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         "type" : "Publication",
         "id"   : "https://puma.ub.uni-stuttgart.de/bibtex/2458ade3457d8f95c50d01b418e257285/manuelhenn",         
         "tags" : [
            "ablation","diagnostics","drilling","micromaterialprocessing","myown","nondestructive","processmonitoring","pulse","stainlesssteel","ultrashort","x-ray"
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         "intraHash" : "458ade3457d8f95c50d01b418e257285",
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         "label" : "High Speed X-Ray Imaging of Laser Percussion Drilling with Ultrashort Laser Pulses",
         "user" : "manuelhenn",
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         "date" : "2025-07-07 19:36:07",
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         "year": "2024", 
         "url": "", 
         
         "author": [ 
            "Manuel Henn","Lukas Schneller","Matthias Buser","Christian Hagenlocher","Christoph Spurk","Marc Hummel","Felix Beckmann","Julian Moosmann","Thomas Graf"
         ],
         "authors": [
         	
            	{"first" : "Manuel",	"last" : "Henn"},
            	{"first" : "Lukas",	"last" : "Schneller"},
            	{"first" : "Matthias",	"last" : "Buser"},
            	{"first" : "Christian",	"last" : "Hagenlocher"},
            	{"first" : "Christoph",	"last" : "Spurk"},
            	{"first" : "Marc",	"last" : "Hummel"},
            	{"first" : "Felix",	"last" : "Beckmann"},
            	{"first" : "Julian",	"last" : "Moosmann"},
            	{"first" : "Thomas",	"last" : "Graf"}
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         "abstract": "Percussion drilling of metals with ultrashort pulses has been extensively studied, yet understanding irregularities and defects such as irregular hole shapes, bending, and the formation of side channels remains challenging due to limitations in conventional diagnostics. A study was conducted at the DESY (Deutsches Elektronen\u2010Synchrotron, Hamburg, Germany), in which high-speed synchrotron X ray imaging was used to observe the dynamic shape changes during laser drilling of metals, bridging the gaps left by previous diagnostic techniques. The experimental setup involved an ultrafast YB:YAG laser focused on a sample made from stainless-steel. The X-ray beam enabled the capturing of the formation of a microhole during the drilling process, providing valuable insights into the microhole formation and associated defects. The X-ray image sequences were post-processed using a flat field correction and a Kalman filter to enhance the image quality. In this talk, we delve into the formation of side channels and bulges during the drilling process. In addition, we show the effects of the polarization states of the processing laser on the formation of side channels.",
         "venue" : "SLT 2024",
         
         "eventdate" : "04 - 06 June 2024",
         
         "bibtexKey": "Henn.2024.xray.drilling"

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         "id"   : "https://puma.ub.uni-stuttgart.de/bibtex/2458ade3457d8f95c50d01b418e257285/ifsw",         
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         "label" : "High Speed X-Ray Imaging of Laser Percussion Drilling with Ultrashort Laser Pulses",
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         "author": [ 
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            	{"first" : "Manuel",	"last" : "Henn"},
            	{"first" : "Lukas",	"last" : "Schneller"},
            	{"first" : "Matthias",	"last" : "Buser"},
            	{"first" : "Christian",	"last" : "Hagenlocher"},
            	{"first" : "Christoph",	"last" : "Spurk"},
            	{"first" : "Marc",	"last" : "Hummel"},
            	{"first" : "Felix",	"last" : "Beckmann"},
            	{"first" : "Julian",	"last" : "Moosmann"},
            	{"first" : "Thomas",	"last" : "Graf"}
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         "abstract": "Percussion drilling of metals with ultrashort pulses has been extensively studied, yet understanding irregularities and defects such as irregular hole shapes, bending, and the formation of side channels remains challenging due to limitations in conventional diagnostics. A study was conducted at the DESY (Deutsches Elektronen\u2010Synchrotron, Hamburg, Germany), in which high-speed synchrotron X ray imaging was used to observe the dynamic shape changes during laser drilling of metals, bridging the gaps left by previous diagnostic techniques. The experimental setup involved an ultrafast YB:YAG laser focused on a sample made from stainless-steel. The X-ray beam enabled the capturing of the formation of a microhole during the drilling process, providing valuable insights into the microhole formation and associated defects. The X-ray image sequences were post-processed using a flat field correction and a Kalman filter to enhance the image quality. In this talk, we delve into the formation of side channels and bulges during the drilling process. In addition, we show the effects of the polarization states of the processing laser on the formation of side channels.",
         "venue" : "SLT 2024",
         
         "eventdate" : "04 - 06 June 2024",
         
         "bibtexKey": "Henn.2024.xray.drilling"

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         "type" : "Publication",
         "id"   : "https://puma.ub.uni-stuttgart.de/bibtex/263218596dc109b8323e4d89fb7dd5d2b/dtraunecker",         
         "tags" : [
            "diagnostics","myown","processmonitoring","pyrometer"
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         "intraHash" : "63218596dc109b8323e4d89fb7dd5d2b",
         "interHash" : "876cfacf201b8442b155a5876a058c31",
         "label" : "Improving pyrometric temperature measurements for quality monitoring of laser processes",
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         "year": "2025", 
         "url": "", 
         
         "author": [ 
            "David Traunecker","Michael Jarwitz","Andreas Michalowski"
         ],
         "authors": [
         	
            	{"first" : "David",	"last" : "Traunecker"},
            	{"first" : "Michael",	"last" : "Jarwitz"},
            	{"first" : "Andreas",	"last" : "Michalowski"}
         ],
         "abstract": "Pyrometric temperature measurements are essential for quality monitoring of laser processes, but still face some major challenges. Temperatures usually need to be measured with high accuracy and high spatial resolution due to the typically small process scales of laser processes. However, the temperature accuracy is affected by the angle-dependent emissivity, which can lead to incorrect temperature measurements if the local inclination angle changes, and the spatial resolution is limited by the measurement spot size, leading to reduced spatial resolutions for larger spots. \r\nThis contribution addresses these issues and presents a method to correct the angle-dependent emissivity by simultaneously measuring surface temperature and geometry, and a method to increase the spatial resolution by compensating for the effect of the transfer function of the system, caused by the size of the measurement spot, using a reconstruction algorithm. The results show good agreement with reference measurements, demonstrating the effectiveness of the proposed methods.",
         "eventtitle" : "Laser in Manufacturing (LiM)",
         
         "venue" : "Munich, Germany",
         
         "language" : "english",
         
         "eventdate" : "23 June - 26 June 2025",
         
         "bibtexKey": "traunecker2025improving"

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         "tags" : [
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         "label" : "Improving pyrometric temperature measurements for quality monitoring of laser processes",
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         "date" : "2025-07-03 08:39:37",
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         "year": "2025", 
         "url": "", 
         
         "author": [ 
            "David Traunecker","Michael Jarwitz","Andreas Michalowski"
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         "authors": [
         	
            	{"first" : "David",	"last" : "Traunecker"},
            	{"first" : "Michael",	"last" : "Jarwitz"},
            	{"first" : "Andreas",	"last" : "Michalowski"}
         ],
         "abstract": "Pyrometric temperature measurements are essential for quality monitoring of laser processes, but still face some major challenges. Temperatures usually need to be measured with high accuracy and high spatial resolution due to the typically small process scales of laser processes. However, the temperature accuracy is affected by the angle-dependent emissivity, which can lead to incorrect temperature measurements if the local inclination angle changes, and the spatial resolution is limited by the measurement spot size, leading to reduced spatial resolutions for larger spots. \r\nThis contribution addresses these issues and presents a method to correct the angle-dependent emissivity by simultaneously measuring surface temperature and geometry, and a method to increase the spatial resolution by compensating for the effect of the transfer function of the system, caused by the size of the measurement spot, using a reconstruction algorithm. The results show good agreement with reference measurements, demonstrating the effectiveness of the proposed methods.",
         "eventtitle" : "Laser in Manufacturing (LiM)",
         
         "venue" : "Munich, Germany",
         
         "language" : "english",
         
         "eventdate" : "23 June - 26 June 2025",
         
         "bibtexKey": "traunecker2025improving"

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         "id"   : "https://puma.ub.uni-stuttgart.de/bibtex/288f115b4a65e961de5c70e0d36807415/jwahl",         
         "tags" : [
            "beamcharacterisation","beampropagation","diagnostics","focusshift","laser","myown","vapor","vaporplume","welding"
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         "intraHash" : "88f115b4a65e961de5c70e0d36807415",
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         "label" : "Influence of the vapor plume on the laser beam caustic during full penetration laser welding",
         "user" : "jwahl",
         "description" : "",
         "date" : "2025-06-30 13:39:23",
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         "year": "2025", 
         "url": "", 
         
         "author": [ 
            "J. Wahl","C. Frey","D. Brinkmeier","M. Haas","F. Zaiß","S. Olschok","C. Hagenlocher","U. Reisgen","T. Graf"
         ],
         "authors": [
         	
            	{"first" : "J.",	"last" : "Wahl"},
            	{"first" : "C.",	"last" : "Frey"},
            	{"first" : "D.",	"last" : "Brinkmeier"},
            	{"first" : "M.",	"last" : "Haas"},
            	{"first" : "F.",	"last" : "Zaiß"},
            	{"first" : "S.",	"last" : "Olschok"},
            	{"first" : "C.",	"last" : "Hagenlocher"},
            	{"first" : "U.",	"last" : "Reisgen"},
            	{"first" : "T.",	"last" : "Graf"}
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         "abstract": "During deep penetration laser welding, a plume of hot metal vapor and particles is emitted from the keyhole, interacting with the incident laser beam through scattering, absorption, and phase front deformation. These interactions affect the caustic of the laser beam, potentially deteriorating weld quality. We present results from a single-shot caustic measurement of a probe laser beam, aligned coaxially with the processing laser beam. This in-situ measurement enables real-time quantification of variations in process-critical beam parameters, including pointing instabilities, focus shifts, and changes in beam quality. By analyzing the mechanisms of interaction between the laser beam and the vapor plume, our findings offer deeper insights into the interdependence of vapor plume dynamics and welding capillary fluctuations, thus advancing the understanding of laser welding processes.",
         "eventtitle" : "Laser in Manufacturing (LiM)",
         
         "venue" : "Munich, Bavaria, Germany",
         
         "language" : "english",
         
         "eventdate" : "23 June - 26 June 2025",
         
         "bibtexKey": "Wahl.2025.InfluenceVaporCaustic"

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         "id"   : "https://puma.ub.uni-stuttgart.de/bibtex/288f115b4a65e961de5c70e0d36807415/ifsw",         
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         "label" : "Influence of the vapor plume on the laser beam caustic during full penetration laser welding",
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         "author": [ 
            "J. Wahl","C. Frey","D. Brinkmeier","M. Haas","F. Zaiß","S. Olschok","C. Hagenlocher","U. Reisgen","T. Graf"
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            	{"first" : "J.",	"last" : "Wahl"},
            	{"first" : "C.",	"last" : "Frey"},
            	{"first" : "D.",	"last" : "Brinkmeier"},
            	{"first" : "M.",	"last" : "Haas"},
            	{"first" : "F.",	"last" : "Zaiß"},
            	{"first" : "S.",	"last" : "Olschok"},
            	{"first" : "C.",	"last" : "Hagenlocher"},
            	{"first" : "U.",	"last" : "Reisgen"},
            	{"first" : "T.",	"last" : "Graf"}
         ],
         "abstract": "During deep penetration laser welding, a plume of hot metal vapor and particles is emitted from the keyhole, interacting with the incident laser beam through scattering, absorption, and phase front deformation. These interactions affect the caustic of the laser beam, potentially deteriorating weld quality. We present results from a single-shot caustic measurement of a probe laser beam, aligned coaxially with the processing laser beam. This in-situ measurement enables real-time quantification of variations in process-critical beam parameters, including pointing instabilities, focus shifts, and changes in beam quality. By analyzing the mechanisms of interaction between the laser beam and the vapor plume, our findings offer deeper insights into the interdependence of vapor plume dynamics and welding capillary fluctuations, thus advancing the understanding of laser welding processes.",
         "eventtitle" : "Laser in Manufacturing (LiM)",
         
         "venue" : "Munich, Bavaria, Germany",
         
         "language" : "english",
         
         "eventdate" : "23 June - 26 June 2025",
         
         "bibtexKey": "Wahl.2025.InfluenceVaporCaustic"

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         "id"   : "https://puma.ub.uni-stuttgart.de/bibtex/223fc85dbd169b65df0c80dab133f6b46/dtraunecker",         
         "tags" : [
            "Copper","Diagnostics","Pyrometer","myown","peer","processmonitoring"
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         "intraHash" : "23fc85dbd169b65df0c80dab133f6b46",
         "interHash" : "766872e2369a90e6e4abdaf4e905598d",
         "label" : "Correcting the Influence of the Angle-Dependent Emissivity on Pyrometric Temperature Measurements for Laser Processes",
         "user" : "dtraunecker",
         "description" : "",
         "date" : "2025-02-04 10:45:10",
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         "journal": "Lasers in Manufacturing and Materials Processing",
         "year": "2025", 
         "url": "https://doi.org/10.1007/s40516-025-00279-8", 
         
         "author": [ 
            "David Traunecker","Michael Jarwitz","Andreas Michalowski"
         ],
         "authors": [
         	
            	{"first" : "David",	"last" : "Traunecker"},
            	{"first" : "Michael",	"last" : "Jarwitz"},
            	{"first" : "Andreas",	"last" : "Michalowski"}
         ],
         "abstract": "Pyrometric temperature measurements, commonly used for quality assurance in laser processes, face a significant challenge due to the angle-dependence of the emissivity, as the local geometry can vary significantly during laser processing. If the emissivity changes during the measurement due to a change in the local inclination angle, this can lead to incorrect temperature measurements for a measurement in single-color mode. Therefore, this paper presents an approach to correct the influence of the angle-dependent emissivity on the pyrometric temperature measurements by simultaneously measuring the surface temperature and the geometry. The approach is demonstrated on test samples made of copper with a defined geometry. The corrected temperatures are in good agreement with a reference measurement for all samples tested, showing that the correction was successful and that the influence of the angle-dependent emissivity can be compensated.",
         "issn" : "2196-7237",
         
         "doi" : "10.1007/s40516-025-00279-8",
         
         "bibtexKey": "Traunecker.2025.Correcting"

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         "author": [ 
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            	{"first" : "David",	"last" : "Traunecker"},
            	{"first" : "Michael",	"last" : "Jarwitz"},
            	{"first" : "Andreas",	"last" : "Michalowski"}
         ],
         "abstract": "Pyrometric temperature measurements, commonly used for quality assurance in laser processes, face a significant challenge due to the angle-dependence of the emissivity, as the local geometry can vary significantly during laser processing. If the emissivity changes during the measurement due to a change in the local inclination angle, this can lead to incorrect temperature measurements for a measurement in single-color mode. Therefore, this paper presents an approach to correct the influence of the angle-dependent emissivity on the pyrometric temperature measurements by simultaneously measuring the surface temperature and the geometry. The approach is demonstrated on test samples made of copper with a defined geometry. The corrected temperatures are in good agreement with a reference measurement for all samples tested, showing that the correction was successful and that the influence of the angle-dependent emissivity can be compensated.",
         "issn" : "2196-7237",
         
         "doi" : "10.1007/s40516-025-00279-8",
         
         "bibtexKey": "Traunecker.2025.Correcting"

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         "label" : "Practical Realization of the watt from Planck\u2019s Constant using Radiation Pressure",
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         "journal": "Metrologia","publisher":"IOP Publishing",
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         "url": "http://dx.doi.org/10.1088/1681-7575/ad844b", 
         
         "author": [ 
            "Brian J. Simonds","Kyle Rogers","Sven Schulze","David B Newell","Gordon Shaw","Johannes Wahl","Paul Williams","John H Lehman"
         ],
         "authors": [
         	
            	{"first" : "Brian J.",	"last" : "Simonds"},
            	{"first" : "Kyle",	"last" : "Rogers"},
            	{"first" : "Sven",	"last" : "Schulze"},
            	{"first" : "David B",	"last" : "Newell"},
            	{"first" : "Gordon",	"last" : "Shaw"},
            	{"first" : "Johannes",	"last" : "Wahl"},
            	{"first" : "Paul",	"last" : "Williams"},
            	{"first" : "John H",	"last" : "Lehman"}
         ],
         
         "issn" : "1681-7575",
         
         "doi" : "10.1088/1681-7575/ad844b",
         
         "bibtexKey": "Simonds.2024.RadiationPressure"

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         "label" : "Practical Realization of the watt from Planck\u2019s Constant using Radiation Pressure",
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         "author": [ 
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         ],
         "authors": [
         	
            	{"first" : "Brian J.",	"last" : "Simonds"},
            	{"first" : "Kyle",	"last" : "Rogers"},
            	{"first" : "Sven",	"last" : "Schulze"},
            	{"first" : "David B",	"last" : "Newell"},
            	{"first" : "Gordon",	"last" : "Shaw"},
            	{"first" : "Johannes",	"last" : "Wahl"},
            	{"first" : "Paul",	"last" : "Williams"},
            	{"first" : "John H",	"last" : "Lehman"}
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         "issn" : "1681-7575",
         
         "doi" : "10.1088/1681-7575/ad844b",
         
         "bibtexKey": "Simonds.2024.RadiationPressure"

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         "id"   : "https://puma.ub.uni-stuttgart.de/bibtex/23b37ab60115b38dda42d7218044dceeb/jwahl",         
         "tags" : [
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         "label" : "Interdependence of metal vapor plume and melt pool dynamics during laser beam welding under vacuum",
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         "journal": "Journal of Laser Applications","publisher":"Laser Institute of America",
         "year": "2024", 
         "url": "http://dx.doi.org/10.2351/7.0001557", 
         
         "author": [ 
            "Christian Frey","Alexander Beyel","Johannes Wahl","Thorsten Twiehaus","Simon Olschok","Christian Hagenlocher","Thomas Graf","Uwe Reisgen"
         ],
         "authors": [
         	
            	{"first" : "Christian",	"last" : "Frey"},
            	{"first" : "Alexander",	"last" : "Beyel"},
            	{"first" : "Johannes",	"last" : "Wahl"},
            	{"first" : "Thorsten",	"last" : "Twiehaus"},
            	{"first" : "Simon",	"last" : "Olschok"},
            	{"first" : "Christian",	"last" : "Hagenlocher"},
            	{"first" : "Thomas",	"last" : "Graf"},
            	{"first" : "Uwe",	"last" : "Reisgen"}
         ],
         "volume": "36","number": "4",
         "issn" : "1938-1387",
         
         "doi" : "10.2351/7.0001557",
         
         "bibtexKey": "Frey.2024.Interdependence"

      }
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         "id"   : "https://puma.ub.uni-stuttgart.de/bibtex/23b37ab60115b38dda42d7218044dceeb/ifsw",         
         "tags" : [
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         "label" : "Interdependence of metal vapor plume and melt pool dynamics during laser beam welding under vacuum",
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         "year": "2024", 
         "url": "http://dx.doi.org/10.2351/7.0001557", 
         
         "author": [ 
            "Christian Frey","Alexander Beyel","Johannes Wahl","Thorsten Twiehaus","Simon Olschok","Christian Hagenlocher","Thomas Graf","Uwe Reisgen"
         ],
         "authors": [
         	
            	{"first" : "Christian",	"last" : "Frey"},
            	{"first" : "Alexander",	"last" : "Beyel"},
            	{"first" : "Johannes",	"last" : "Wahl"},
            	{"first" : "Thorsten",	"last" : "Twiehaus"},
            	{"first" : "Simon",	"last" : "Olschok"},
            	{"first" : "Christian",	"last" : "Hagenlocher"},
            	{"first" : "Thomas",	"last" : "Graf"},
            	{"first" : "Uwe",	"last" : "Reisgen"}
         ],
         "volume": "36","number": "4",
         "issn" : "1938-1387",
         
         "doi" : "10.2351/7.0001557",
         
         "bibtexKey": "Frey.2024.Interdependence"

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         "id"   : "https://puma.ub.uni-stuttgart.de/bibtex/2f77c64411286e0752fddac4b733339bc/dtraunecker",         
         "tags" : [
            "copper","diagnostics","myown","processmonitoring","pyrometer"
         ],
         
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         "interHash" : "e0960e6b8b0a93d4c424736c59c5d902",
         "label" : "Influence of geometry variations during pyrometric temperature measurement in laser material processing",
         "user" : "dtraunecker",
         "description" : "",
         "date" : "2024-09-20 11:56:11",
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         "author": [ 
            "David Traunecker","Michael Jarwitz","Andreas Michalowski"
         ],
         "authors": [
         	
            	{"first" : "David",	"last" : "Traunecker"},
            	{"first" : "Michael",	"last" : "Jarwitz"},
            	{"first" : "Andreas",	"last" : "Michalowski"}
         ],
         "abstract": "Pyrometric temperature measurements, essential for quality assurance in laser processing, are challenged by the angular dependence of emissivity with varying local geometries. Therefore, this contribution presents investigations on the influence of geometry variations on pyrometric temperature measurements for geometry variations at different measurement positions and within the measurement spot.\r\n\r\nFor this, laser-heated copper samples with chamfers are used and the measurement spot of the pyrometer is moved over the edge of the chamfer to cover different geometric areas. Three chamfer angles and three measurement spot sizes were examined. In addition, a theoretical calculation has been performed and compared with the experimental results. The study shows the significant influence of geometry variations on the pyrometric temperature measurement.",
         "eventtitle" : "13th CIRP Conference on Photonic Technologies [LANE 2024]",
         
         "venue" : "Fürth, Germany",
         
         "language" : "englisch",
         
         "eventdate" : "15. \u2013 19. September 2024",
         
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         "id"   : "https://puma.ub.uni-stuttgart.de/bibtex/2f77c64411286e0752fddac4b733339bc/ifsw",         
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         "author": [ 
            "David Traunecker","Michael Jarwitz","Andreas Michalowski"
         ],
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            	{"first" : "David",	"last" : "Traunecker"},
            	{"first" : "Michael",	"last" : "Jarwitz"},
            	{"first" : "Andreas",	"last" : "Michalowski"}
         ],
         "abstract": "Pyrometric temperature measurements, essential for quality assurance in laser processing, are challenged by the angular dependence of emissivity with varying local geometries. Therefore, this contribution presents investigations on the influence of geometry variations on pyrometric temperature measurements for geometry variations at different measurement positions and within the measurement spot.\r\n\r\nFor this, laser-heated copper samples with chamfers are used and the measurement spot of the pyrometer is moved over the edge of the chamfer to cover different geometric areas. Three chamfer angles and three measurement spot sizes were examined. In addition, a theoretical calculation has been performed and compared with the experimental results. The study shows the significant influence of geometry variations on the pyrometric temperature measurement.",
         "eventtitle" : "13th CIRP Conference on Photonic Technologies [LANE 2024]",
         
         "venue" : "Fürth, Germany",
         
         "language" : "englisch",
         
         "eventdate" : "15. \u2013 19. September 2024",
         
         "bibtexKey": "Traunecker_2024"

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         "author": [ 
            "David Traunecker","Michael Jarwitz","Andreas Michalowski"
         ],
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            	{"first" : "David",	"last" : "Traunecker"},
            	{"first" : "Michael",	"last" : "Jarwitz"},
            	{"first" : "Andreas",	"last" : "Michalowski"}
         ],
         "volume": "124","pages": "540\u2013543","abstract": "Pyrometric temperature measurements, essential for quality assurance in laser processing, are challenged by the angular dependence of emissivity with varying local geometries. Therefore, this contribution presents investigations on the influence of geometry variations on pyrometric temperature measurements for geometry variations at different measurement positions and within the measurement spot.\r\n\r\nFor this, laser-heated copper samples with chamfers are used and the measurement spot of the pyrometer is moved over the edge of the chamfer to cover different geometric areas. Three chamfer angles and three measurement spot sizes were examined. In addition, a theoretical calculation has been performed and compared with the experimental results. The study shows the significant influence of geometry variations on the pyrometric temperature measurement.",
         "issn" : "2212-8271",
         
         "doi" : "10.1016/j.procir.2024.08.170",
         
         "bibtexKey": "Traunecker_2024"

      }
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         "author": [ 
            "David Traunecker","Michael Jarwitz","Andreas Michalowski"
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            	{"first" : "David",	"last" : "Traunecker"},
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         "url": "https://wlt.de/sites/default/files/2023-09/Contribution_223.pdf", 
         
         "author": [ 
            "Manuel Henn","Christian Hagenlocher","Daniel Holder","Daniel J. Förster","Rudolf Weber","Dennis Haasler","Marc Hummel","Alexander Olowinsky","Felix Beckmann","Julian Moosmann","Thomas Graf"
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            	{"first" : "Manuel",	"last" : "Henn"},
            	{"first" : "Christian",	"last" : "Hagenlocher"},
            	{"first" : "Daniel",	"last" : "Holder"},
            	{"first" : "Daniel J.",	"last" : "Förster"},
            	{"first" : "Rudolf",	"last" : "Weber"},
            	{"first" : "Dennis",	"last" : "Haasler"},
            	{"first" : "Marc",	"last" : "Hummel"},
            	{"first" : "Alexander",	"last" : "Olowinsky"},
            	{"first" : "Felix",	"last" : "Beckmann"},
            	{"first" : "Julian",	"last" : "Moosmann"},
            	{"first" : "Thomas",	"last" : "Graf"}
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         "abstract": "The formation of microholes during the percussion drilling of metals using ultrashort laser pulses remains poorly understood. The quality of a microhole can be affected by heat accumulation, the development of side channels, and microhole bulging due to plasma formation. Highspeed synchrotron X-ray imaging was applied to capture the space- and time-resolved evolution of the microhole shape during laser percussion drilling of stainless steel. The recorded images show that heat accumulation leads to the formation of a melt film on microhole walls, which dynamically fluctuates during drilling. Additionally, the formation of side channels was observed in the region of the maximum drilling depth where the overall fluence on the microhole walls drops below the threshold fluence. The experimentally captured quantities agree well with existing models and will significantly improve their prediction accuracy.",
         "eventtitle" : "Lasers in Manufacturing Conference",
         
         "venue" : "Munich, Germany",
         
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            	{"first" : "Marc",	"last" : "Hummel"},
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            	{"first" : "Thomas",	"last" : "Graf"}
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         "abstract": "The formation of microholes during the percussion drilling of metals using ultrashort laser pulses remains poorly understood. The quality of a microhole can be affected by heat accumulation, the development of side channels, and microhole bulging due to plasma formation. Highspeed synchrotron X-ray imaging was applied to capture the space- and time-resolved evolution of the microhole shape during laser percussion drilling of stainless steel. The recorded images show that heat accumulation leads to the formation of a melt film on microhole walls, which dynamically fluctuates during drilling. Additionally, the formation of side channels was observed in the region of the maximum drilling depth where the overall fluence on the microhole walls drops below the threshold fluence. The experimentally captured quantities agree well with existing models and will significantly improve their prediction accuracy.",
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         "author": [ 
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            	{"first" : "Manuel",	"last" : "Henn"},
            	{"first" : "Lukas",	"last" : "Schneller"},
            	{"first" : "Daniel",	"last" : "Holder"},
            	{"first" : "Dennis",	"last" : "Haasler"},
            	{"first" : "Marc",	"last" : "Hummel"},
            	{"first" : "Felix",	"last" : "Beckmann"},
            	{"first" : "Julian",	"last" : "Moosmann"},
            	{"first" : "Christian",	"last" : "Hagenlocher"},
            	{"first" : "Thomas",	"last" : "Graf"}
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         "editor": [ 
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            	{"first" : "Rainer",	"last" : "Kling"},
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         "abstract": "The comprehension of microhole formation during percussion drilling of metals using ultrashort laser pulses is still limited. The shape of a microhole can be impacted by factors like heat accumulation, the emergence of side channels, bending, and bulging. Understanding these defects is challenging due to constraints in conventional diagnostics. To address this issue, high-speed synchrotron X-ray imaging was employed to capture the spatial and temporal evolution of the microhole shape during laser percussion drilling of stainless steel. The recorded images reveal that heat accumulation leads to the creation of a melt film on the microhole walls, exhibiting dynamic fluctuations throughout the drilling process. Furthermore, a transversal widening or bulging of the microhole can be seen later in the process. Additionally, the emergence of side channels was observed in the region of maximum drilling depth, where the overall fluence on the microhole walls falls below the threshold fluence.",
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         "abstract": "The comprehension of microhole formation during percussion drilling of metals using ultrashort laser pulses is still limited. The shape of a microhole can be impacted by factors like heat accumulation, the emergence of side channels, bending, and bulging. Understanding these defects is challenging due to constraints in conventional diagnostics. To address this issue, high-speed synchrotron X-ray imaging was employed to capture the spatial and temporal evolution of the microhole shape during laser percussion drilling of stainless steel. The recorded images reveal that heat accumulation leads to the creation of a melt film on the microhole walls, exhibiting dynamic fluctuations throughout the drilling process. Furthermore, a transversal widening or bulging of the microhole can be seen later in the process. Additionally, the emergence of side channels was observed in the region of maximum drilling depth, where the overall fluence on the microhole walls falls below the threshold fluence.",
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