2011, author = {Risch, Anna and Hellmann, Ralf}, title = {ITO thin film laser patterning by picosecond laser}, series = {Proceeding XXV microCAD, International scientific conference, 2011, Section K: Material science/Material processing technologies}, booktitle = {Proceeding XXV microCAD, International scientific conference, 2011, Section K: Material science/Material processing technologies}, pages = {63 -- 68}, year = {2011}, subject = {Laserbearbeitung}, language = {en} } @inproceedings{RosenbergerBelleHellmann2011, author = {Rosenberger, Manuel and Belle, Stefan and Hellmann, Ralf}, title = {Optical interrogation of chemical and temperature bragg grating sensors using tunable fiber coupled bandpass filter}, series = {Proceeding XXV microCAD, International scientific conference, 2011, Section H}, booktitle = {Proceeding XXV microCAD, International scientific conference, 2011, Section H}, pages = {25 -- 30}, year = {2011}, subject = {Bragg-Reflektor}, language = {en} } @inproceedings{BelleRosenbergerHellmann2011, author = {Belle, Stefan and Rosenberger, Manuel and Hellmann, Ralf}, title = {Optical fibre sensing in the production process and storage of biofuels}, series = {Proceeding XXV microCAD, International scientific conference, 2011, Section A}, booktitle = {Proceeding XXV microCAD, International scientific conference, 2011, Section A}, pages = {21 -- 26}, year = {2011}, subject = {Biokraftstoff}, language = {en} } @article{BelleRosenbergerHellmann2011, author = {Belle, Stefan and Rosenberger, Manuel and Hellmann, Ralf}, title = {Evanescent wave planar bragg grating sensor for real-time detection of unlabelled biomolecules}, series = {Optics Express}, journal = {Optics Express}, year = {2011}, subject = {Bragg-Reflektor}, language = {en} } @article{GirschikofskyRosenbergerBelleetal.2011, author = {Girschikofsky, Maiko and Rosenberger, Manuel and Belle, Stefan and Brutschy, Malte and Waldvogel, Siegfried and Hellmann, Ralf}, title = {Optical planar bragg grating sensor for real-time detection of benzene, toluene und xylene in solvent vapour}, series = {Sensors \& Actuators, B - Chemical}, volume = {171/172}, journal = {Sensors \& Actuators, B - Chemical}, number = {8/9}, pages = {338 -- 342}, year = {2011}, subject = {Bragg-Reflektor}, language = {en} } @article{GirschikofskyRosenbergerBelleetal.2011, author = {Girschikofsky, Maiko and Rosenberger, Manuel and Belle, Stefan and Brutschy, Malte and Waldvogel, Siegfried and Hellmann, Ralf}, title = {Highly sensitive detection of naphthalene in solvent vapor using a functionalized PBG refractive index sensor}, series = {Sensors}, volume = {12}, journal = {Sensors}, number = {2}, doi = {10.3390/s120202018}, pages = {2018 -- 2025}, year = {2011}, subject = {Bragg-Reflektor}, language = {en} } @inproceedings{RosenbergerBelleHellmann2011, author = {Rosenberger, Manuel and Belle, Stefan and Hellmann, Ralf}, title = {Detection of biochemical reaction and DNA hybridization using a planar bragg grating sensor}, series = {Proceeding SPIE, Vol. 8073, article id: 80730C}, booktitle = {Proceeding SPIE, Vol. 8073, article id: 80730C}, number = {8073}, doi = {10.1117/12.886785}, year = {2011}, subject = {Bragg-Reflektor}, language = {en} } @article{RischChristiansenHellmannetal.2011, author = {Risch, Anna and Christiansen, Anne and Hellmann, Ralf and Gockel, Tilo}, title = {Laserstrukturierung vonTCOs zur Herstellung organischer Leuchtdioden}, series = {Elektor, Sonderheft LEDs 3}, journal = {Elektor, Sonderheft LEDs 3}, number = {9}, pages = {39 -- 41}, year = {2011}, subject = {Transparent-leitendes Oxid}, language = {de} } @article{AmrheinKehrerSchrecketal.2011, author = {Amrhein, Frank and Kehrer, Martin and Schreck, Timo and Bochtler, Ulrich and Hellmann, Ralf and Kaloudis, Michael}, title = {More efficient curing of UV sensitive mounting materials}, series = {Practical metallography}, volume = {48}, journal = {Practical metallography}, number = {7}, pages = {356 -- 364}, year = {2011}, subject = {Aush{\"a}rtung}, language = {en} } @inproceedings{RischHuehnleinKnoelletal.2009, author = {Risch, Anna and H{\"u}hnlein, Kristof and Kn{\"o}ll, J{\"u}rgen and Hellmann, Ralf}, title = {Laserscribing of transparent conductive oxides - a comparative study using nanosecond and picosecond pulsed solid state lasers}, series = {Proceedings of the 20st International Scientific Conference, Mittweida, 2009}, booktitle = {Proceedings of the 20st International Scientific Conference, Mittweida, 2009}, year = {2009}, subject = {Festk{\"o}rperlaser}, language = {en} } @inproceedings{KaloumenosAmrheinGlaabetal.2010, author = {Kaloumenos, Mareiki and Amrhein, Frank and Glaab, Johannes and Sauer, Michael and Hellmann, Ralf and Kaloudis, Michael}, title = {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}, series = {Proceedings of the XXIV International Scientific Conference Miskolc, Ungarn}, booktitle = {Proceedings of the XXIV International Scientific Conference Miskolc, Ungarn}, year = {2010}, subject = {Lumineszenzdiode}, language = {en} } @article{HellmannGlaabGockel2010, author = {Hellmann, Ralf and Glaab, Johannes and Gockel, Tilo}, title = {Wasserentkeimung mit UV-Leuchtdioden}, series = {Elektor Sonderheft, LEDs 2}, volume = {2010}, journal = {Elektor Sonderheft, LEDs 2}, number = {2}, publisher = {Elektor-Verlag}, address = {Aachen}, pages = {40 -- 45}, year = {2010}, subject = {Wasseraufbereitung}, language = {de} } @article{BochtlerHellmannKaloudisetal.2010, author = {Bochtler, Ulrich and Hellmann, Ralf and Kaloudis, Michael and Amrhein, Frank and Glaab, Johannes and Kaloumenos, Mareiki and Sauer, Michael and Gockel, Tilo}, title = {LUVLED - UV-Leistungslichtquelle auf Leuchtdiodenbasis}, series = {Elektor Sonderheft, LEDs 2}, volume = {2011}, journal = {Elektor Sonderheft, LEDs 2}, number = {2}, publisher = {Elektor-Verlag}, address = {Aachen}, pages = {57 -- 63}, year = {2010}, subject = {Lumineszenzdiode}, language = {de} } @article{AmrheinBochtlerHellmannetal.2010, author = {Amrhein, Frank and Bochtler, Ulrich and Hellmann, Ralf and Kaloudis, Michael and Kaloumenos, Mareiki}, title = {Vergleich der thermischen Eigenschaften unterschiedlicher insulated metal substrat-Leiterplatten}, series = {PLUS, Leiterplattentechnik}, journal = {PLUS, Leiterplattentechnik}, number = {8}, publisher = {Hanser Verlag}, address = {M{\"u}nchen}, pages = {1758}, year = {2010}, subject = {Gedruckte Schaltung}, language = {de} } @article{HeilmannKowalskiHellmannetal.2013, author = {Heilmann, Eva-Maria and Kowalski, Thomas and Hellmann, Ralf and Teigelk{\"o}tter, Johannes}, title = {Water Jet Guided Laser Cutting of High Temperature Superconductors}, series = {Journal of Laser Micro/Nanoengineering}, volume = {8}, journal = {Journal of Laser Micro/Nanoengineering}, number = {1}, doi = {10.2961/jlmn.2013.01.0014}, pages = {70 -- 74}, year = {2013}, subject = {Laserschneiden}, language = {en} } @article{HellmannGockel2012, author = {Hellmann, Ralf and Gockel, Tilo}, title = {Optische Charakterisierung von Leuchtdioden}, series = {Zeitschrift ELEKTOR, Sonderheft LED-Special 4 - Leuchtdioden in Theorie und Praxis, 2012}, journal = {Zeitschrift ELEKTOR, Sonderheft LED-Special 4 - Leuchtdioden in Theorie und Praxis, 2012}, number = {9}, pages = {40 -- 46}, year = {2012}, subject = {Lumineszenzdiode}, language = {de} } @inproceedings{KalmarHellmannRegertetal.2012, author = {Kalm{\´a}r, L{\´a}szl{\´o} and Hellmann, Ralf and R{\´e}gert, Tam{\´a}s and Varga, Zoltan}, title = {Numerical investigation of unsteady heat transport procedure in high power LED module}, series = {GEP}, volume = {2012}, booktitle = {GEP}, number = {1}, pages = {43 -- 46}, year = {2012}, subject = {Lumineszenzdiode}, language = {en} } @article{SchneiderBochtlerHellmannetal.2012, author = {Schneider, Johannes and Bochtler, Ulrich and Hellmann, Ralf and Kaloudis, Michael and Gockel, Tilo}, title = {LUVLED III - Optimierung eines K{\"u}hlkonzeptes zur Aktivluftk{\"u}hlung eines Hochleistungs-UV-LED-Moduls}, series = {Zeitschrift ELEKTOR, Sonderheft LED-Special 4 - Leuchtdioden in Theorie und Praxis, 2012}, journal = {Zeitschrift ELEKTOR, Sonderheft LED-Special 4 - Leuchtdioden in Theorie und Praxis, 2012}, number = {9}, pages = {20 -- 29}, year = {2012}, subject = {Lumineszenzdiode}, language = {de} } @inproceedings{HuehnleinTschirpkeHellmann2010, author = {H{\"u}hnlein, Kristof and Tschirpke, Katrin and Hellmann, Ralf}, title = {Optimisation of laser cutting using design of experiment - A comparative study of cutting thin ceramic layers using a fibre laser and a CO2 laser}, series = {Physics procedia}, volume = {5}, booktitle = {Physics procedia}, number = {Part B}, issn = {1875-3892}, pages = {243 -- 252}, year = {2010}, subject = {Laserschneiden}, language = {en} } @article{RischHuehnleinKnoelletal.2010, author = {Risch, Anna and H{\"u}hnlein, Kristof and Kn{\"o}ll, J{\"u}rgen and Hellmann, Ralf}, title = {Picosecond and nanosecond pulsed laserscribing on transparent conductive indium tin oxide}, series = {Journal of Material processing technolgies}, journal = {Journal of Material processing technolgies}, issn = {0924-0136}, year = {2010}, subject = {Laserbearbeitung}, language = {en} } @article{BochtlerHellmannKaloudis2010, author = {Bochtler, Ulrich and Hellmann, Ralf and Kaloudis, Michael}, title = {Neuartige UV-Lichtquelle auf Leuchtdiodenbasis, Packaging und Hybridschaltungen}, series = {PLUS}, journal = {PLUS}, number = {2}, publisher = {Leuze-Verlag}, year = {2010}, subject = {Lumineszenzdiode}, language = {de} } @inproceedings{GlaabHellmann2010, author = {Glaab, Johannes and Hellmann, Ralf}, title = {Germicidal potential of ultraviolet-LED emitting different wavelength for the inactivation of indigenous coliform bacteria}, series = {Water research conference, Lissabon, Portugal}, booktitle = {Water research conference, Lissabon, Portugal}, year = {2010}, subject = {Lumineszenzdiode}, language = {en} } @inproceedings{RosenbergerBelleHellmann2009, author = {Rosenberger, Manuel and Belle, Stefan and Hellmann, Ralf}, title = {Optical interrogation of bragg grating sensors using tunable fibre based bandpass filter}, series = {Proceedings of the 20st international science conference, Mittweida}, booktitle = {Proceedings of the 20st international science conference, Mittweida}, year = {2009}, subject = {Bragg-Reflektor}, language = {en} }