{ "types" : { "Bookmark" : { "pluralLabel" : "Bookmarks" }, "Publication" : { "pluralLabel" : "Publications" }, "GoldStandardPublication" : { "pluralLabel" : "GoldStandardPublications" }, "GoldStandardBookmark" : { "pluralLabel" : "GoldStandardBookmarks" }, "Tag" : { "pluralLabel" : "Tags" }, "User" : { "pluralLabel" : "Users" }, "Group" : { "pluralLabel" : "Groups" }, "Sphere" : { "pluralLabel" : "Spheres" } }, "properties" : { "count" : { "valueType" : "number" }, "date" : { "valueType" : "date" }, "changeDate" : { "valueType" : "date" }, "url" : { "valueType" : "url" }, "id" : { "valueType" : "url" }, "tags" : { "valueType" : "item" }, "user" : { "valueType" : "item" } }, "items" : [ { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/263b0a187651854ff6e414a903ff2de7c/ifsw", "tags" : [ "myown","dlip","laser","peer","micromaterialprocessing","patterning" ], "intraHash" : "63b0a187651854ff6e414a903ff2de7c", "interHash" : "766d799edc2b4ff3c91ad6bed2b91148", "label" : "Spatial limit of two-beam interference patterning with ultrashort laser pulses", "user" : "ifsw", "description" : "", "date" : "2025-12-11 21:27:38", "changeDate" : "2025-12-15 21:12:07", "count" : 4, "pub-type": "article", "journal": "Optics Express","publisher":"Optica Publishing Group", "year": "2025", "url": "http://dx.doi.org/10.1364/OE.582373", "author": [ "Alexander Peter","Tobias Menold","Andreas Michalowski","Thomas Graf" ], "authors": [ {"first" : "Alexander", "last" : "Peter"}, {"first" : "Tobias", "last" : "Menold"}, {"first" : "Andreas", "last" : "Michalowski"}, {"first" : "Thomas", "last" : "Graf"} ], "volume": "33","number": "25","pages": "53420", "issn" : "1094-4087", "doi" : "10.1364/oe.582373", "bibtexKey": "Peter_2025" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2a4d27df88f75c2dc338defaf6bcbd5ae/ifsw", "tags" : [ "Drilling","myown","Scanner","Amplifier","Ablation","ThindiskLaser","MicroMaterialProcessing","from:manuelhenn","Laser","sys:relevant","UltrashortPulse" ], "intraHash" : "a4d27df88f75c2dc338defaf6bcbd5ae", "interHash" : "21162b03cf6472322cbaf69d4ba439cb", "label" : "Tribological system for cold sheet metal forming based on volatile lubricants\r\nand laser structured surfaces", "user" : "ifsw", "description" : "", "date" : "2022-03-22 18:13:35", "changeDate" : "2022-03-22 17:13:35", "count" : 3, "pub-type": "article", "journal": "Dry Metal Forming Open Access Journal", "year": "2020", "url": "https://www.trockenumformen.de/app/download/10606346/DMFOAJ_6_2020_128-165_Reichardt.pdf", "author": [ "Gerd Reichardt","Christoph Wörz","Markus Singer","Mathias Liewald","Manuel Henn","Daniel J. Förster","Ehsan Zahedi","Steffen Boley","Anne Feuer","Volkher Onuseit","Rudolf Weber","Thomas Graf","Georg Umlauf","Paul Reichle","Jakob Barz","Günter E. M. Tovar","Thomas Hirth" ], "authors": [ {"first" : "Gerd", "last" : "Reichardt"}, {"first" : "Christoph", "last" : "Wörz"}, {"first" : "Markus", "last" : "Singer"}, {"first" : "Mathias", "last" : "Liewald"}, {"first" : "Manuel", "last" : "Henn"}, {"first" : "Daniel J.", "last" : "Förster"}, {"first" : "Ehsan", "last" : "Zahedi"}, {"first" : "Steffen", "last" : "Boley"}, {"first" : "Anne", "last" : "Feuer"}, {"first" : "Volkher", "last" : "Onuseit"}, {"first" : "Rudolf", "last" : "Weber"}, {"first" : "Thomas", "last" : "Graf"}, {"first" : "Georg", "last" : "Umlauf"}, {"first" : "Paul", "last" : "Reichle"}, {"first" : "Jakob", "last" : "Barz"}, {"first" : "Günter E. M.", "last" : "Tovar"}, {"first" : "Thomas", "last" : "Hirth"} ], "volume": "6", "bibtexKey": "reichardttribological" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2181cb0ff310efc2e88eb08d15b3f9785/ifsw", "tags" : [ "Drilling","myown","Scanner","Amplifier","Ablation","ThindiskLaser","MicroMaterialProcessing","from:manuelhenn","peer","Laser","UltrashortPulse" ], "intraHash" : "181cb0ff310efc2e88eb08d15b3f9785", "interHash" : "78ad07832fad2affc1f1fd655898fe8c", "label" : "Friction and Wear Behavior of Deep Drawing Tools Using\r\nVolatile Lubricants Injected Through Laser-Drilled Micro-Holes", "user" : "ifsw", "description" : "", "date" : "2022-03-22 18:01:51", "changeDate" : "2022-03-22 17:01:51", "count" : 2, "pub-type": "article", "journal": "JOM", "year": "2021", "url": "http://dblp.uni-trier.de/db/journals/qre/qre30.html#SongMWZ14", "author": [ "Gerd Reichardt","Manuel Henn","Paul Reichle","Georg Umlauf","Kim Riedmüller","Rudolf Weber","Jakob Barz","Mathias Liewald","Thomas Graf","Günter Tovar" ], "authors": [ {"first" : "Gerd", "last" : "Reichardt"}, {"first" : "Manuel", "last" : "Henn"}, {"first" : "Paul", "last" : "Reichle"}, {"first" : "Georg", "last" : "Umlauf"}, {"first" : "Kim", "last" : "Riedmüller"}, {"first" : "Rudolf", "last" : "Weber"}, {"first" : "Jakob", "last" : "Barz"}, {"first" : "Mathias", "last" : "Liewald"}, {"first" : "Thomas", "last" : "Graf"}, {"first" : "Günter", "last" : "Tovar"} ], "volume": "74","number": "3","pages": "826-836","abstract": "In deep drawing processes, the use of lubricants is mandatory in order to\r\nprevent wear on tools and surface damage to the formed sheet metal components.\r\nHere, frequently used lubricants are synthetic and mineral oils,\r\nemulsions, and waxes. However, these conventional lubricants have to be\r\napplied to the sheet material prior to the forming operation and removed\r\nafterwards by cleaning processes. Additionally, the lubricants often contain\r\nsubstances that are harmful to the environment and to human health. To\r\ncounteract these economic and ecological disadvantages, research is currently\r\nbeing conducted on a novel tribological system. For this, volatile media such as\r\nliquid carbon dioxide and gaseous nitrogen are being used, and are introduced\r\ndirectly into the friction zones between the tool and the sheet metal material\r\nduring deep drawing under high pressure through special laser-drilled microholes.\r\nThis paper covers the latest investigations and findings regarding the\r\ndesign of flow-optimized micro-holes, the laser drilling process, the friction\r\ncharacterization on tool radii, and the tool wear to be expected when using the\r\nlubrication medium CO2.", "ee" : "http://dx.doi.org/10.1002/qre.1500", "language" : "english", "doi" : "https://doi.org/10.1007/s11837-021-05028-8", "bibtexKey": "Reichardt.2014.Friction" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/26a3fd12e7c8e11c15501269b170a2747/ifsw", "tags" : [ "steel","myown","modeling","laser","micromaterialprocessing","ultrashortpulse","from:annefeuer","drilling" ], "intraHash" : "6a3fd12e7c8e11c15501269b170a2747", "interHash" : "a08ac59aa54c2255a5516691af9ec8bd", "label" : "Quality Aspects in Percussion Drilling with Ultrashort Laser Pulses", "user" : "ifsw", "description" : "Invited talk", "date" : "2021-09-13 12:57:55", "changeDate" : "2021-09-13 10:57:55", "count" : 2, "pub-type": "presentation", "year": "2021", "url": "", "author": [ "Anne Feuer","Rudolf Weber","David Brinkmeier","Thomas Graf" ], "authors": [ {"first" : "Anne", "last" : "Feuer"}, {"first" : "Rudolf", "last" : "Weber"}, {"first" : "David", "last" : "Brinkmeier"}, {"first" : "Thomas", "last" : "Graf"} ], "editor": [ "Anne Feuer" ], "editors": [ {"first" : "Anne", "last" : "Feuer"} ], "abstract": "Percussion drilling with ultrashort laser pulses is often associated with a poor quality of the exit of the microholes. Therefore, complex drilling methods such as helical drilling must often be used to achieve high-quality holes. However, it is not yet fully clarified why helical drilling produces significantly better results in terms of microhole exit than percussion drilling. Therefore, the emergence and change of quality of the exit of percussion-drilled holes during the drilling process was studied in detail. For the quantitative analysis of the quality of the microhole exit, microscope images were evaluated using a machine learning approach. By comparing theoretical and experimental results, it was possible to derive conditions under which high-quality exits can be produced with simple percussion drilling. The fluence at the exit of the microholes during the drilling process was found as a decisive influencing variable defining the quality of the microhole exit. In the current talk, the experimental and theoretical investigations are presented, whereby the focus will be on the influence of laser fluence on the edge quality of percussion-drilled microholes. It will be shown that the quality of the exits of percussion-drilled microholes can be significantly improved if the fluence dependence is correctly considered.", "venue" : "virtual", "language" : "English", "eventdate" : "October 18-20th, 2021", "eventtitle" : "ICALEO 2021", "bibtexKey": "feuer.2021.quality" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2a5c12b656ab54bc6fe70dc9815fafa39/ifsw", "tags" : [ "MicroMaterialProcessing","Drilling","myown","Laser","UltrashortPulse","from:annefeuer","Steel" ], "intraHash" : "a5c12b656ab54bc6fe70dc9815fafa39", "interHash" : "43e757b2ef681e2a1eb0c7fcd432512f", "label" : "Depth and quality limit for percussion-drilled microholes with depth > 1 mm using ultrashort pulsed laser radiation", "user" : "ifsw", "description" : "", "date" : "2021-09-13 12:29:05", "changeDate" : "2021-09-13 10:29:05", "count" : 3, "pub-type": "inproceedings", "booktitle": "Proceedings of the Lasers in Manufacturing Conference 2019","publisher":"German Scientific Laser Society (WLT e.V.)", "year": "2019", "url": "https://www.wlt.de/lim/Proceedings2019/data/PDF/Contribution_349_final.pdf", "author": [ "Anne Feuer","Daniel J. Förster","Rudolf Weber","Thomas Graf" ], "authors": [ {"first" : "Anne", "last" : "Feuer"}, {"first" : "Daniel J.", "last" : "Förster"}, {"first" : "Rudolf", "last" : "Weber"}, {"first" : "Thomas", "last" : "Graf"} ], "abstract": "Based on the assumption that laser-drilled microholes can be approximated by a cone the maximum depth as a function of the laser fluence can be predicted by a simple analytical model. In this contribution, it will be shown, that the calculated maximum depth agrees well to microholes in stainless steel with drilling depth > 1mm. A Ti: sapphire laser at a wavelength of 800 nm and a pulse duration of 1 ps was used to percussion drill microholes with pulse energies up to 5 mJ and the corresponding maximum drilling depth was determined. Due to the low repetition rate of 1 kHz heat accumulation effects could be excluded. Furthermore, the quality of the microhole exit was investigated as a function of the peak fluence in 1 mm stainless steel, including the formation of side channels and the development of the shape of the microhole exit.", "eventtitle" : "Lasers in Manufacturing Conference 2019", "venue" : "Munich, Germany", "eventdate" : "June 2019", "bibtexKey": "feuer.2019.depth" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2d2013e1ae78b414d18487dc317dc4d2c/ifsw", "tags" : [ "steel","myown","modeling","laser","micromaterialprocessing","ultrashortpulse","from:annefeuer","drilling" ], "intraHash" : "d2013e1ae78b414d18487dc317dc4d2c", "interHash" : "cfe881de56302af14cf6566da62f9c03", "label" : "Fluence dependence of the edge quality of microhole exits for percussion drilling with ultrashort laser pulses", "user" : "ifsw", "description" : "", "date" : "2021-09-13 11:38:47", "changeDate" : "2021-09-13 09:38:47", "count" : 2, "pub-type": "inproceedings", "booktitle": "Proceedings of the Lasers in Manufacturing Conference 2021","publisher":"WLT e.V.", "year": "2021", "url": "", "author": [ "Anne Feuer","Rudolf Weber","Thomas Graf" ], "authors": [ {"first" : "Anne", "last" : "Feuer"}, {"first" : "Rudolf", "last" : "Weber"}, {"first" : "Thomas", "last" : "Graf"} ], "editor": [ "Anne Feuer" ], "editors": [ {"first" : "Anne", "last" : "Feuer"} ], "abstract": "For many applications, edge quality and shape accuracy of microholes are crucial. One assumption is that the fluence at the tip of the microhole during drilling is a key parameter for the quality of the microhole\u2019s exit. It was therefore investigated experimentally how the fluence affects the edge quality. The experiments were performed in 0.5 mm thick steel using a Ti: sapphire laser system operating at a wavelength of 800 nm, a pulse duration of 1 ps, and a repetition rate of 1 kHz. For the quantitative analysis of the edge quality, microscope images were evaluated using a machine learning approach. Two key figures, striations amplitude and perimeter ratio, were defined that proved to be significant in characterizing the edge quality of exits. In the current talk it will be shown that the quality of exits of percussion-drilled microholes could be significantly improved if the fluence dependence is considered.", "language" : "English", "eventdate" : "June 21 - 24, 2021", "eventtitle" : "Lasers in Manufacturing Conference 2021 (LiM)", "bibtexKey": "feuer2021fluence" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/261cdb9c772f761119a637c1c5c3103b0/ifsw", "tags" : [ "steel","myown","modeling","laser","micromaterialprocessing","ultrashortpulse","from:annefeuer","drilling" ], "intraHash" : "61cdb9c772f761119a637c1c5c3103b0", "interHash" : "4c695c21806aec1e9dd2f140a1a6ec07", "label" : "High\u2011quality percussion drilling with ultrashort laser pulses", "user" : "ifsw", "description" : "", "date" : "2021-09-13 11:14:12", "changeDate" : "2021-09-13 09:14:12", "count" : 4, "pub-type": "article", "journal": "Appl Phys A (Applied Physics A)", "year": "2021", "url": "https://rdcu.be/ctXIe", "author": [ "Anne Feuer","Rudolf Weber","Ronny Feuer","David Brinkmeier","Thomas Graf" ], "authors": [ {"first" : "Anne", "last" : "Feuer"}, {"first" : "Rudolf", "last" : "Weber"}, {"first" : "Ronny", "last" : "Feuer"}, {"first" : "David", "last" : "Brinkmeier"}, {"first" : "Thomas", "last" : "Graf"} ], "editor": [ "Anne Feuer" ], "editors": [ {"first" : "Anne", "last" : "Feuer"} ], "volume": "127:665","number": "9","pages": "1-9","abstract": "The influence of the laser fluence on the quality of percussion-drilled holes was investigated both experimentally and by an analytical model. The study reveals that the edge quality of the drilled microholes depends on the laser fluence reaching the rear exit of the hole and changes with the number of pulses applied after breakthrough. The minimum fluence that must reach the hole\u2019s exit in order to obtain high-quality microholes in stainless steel was experimentally found to be 2.8 times the ablation threshold.", "language" : "English", "doi" : "https://doi.org/10.1007/s00339-021-04818-w", "bibtexKey": "feuer.2021.highquality" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2ddd7b0bd69bcd8e8b9092dd00801cfaf/ifsw", "tags" : [ "MicroMaterialProcessing","Drilling","myown","Laser","from:annefeuer","Steel" ], "intraHash" : "ddd7b0bd69bcd8e8b9092dd00801cfaf", "interHash" : "43e757b2ef681e2a1eb0c7fcd432512f", "label" : "Depth and quality limit for percussion-drilled microholes with depth > 1 mm using ultrashort pulsed laser radiation", "user" : "ifsw", "description" : "", "date" : "2021-06-09 10:00:24", "changeDate" : "2021-06-09 08:00:24", "count" : 3, "pub-type": "inproceedings", "booktitle": "Lasers in Manufacturing Conference 2019","publisher":"German Scientific Laser Society (WLT e.V.)", "year": "2019", "url": "https://www.wlt.de/lim/Proceedings2019/data/PDF/Contribution_349_final.pdf", "author": [ "Anne Feuer","Daniel J. Förster","Rudolf Weber","Thomas Graf" ], "authors": [ {"first" : "Anne", "last" : "Feuer"}, {"first" : "Daniel J.", "last" : "Förster"}, {"first" : "Rudolf", "last" : "Weber"}, {"first" : "Thomas", "last" : "Graf"} ], "abstract": "Based on the assumption that laser-drilled microholes can be approximated by a cone the maximum depth as a function of the laser fluence can be predicted by a simple analytical model. In this contribution, it will be shown, that the calculated maximum depth agrees well to microholes in stainless steel with drilling depth > 1mm. A Ti: sapphire laser at a wavelength of 800 nm and a pulse duration of 1 ps was used to percussion drill microholes with pulse energies up to 5 mJ and the corresponding maximum drilling depth was determined. Due to the low repetition rate of 1 kHz heat accumulation effects could be excluded. Furthermore, the quality of the microhole exit was investigated as a function of the peak fluence in 1 mm stainless steel, including the formation of side channels and the development of the shape of the microhole exit.", "venue" : "Munich, Germany", "eventdate" : "June 2019", "eventtitle" : "Lasers in Manufacturing Conference 2019", "bibtexKey": "feuer.2019.depth" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/27e13cdbedf9ca093a254ca61c43d473e/ifsw", "tags" : [ "MicroMaterialProcessing","Drilling","myown","Laser","UltrashortPulse","from:annefeuer","Steel" ], "intraHash" : "7e13cdbedf9ca093a254ca61c43d473e", "interHash" : "bd30ce0c642f9ee35fcdddbadbc41147", "label" : "Influence of laser parameters on quality of microholes and process efficiency", "user" : "ifsw", "description" : "", "date" : "2021-06-09 09:10:02", "changeDate" : "2021-06-09 07:10:02", "count" : 4, "pub-type": "inproceedings", "booktitle": "Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XIX","series": "Proc. SPIE", "year": "2014", "url": "https://doi.org/10.1117/12.2037674", "author": [ "Anne Feuer","Christoph Kunz","Martin Kraus","Volkher Onuseit","Rudolf Weber","Thomas Graf","Denis Ingildeev","Frank Hermanutz" ], "authors": [ {"first" : "Anne", "last" : "Feuer"}, {"first" : "Christoph", "last" : "Kunz"}, {"first" : "Martin", "last" : "Kraus"}, {"first" : "Volkher", "last" : "Onuseit"}, {"first" : "Rudolf", "last" : "Weber"}, {"first" : "Thomas", "last" : "Graf"}, {"first" : "Denis", "last" : "Ingildeev"}, {"first" : "Frank", "last" : "Hermanutz"} ], "volume": "89670H","abstract": "To enable the direct-spinning process of super-micro fibres (< 0.5 dtex) suitable for novel medical, hygienical and technical products microhole arrays with diameters down to 25 μm in very high quality are required. Using ultrashort pulses together with a helical drilling optics microholes with high accuracy were manufactured in metals of a thickness in the range of 0.3 mm. However, the required process time for a single microhole ranges up to several ten seconds. Simple energy balance considerations show that higher averaged powers - either achieved with larger pulse energies or\r\nan increased repetition rate - considerable reduce the process time. In this case plasma formation and heat accumulation\r\nshow an increased formation of melt and recast. Thus, the objective is to increase the productivity while maintaining consistent quality of the microholes.\r\nWith this aim, the influence of pulse energy and repetition rate on the borehole geometry, processing quality and process efficiency was investigated for helical drilling. In the present research work a TruMicro 5250 laser source (tp = 8 ps, λ=515 nm, fR=800 kHz) was used. To determine the process time of the microhole the transmitted laser radiation was recorded. A systematic evaluation of the process quality and process time dependent on pulse energy and repetition rate will be presented in this contribution. First laser manufactured spinning nozzles with microhole diameters down to 25 μm processed in 0.24 mm thick AuPt alloy were used to fabricate unique super-micro fibres with yarn counts down to 0.2 dtex.", "venue" : "San Francisco, California, United States", "language" : "English", "eventdate" : "1-6 February 2014", "eventtitle" : "SPIE LASE, Photonics West", "doi" : "10.1117/12.2037674", "bibtexKey": "Feuer.2014.Influence" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/269c699bdd897052017fb9ba365d569b3/ifsw", "tags" : [ "MicroMaterialProcessing","Drilling","myown","Laser","UltrashortPulse","from:annefeuer","Steel" ], "intraHash" : "69c699bdd897052017fb9ba365d569b3", "interHash" : "bd30ce0c642f9ee35fcdddbadbc41147", "label" : "Influence of laser parameters on quality of microholes and process efficiency", "user" : "ifsw", "description" : "", "date" : "2021-06-09 09:06:34", "changeDate" : "2021-06-09 07:06:34", "count" : 4, "pub-type": "inproceedings", "journal": "Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XIX", "year": "2014", "url": "", "author": [ "Anne Feuer","Christoph Kunz","Martin Kraus","Volkher Onuseit","Rudolf Weber","Thomas Graf","Denis Ingildeev","Frank Hermanutz" ], "authors": [ {"first" : "Anne", "last" : "Feuer"}, {"first" : "Christoph", "last" : "Kunz"}, {"first" : "Martin", "last" : "Kraus"}, {"first" : "Volkher", "last" : "Onuseit"}, {"first" : "Rudolf", "last" : "Weber"}, {"first" : "Thomas", "last" : "Graf"}, {"first" : "Denis", "last" : "Ingildeev"}, {"first" : "Frank", "last" : "Hermanutz"} ], "volume": "89670H","abstract": "To enable the direct-spinning process of super-micro fibres (< 0.5 dtex) suitable for novel medical, hygienical and technical products microhole arrays with diameters down to 25 μm in very high quality are required. Using ultrashort pulses together with a helical drilling optics microholes with high accuracy were manufactured in metals of a thickness in the range of 0.3 mm. However, the required process time for a single microhole ranges up to several ten seconds. Simple energy balance considerations show that higher averaged powers - either achieved with larger pulse energies or\r\nan increased repetition rate - considerable reduce the process time. In this case plasma formation and heat accumulation\r\nshow an increased formation of melt and recast. Thus, the objective is to increase the productivity while maintaining consistent quality of the microholes.\r\nWith this aim, the influence of pulse energy and repetition rate on the borehole geometry, processing quality and process efficiency was investigated for helical drilling. In the present research work a TruMicro 5250 laser source (tp = 8 ps, λ=515 nm, fR=800 kHz) was used. To determine the process time of the microhole the transmitted laser radiation was recorded. A systematic evaluation of the process quality and process time dependent on pulse energy and repetition rate will be presented in this contribution. First laser manufactured spinning nozzles with microhole diameters down to 25 μm processed in 0.24 mm thick AuPt alloy were used to fabricate unique super-micro fibres with yarn counts down to 0.2 dtex.", "venue" : "San Francisco, California, United States", "language" : "English", "eventdate" : "1-6 February 2014", "eventtitle" : "SPIE LASE", "doi" : "https://doi.org/10.1117/12.2037674", "bibtexKey": "Feuer.2014.Influence" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/29c72faabca8233641a6c21d14ecac63a/ifsw", "tags" : [ "MicroMaterialProcessing","Drilling","myown","Laser","UltrashortPulse","from:annefeuer","Steel" ], "intraHash" : "9c72faabca8233641a6c21d14ecac63a", "interHash" : "bd30ce0c642f9ee35fcdddbadbc41147", "label" : "Influence of laser parameters on quality of microholes and process efficiency", "user" : "ifsw", "description" : "", "date" : "2021-06-09 08:59:03", "changeDate" : "2021-06-09 06:59:03", "count" : 4, "pub-type": "proceedings", "journal": "Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XIX", "year": "2014", "url": "", "author": [ "Anne Feuer","Christoph Kunz","Martin Kraus","Volkher Onuseit","Rudolf Weber","Thomas Graf","Denis Ingildeev","Frank Hermanutz" ], "authors": [ {"first" : "Anne", "last" : "Feuer"}, {"first" : "Christoph", "last" : "Kunz"}, {"first" : "Martin", "last" : "Kraus"}, {"first" : "Volkher", "last" : "Onuseit"}, {"first" : "Rudolf", "last" : "Weber"}, {"first" : "Thomas", "last" : "Graf"}, {"first" : "Denis", "last" : "Ingildeev"}, {"first" : "Frank", "last" : "Hermanutz"} ], "volume": "89670H","abstract": "To enable the direct-spinning process of super-micro fibres (< 0.5 dtex) suitable for novel medical, hygienical and technical products microhole arrays with diameters down to 25 μm in very high quality are required. Using ultrashort pulses together with a helical drilling optics microholes with high accuracy were manufactured in metals of a thickness in the range of 0.3 mm. However, the required process time for a single microhole ranges up to several ten seconds. Simple energy balance considerations show that higher averaged powers - either achieved with larger pulse energies or\r\nan increased repetition rate - considerable reduce the process time. In this case plasma formation and heat accumulation\r\nshow an increased formation of melt and recast. Thus, the objective is to increase the productivity while maintaining consistent quality of the microholes.\r\nWith this aim, the influence of pulse energy and repetition rate on the borehole geometry, processing quality and process efficiency was investigated for helical drilling. In the present research work a TruMicro 5250 laser source (tp = 8 ps, λ=515 nm, fR=800 kHz) was used. To determine the process time of the microhole the transmitted laser radiation was recorded. A systematic evaluation of the process quality and process time dependent on pulse energy and repetition rate will be presented in this contribution. First laser manufactured spinning nozzles with microhole diameters down to 25 μm processed in 0.24 mm thick AuPt alloy were used to fabricate unique super-micro fibres with yarn counts down to 0.2 dtex.", "venue" : "San Francisco, California, United States", "language" : "English", "eventdate" : "1-6 February 2014", "eventtitle" : "SPIE LASE", "doi" : "https://doi.org/10.1117/12.2037674", "bibtexKey": "Feuer.2014.Influence" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/24aa478ad00cf77f314c8f33dbde6b860/ifsw", "tags" : [ "MicroMaterialProcessing","Neugebauer,C.","Trumpf_GmbH_&_Co.KG","Faas,Sebastian","Laser","from:julianholland","Ablation","Masterarbeit" ], "intraHash" : "4aa478ad00cf77f314c8f33dbde6b860", "interHash" : "8d342647a107e2cd863641b19ac310ec", "label" : "Untersuchung der Abtragmechnismen von polymerbeschichtetem Metall am Beispiel von isolierten Kupferleitern in Hochleistungsmotoren", "user" : "ifsw", "description" : "", "date" : "2020-09-22 17:58:36", "changeDate" : "2020-09-22 15:58:36", "count" : 3, "pub-type": "article", "year": "2018", "url": "", "author": [ "R. Groß" ], "authors": [ {"first" : "R.", "last" : "Groß"} ], "number": "IFSW18-10", "bibtexKey": "Groß.2018.Untersuchung" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2e6a560671328e686b92996a638279c61/ifsw", "tags" : [ "MicroMaterialProcessing","Trumpf_GmbH_&_Co.KG","Freitag,Christian","Zimmermann,F.","Laser","from:julianholland","Masterarbeit","HeatAccumulation" ], "intraHash" : "e6a560671328e686b92996a638279c61", "interHash" : "f39024938a69cb175190dabcf9d4d37f", "label" : "UKP-induzierte Wärmeakkumulationseffekte in transparenten Materialien zum lokalen Laserschweißen", "user" : "ifsw", "description" : "", "date" : "2020-09-22 17:58:02", "changeDate" : "2020-09-22 15:58:02", "count" : 2, "pub-type": "mastersthesis", "year": "2018", "url": "", "author": [ "A. Gruber" ], "authors": [ {"first" : "A.", "last" : "Gruber"} ], "number": "IFSW18-09", "bibtexKey": "Gruber.2018.UKP-induzierte" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/277796b0c9777ab59b43bf77f3a90e237/ifsw", "tags" : [ "MicroMaterialProcessing","Robert_Bosch_GmbH","Faas,Sebastian","Laser","from:julianholland","Ablation","Masterarbeit","Gauch,Roland" ], "intraHash" : "77796b0c9777ab59b43bf77f3a90e237", "interHash" : "9389eba28382f71ffce50a3c5d449685", "label" : "Abtrag von Isolationslack von Kupfer mit 10,6µm Laserstrahlung", "user" : "ifsw", "description" : "", "date" : "2020-09-22 17:43:56", "changeDate" : "2020-09-22 15:43:56", "count" : 2, "pub-type": "mastersthesis", "year": "2018", "url": "", "author": [ "M. Grafried" ], "authors": [ {"first" : "M.", "last" : "Grafried"} ], "number": "IFSW18-02", "bibtexKey": "Grafried.2018.Abtrag" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/22c3f6f5849246ed2572a5f6ef2ac2803/ifsw", "tags" : [ "from:alexanderpeter","myown","laser","micromaterialprocessing","beamshaping" ], "intraHash" : "2c3f6f5849246ed2572a5f6ef2ac2803", "interHash" : "47883251c01eb299fff8ea03d7195374", "label" : "Flexible, compact and picosecond laser capable four-beam interference setup", "user" : "ifsw", "description" : "", "date" : "2020-09-11 12:02:08", "changeDate" : "2024-05-14 16:17:34", "count" : 3, "pub-type": "inproceedings", "publisher":"Proceedings of the Lasers in Manufacturing Conference", "year": "2017", "url": "", "author": [ "Alexander Peter","Volkher Onuseit","Christian Freitag","Sebastian Faas","Thomas Graf" ], "authors": [ {"first" : "Alexander", "last" : "Peter"}, {"first" : "Volkher", "last" : "Onuseit"}, {"first" : "Christian", "last" : "Freitag"}, {"first" : "Sebastian", "last" : "Faas"}, {"first" : "Thomas", "last" : "Graf"} ], "abstract": "Periodic micro structures on surfaces offer unique properties, such as hydrophobic behavior, holographic light reflection or friction and wear minimization. Multi-beam interference patterning is a technology to produce micro structures from several micrometers down to below 1 µm, dependent on the wavelength and angle between the interfering beams. A high power capable four-beam interference setup, designed for infrared ultrashort pulsed laser sources in the picosecond regime will be shown. The setup provides independent variation of the period, intensity distribution and pattern size of the interference pattern. The period is variable from 1 µm with a working distance of 100 mm up to 5 µm with a working distance of about 800 mm. The intensity distribution can be modified to different shapes, such as lines, holes, ripples etc. by controlling the polarization of each beam separately. The fluence of the pattern is controllable by changing the pattern size. To change the pattern size, the beam diameter can be varied by a telescope with variable focal length. The setup is built in a stable design of a size of about 300x300x300 mm³ and a weight of 4.6 kg. To avoid aberrations at high laser power, especially focus shift, the setup was designed with high reflective mirrors. An experimental verification shows the comparison between the experimental results and the calculated design and features.", "bibtexKey": "Peter.2017.Flexible" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/24421293d6ccb6e409267fe03fa5eee7c/ifsw", "tags" : [ "MicroMaterialProcessing","from:alexanderpeter","myown","Laser","BeamShaping","UltrashortPulse" ], "intraHash" : "4421293d6ccb6e409267fe03fa5eee7c", "interHash" : "61677fd5f47bb8487d9b4b64e6ec907b", "label" : "Direct Laser Interference Patterning of antibacterial surfaces on stainless steel by means of ultrafast laser", "user" : "ifsw", "description" : "", "date" : "2020-09-11 11:55:57", "changeDate" : "2024-05-14 16:17:46", "count" : 2, "pub-type": "inproceedings", "publisher":"Proceedings of the Lasers in Manufacturing Conference", "year": "2019", "url": "", "author": [ "Alexander Peter","Adrian H A Lutey","Sebastian Faas","Luca Romoli","Onuseit Onuseit","Thomas Graf" ], "authors": [ {"first" : "Alexander", "last" : "Peter"}, {"first" : "Adrian H A", "last" : "Lutey"}, {"first" : "Sebastian", "last" : "Faas"}, {"first" : "Luca", "last" : "Romoli"}, {"first" : "Onuseit", "last" : "Onuseit"}, {"first" : "Thomas", "last" : "Graf"} ], "abstract": "Direct Laser Interference Patterning (DLIP) is a laser processing method that provides a tool for creating a wide field of functional surfaces. In the present work, the generation of antibacterial surfaces on stainless steel is shown with a high power capable DLIP setup. The used laser was an ultrafast laser with a wavelength of 1030nm and a pulse duration of eight picoseconds. Two different topographies were produced, which were generated with two different polarization orientation of the laser. Both topographies were investigated in their antibacterial behavior. The employed method for assessing the bacterial retention is based on ISO standards for measurement of antibacterial performance. The resulting topographies shows a retention of up to 99,8% for E. Coli and up to 79.1% for S. aureus bacteria.", "bibtexKey": "Peter.2019.Direct" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/257bbdea159119488a688d219a0979838/ifsw", "tags" : [ "MicroMaterialProcessing","Laser","Structuring","from:peterberger" ], "intraHash" : "57bbdea159119488a688d219a0979838", "interHash" : "a30335a393d170051dd2cce5d6946791", "label" : "Surface structuring with a 500 W picosecond laser", "user" : "ifsw", "description" : "", "date" : "2020-01-13 00:12:58", "changeDate" : "2020-01-12 23:12:58", "count" : 2, "pub-type": "inproceedings", "booktitle": "Lasers in Manufacturing 2017", "year": "2017", "url": "", "author": [ "Sebastian Faas","C. Sciancalepore","Rudolf Weber","L. Romoli","Thomas Graf" ], "authors": [ {"first" : "Sebastian", "last" : "Faas"}, {"first" : "C.", "last" : "Sciancalepore"}, {"first" : "Rudolf", "last" : "Weber"}, {"first" : "L.", "last" : "Romoli"}, {"first" : "Thomas", "last" : "Graf"} ], "venue" : "Munich, Germany", "eventtitle" : "Lasers in Manufacturing Conference (LiM)", "eventdate" : "June 26 - 29, 2017", "bibtexKey": "Faas.2017.Surface" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2443af86ba4fdb0f38611efbf36340e1b/ifsw", "tags" : [ "MicroMaterialProcessing","Drilling","Welding","Laser","MacroMaterialProcessing","Ablation","Cutting","from:peterberger" ], "intraHash" : "443af86ba4fdb0f38611efbf36340e1b", "interHash" : "953cd9c19c7b0e66f602833dcb4474b0", "label" : "Kilowatt Average Power Short-Pulse Laser Processing of CFRP - Quality Challenges", "user" : "ifsw", "description" : "", "date" : "2020-01-13 00:12:58", "changeDate" : "2020-01-12 23:12:58", "count" : 3, "pub-type": "inproceedings", "booktitle": "Lasers in Manufacturing 2015", "year": "2015", "url": "", "author": [ "Rudolf Weber","Christian Freitag","Margit Wiedenmann","Volkher Onuseit","Thomas Graf" ], "authors": [ {"first" : "Rudolf", "last" : "Weber"}, {"first" : "Christian", "last" : "Freitag"}, {"first" : "Margit", "last" : "Wiedenmann"}, {"first" : "Volkher", "last" : "Onuseit"}, {"first" : "Thomas", "last" : "Graf"} ], "venue" : "Munich, Germany", "eventtitle" : "Lasers in Manufacturing Conference (LiM)", "eventdate" : "June 22 - 25, 2015", "bibtexKey": "Weber.2016.Kilowatt" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/231707b040da84ac2bc8f2578bb8d66b2/ifsw", "tags" : [ "MicroMaterialProcessing","Laser","EnergyCoupling","from:peterberger" ], "intraHash" : "31707b040da84ac2bc8f2578bb8d66b2", "interHash" : "4dcc75e952b92badf30540951e5bcc46", "label" : "Ansätze zur Steigerung der Prozesseffizienz beim Trennen von CFK mit Mehrfachüberfahrten", "user" : "ifsw", "description" : "", "date" : "2020-01-13 00:12:58", "changeDate" : "2020-01-12 23:12:58", "count" : 2, "pub-type": "inproceedings", "booktitle": "Lasers in Manufacturing 2015", "year": "2015", "url": "", "author": [ "Christian Freitag","S. Mader","Margit Wiedenmann","Volkher Onuseit","Rudolf Weber","Thomas Graf" ], "authors": [ {"first" : "Christian", "last" : "Freitag"}, {"first" : "S.", "last" : "Mader"}, {"first" : "Margit", "last" : "Wiedenmann"}, {"first" : "Volkher", "last" : "Onuseit"}, {"first" : "Rudolf", "last" : "Weber"}, {"first" : "Thomas", "last" : "Graf"} ], "venue" : "Munich, Germany", "eventtitle" : "Lasers in Manufacturing Conference (LiM)", "eventdate" : "June 22 - 25, 2015", "bibtexKey": "Freitag.2016.Ansätze" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2314f5925ddfabc73761b256f450d2262/ifsw", "tags" : [ "MicroMaterialProcessing","Welding","Laser","from:peterberger" ], "intraHash" : "314f5925ddfabc73761b256f450d2262", "interHash" : "07ccbd1f7e86911ef930b8f364e890a4", "label" : "Remote laser welding of multi-alloy aluminum at close-edge position", "user" : "ifsw", "description" : "", "date" : "2020-01-13 00:12:58", "changeDate" : "2020-01-12 23:12:58", "count" : 2, "pub-type": "inproceedings", "journal": "Phsics Procedia","booktitle": "Lasers in Manufacturing 2013","publisher":"Elsevier Ltd.","address":"Amsterdam", "year": "2013", "url": "", "author": [ "Daniel Weller","Cyrille Bezençon","Peter Stritt","Rudolf Weber","Thomas Graf" ], "authors": [ {"first" : "Daniel", "last" : "Weller"}, {"first" : "Cyrille", "last" : "Bezençon"}, {"first" : "Peter", "last" : "Stritt"}, {"first" : "Rudolf", "last" : "Weber"}, {"first" : "Thomas", "last" : "Graf"} ], "volume": "41", "venue" : "Munich, Germany", "isbn" : "9781627487573", "eventdate" : "May 13 - 16, 2013", "eventtitle" : "Seventh International WLT Conference on Lasers in Manufacturing (LiM)", "bibtexKey": "Weller.2013.Remote" } ] }