@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} }