Ultrashort Pulse Laser Processing

Since ultrashort pulsed (USP) laser radiation is characterized by both short light-matter interaction times and high intensities, it can be used for precise and almost material-independent laser material processing with negligible heat input into the workpiece. This means that difficult-to-process materials such as carbides, ceramics and glasses can be processed with high precision.

Fraunhofer ILT develops USP beam sources that provide application-specific optimized wavelengths, powers or pulse frequencies. USP laser radiation is used for structuring of surfaces, drilling and cutting of precision components or selective thin-film ablation. Different processes can be used, for example, to achieve precise drilling diameters in the micrometer range or particularly high drilling rates. Furthermore, since the process has such low heat input and, thus, prevents melt films from forming, it can generate structure sizes down to the sub-micrometer range. In addition, composite materials such as carbon fiber-reinforced materials can be processed without wear of the tool and with low heat input into the matrix material. By developing high performance USP lasers with medium power up to the multi-kilowatt range, Fraunhofer ILT helping to scale the developed processes and thereby significantly reduce processing time.

The range of services offered by Fraunhofer ILT includes feasibility studies, experimental investigations, simulations, development of system components, validation of plant concepts, and the implementation of machine concepts.

Laser Ablation

• Laser ablation of a wide range of materials (metals, ceramics, plastics, glasses, composites) with high precision and low melt formation
• Production of tools and tool inserts
• Production of functional surfaces for alteration of wettability, friction behavior and optical properties.
• Structure sizes < 1 µm at surface precisions below 200 nm

Laser Drilling

• Precision drilling with diameters > 30 µm at drilling depth of up to 2 mm
• Microdrilling with hole diameters < 1 µm

Three-dimensional Volume Structuring

• Manufacturing of waveguides in transparent materials
• Micro-machining by selective etching

Multiphoton-Polymerization

• Fabrication of three-dimensional polymer microstructures with lateral resolutions < 1 µm

Available Laser Systems

• Picosecond laser (λ = 355 nm, 532 nm, 1064 nm) up to P = 50 W, τ = 10-15 ps
• Femtosecond laser (λ = 470 - 2700 nm) up to P = 1.5 W, τ = 100 fs and (λ = 1030 nm) up to P = 150 W, τ = 700, fs - 10 ps

Kratz, M., Kniffler, M., Häfner, C. L.:
Influence of flexible multibeam intensity distributions on selective laser-induced etching process regimes.
OPTICS EXPRESS 32(21), 36453-36468, (2024)
https://doi.org/10.1364/OE.532425 (Open Access)

Douissard, P.-A., Wollesen, L., Pauwels, K, Loiko, P., Brasse, G., Simeth, S. J., Reininghaus, M., Mathieu, J., Dujardin, C., Camy, P., Martin, T.:
Micro-patterning of scintillating films by Liquid Phase Epitaxy: A proof of concept.
OPTICAL MATERIALS 149, 114939, (11 S.), (2024)
https://doi.org/10.1016/j.optmat.2024.114939

Wollesen, L., Douissard, P., Pauwels, K., Baillard, A., Loiko, P., Brasse, G., Mathieu, J., Simeth, S., Kratz, M., Dujardin, C., Camy, P., Martin, T.:
Microstructured growth by liquid phase epitaxy of scintillating Gd3Ga5O12 (GGG) doped with Eu3+.
Journal of Alloys and Compounds 1010, 177267, (7 S.), (2024)
http://dx.doi.org/10.1016/j.jallcom.2024.177267

Schmid, F., Moreno, J., Weitenberg, J., Rußbüldt, P., Hänsch, Th. W., Udem, Th., Ozawa, A.:
An ultra-stable high-power optical frequency comb.
APL Photonics 9(2), 26105- (2024)
https://doi.org/10.1063/5.0165805 (Open Access)

Kratz, M., Rückle, L., Kalupka, C., Reininghaus, M., Häfner, C.,
Dynamic correction of optical aberrations for height-independent selective laser induced etching processing strategies.
OPTICS EXPRESS 31, 26104-26119 (2023)
https://doi.org/10.1364/OE.493088 (Open Access)

Kürschner, D., Hallum, G.,,Huber, H.,Schulz, W.:
Simulation of Laser-Induced Thermo-Mechanical Stress During Ultrafast Laser Ablation of Indium Tin Oxide with Transient Optical Properties.
JOURNAL OF LASER MICRO/NANOENGINEERING 18(3), 177–186, (2023)
https://doi.org/10.2961/jlmn.2023.03.2011

Haasler, D., Surrey, R., Bremer, P.:
Ablation of technical ceramics via cw-laser radiation and comparison with an ultrashort-pulsed laser ablation process.
24th International Symposium on Laser Precision Microfabrication, 13.-15.6.2023, Hirosaki, Japan.
Proceedings of LPM2023, C000176, (8 S.), (2023)

Simeth, S., Müller, A., Müller, J., Lekitsch, B., Reininghaus, M., Schmidt-Kaler, F.:
Selective laser-induced etching for 3D ion traps.
SPIE LASE, 2023, San Francisco, California, United States, 28 January - 3 February 2023, San Francisco, California, United States. Proceedings Volume 12409, Laser-based Micro- and Nanoprocessing XVII; 1240902 (2023). 12409, (2023)
http://dx.doi.org/10.1117/12.2647189

Danylyuk, S., Osbild, M., Korr, L., Fischer, M., Delmdahl, R., Reininghaus, M.,
Sub-micrometer structuring of surfaces with deep UV lasers.
SPIE LASE, 2023, 28 Jan - 3 Feb 2023, San Francisco, California, United States.
Proceedings Volume 12409, Laser-based Micro- and Nanoprocessing XVII (Proc. of SPIE), 1240911 (2023)
http://dx.doi.org/10.1117/12.2647865

Köller, J., Sassmannshausen, A., Kratz, M., Voß, J.,
Particle Re-Deposition During Ultrashort Pulse Laser Ablation of ITO Thin Films Using Single- and Multi-Beam Processing.
Journal of Laser Micro/Nanoengineering 17, (2022)
https://doi.org/10.2961/jlmn.2022.03.2007 (Open Access)

Grubert, N., Hofmann, O., Hesker, M., Stollenwerk, J., Holly, C.,
Beam shaping for large-area laser structuring in a roll-to-roll process.
SPIE Optical Engineering + Applications 21-26 August 2022, San Diego, California, United States.
Proceedings Volume 12216, Novel Optical Systems, Methods, and Applications XXV; 1221604 (2022)
https://doi.org/10.1117/12.2632926

Lanfermann, A., Barthels, T., Nießen, M., Abels, P., Klass, G., Riester, C., Pham, T.Q., Steffens, O.,
INNOVATIVE FILTER MODULE TO SEPARATE MICROPLASTICS FROM WASTEWATER – SIMCONDRILL.
FILTECH 2022, 8-10. March 8-10, 2022, Cologne, Germany. FILTECH : March 8-10, 2022, Cologne, Germany:the filtration event, 10 S., (2022)

He, C., Vannahme, K., Gillner, A.:
High-Efficiency Sub-Micrometer Multi-Beam Interference Structuring for Large-Scale Surface Using Ultrashort Laser Pulses.
JOURNAL OF LASER MICRO/NANOENGINEERING 14, 95-99 (2019)
https://doi.org/10.2961/jlmn.2019.01.0016

Lanfermann, A., Barthels,T., Nießen, M., Abels, P., Klass, G., Riester, C., Pham, T.Q., Steffens, O.,
Innovative Filtermodule für die Abscheidung von Mikroplastik aus Abwasser.
GWF: Wasser, Abwasser 163, 51-54 (2022)

Lanfermann, A., Barthels, T., Nießen, M., Abels, P., Klass, G., Riester, C., Pham, T.Q. Steffens, O.,
Innovative Filtermodule für die Abscheidung von Mikroplastik aus Abwasser.
F&S Filtrieren & Seprarieren F&S 01 | 2022, 28-30 (2022)

Lanfermann, A., Barthels, T., Nießen, M., Riester, C., Klass, G., Pham, T.-Q., Steffens, O., Abels, P.:
Innovative Filtermodule für die Abscheidung von Mikroplastik aus Abwasser.
13. Aachener Tagung Wassertechnologie, 29-30. Oktober, Aachen. ATW Tagungsband 173-180 (2019)

Pongratz L., Vannahme, K.,
Beam Shaping the Direct Laser Interference Patterning Spot.
Journal of Laser Micro/Nanoengineering 17, 42-49 (2022)
https://doi.org/10.2961/jlmn.2022.01.2007

Pongratz, L., Lantzsch, T., Schwedt, A.:
Impact on surface topography of interference patterned steel and brass using an ultrashort pulsed laser source.
Journal of Laser Applications 34, 31201- (2022)
https://doi.org/10.2351/7.0000555

Lüttgenau, B., Brose, S., Danylyuk, S., Stollenwerk, J., Loosen, P., Holly, C.:
Design and realization of an in-lab EUV dual beamline for industrial and scientific applications.
SPIE PHOTOMASK TECHNOLOGY + EUV LITHOGRAPHY | 27 SEPTEMBER - 8 OCTOBER 2021.
Proceedings Vol.11854, International Conference on Extreme Ultraviolet Lithography 2021; 1185419 (2021)
https://doi.org/10.1117/12.2600935

Pongratz, L., Vannahme, K.
Automated spatial period variation for Direct Laser Interference Patterning DLIP.
SPIE LASE, 2021, Online Only., Laser-based Micro- and Nanoprocessing XV; (Proc. of SPIE 11674),116740P-, (2021) 11674
https://doi.org/10.1117/12.2579507

Pongratz, L., Vannahme, K.:
Beam shaping the Direct Laser Interference Patterning spot.
The 22nd International Symposium on Laser Precision Microfabrication, June 8-11, 2021 (Web Conference).
Proceedings of LPM2021, #21-021- (7 S.), (2021)

He, C., Vannahme, K., Gillner, A.:
High-Efficiency Sub-Micrometer Multi-Beam Interference Structuring for Large-Scale Surface Using Ultrashort Laser Pulses.
JOURNAL OF LASER MICRO/NANOENGINEERING 14, 95-99 (2019)
https://doi.org/10.2961/jlmn.2019.01.0016

He, C., Vannahme, K., Gillner, A.:
High-efficiency sub-micrometer multi-beam interference structuring for large-scale surface using ultrashort laser pulses.
The 19th International Symposium on Laser Precision Microfabrication Edinburgh Conference Centre, Heriot-Watt University, Edinburgh, UK, 25-28 June, 2018.
Proceedings of LPM2018, #18-042, (X S.), (2018)

Kalupka C., Schmalstieg, M., Reininghaus, M.:
Ultrashort Pulse Processing of Transparent Ceramics: The Role of Electronic and Thermal Damage Mechanisms.
J LASER MICRO NANOEN 13 (2), 126-130 (2018)
https://doi.org/10.2961/jlmn.2018.02.0012

Gretzki, P., Gillner, A.:
Programmable diffractive optic for multi-beam processing: applications and limitations.
SPIE Nanoscience + Engineering, Aug. 25, 2017, San Diego, California. Proc. of SPIE 10347, Optical Trapping and Optical Micromanipulation XIV, 103470V (13 S.) (2017) https://doi.org/10.1117/12.2274448

Hördemann, C., Fornaroli, C., Gillner, A.:
Ultrashort pulsed laser-dicing of silicon wafers for the decollating of conventional and hybrid solar cells.
SPIE Organic Photonics + Electronics, August 06-10 2017, San Diego, California, United States. Proc. of SPIE Vol. 10363, 103632Z, (8 S.) (2017)
https://doi.org/10.1117/12.2274240

Großmann, D., Reininghaus, M., Kalupka, C., Jenne, M., Kumkar, M.:
In-situ microscopy of front and rear side ablation processes in alkali aluminosilicate glass using ultra short pulsed laser radiation.
OPTICS EXPRESS 25 (23), 28478- (11 S.) (2017)
https://doi.org/10.1364/OE.25.028478

Temmler, A., Küpper, M., Walochnik, M.A., Lanfermann, A., Schmickler, T., Bach, A., Greifenberg, T., Oreshkin, O., Willenborg, E., Wissenbach, K., Poprawe, R.:
Surface structuring by laser remelting of metals.
JLA 29, 012015 (12 S.) (2017)
http://dx.doi.org/10.2351/1.4972414

Boehr, S., Nolis, P., Brenner, A., Reininghaus, M., Lamß, M., Müller, B.:
Laserbasierte Fertigungstechniken und additive Fertigung.
Galvanotechnik 108, 1672-1677 (6 S.) (2017)

Knapp, W., Gillet, V., Courant, B., Aubignat, E., Costil, S., Langlade, C.:
Enhancement of low pressure cold sprayed copper coating adhesion by laser texturing on aluminium substrates
Proc. SPIE 10097, 100970P (13 S.) (2017)
https://doi.org/10.1117/12.2250870

Kalupka, C., Großmann, D., Reininghaus, M.:
Evolution of energy deposition during glass cutting with pulsed femtosecond laser radiation
Appl. Phys. A 123(5), 376 (7 S.) (2017)
https://doi.org/10.1007/s00339-017-1000-8

Carstens, H., Högner, M., Saule, T., Holzberger, S., Lilienfein, N., Guggenmos, A, Jocher, C., Eidam, T., Esser, D., Tosa, V., Pervak, V., Limpert, J., Tünnermann, A., Kleineberg, U., Krausz, F., Pupeza, I.:
High-harmonic generation at 250 MHz with photon energies exceeding 100  eV.
Optica 3 (4), 366-369 (2016)
https://doi.org/10.1364/OPTICA.3.000366

Grossmann, D., Reininghaus, M., Kalupka, C., Kumkar, M., Poprawe, R.:
Transverse pump-probe microscopy of moving breakdown, filamentation and self-organized absorption in alkali aluminosilicate glass using ultrashort pulse laser
Opt. Expr. 24, (20), 23221-23231 (2016)
https://doi.org/10.1364/OE.24.023221

Hambach, N., Hartmann, C., Keller, S., Gillner, A.:
High density perforation of thin Al-Foils with Ultra Short Pulse Lasers in dependence on the repetition rate
J. Laser Micro/Nanoeng, 11 (2), 192-198 (2016)
https://doi.org/10.2961/jlmn.2016.02.0009

Kalupka, C., Finger, J., Reininghaus, M.:
Time-resolved investigations of the non-thermal ablation process of graphite induced by femtosecond laser pulses
J. Appl. Phys. 119, 153105 (5 S.) (2016)
http://dx.doi.org/10.1063/1.4947190

Russbueldt, P., Mans, T., Hoffmann, D., Schippel, S.:
High-average power ultrafast Yb: Innoslab amplifier
In: Ultrashort Pulse Laser Technology: Laser Sources and Applications
Eds.: Nolte, S.; Schrempel, F.; Dausinger, F. Cham [u.a.]: Springer (2016), 117-134

Wueppen, J., Strotkamp, M., Hoffmann, D., Russbueldt, P., Mans, T., Fritzler, S., Schippel, S.:
Laser-triggered electron source for x-ray applications
In: Ultrashort Pulse Laser Technology: Laser Sources and Applications
Eds.: Nolte, S.; Schrempel, F.; Dausinger, F. Cham [u.a.]: Springer (2016), 337-349
https://doi.org/10.1007/978-3-319-17659-8_15

Blattmann, V., Trusheim, D.:
Hybrid laser-etching-process for wafer texturing
Energy Procedia 77, 766-773 (2015)

Finger, J., Kalupka C., Reininghaus, M.:
High power ultra-short pulse laser ablation of IN718 using high repetition rates
J. Materials Processing Technol. 226 (Dec.), 221-227 (2015)
https://doi.org/10.1016/j.jmatprotec.2015.07.014

Fornaroli, C., Holtkamp, J., Gillner, A.:
Dicing of thin silicon wafers with ultra-short pulsed lasers in the range from 200 fs up to 10 ps
J. Laser Micro/Nanoeng. 10 (2), 229-233 (2015)
http://dx.doi.org/10.2961/jlmn.2015.02.002

Oreshkin, O., Küpper, M., Temmler, A., Willenborg, E.:
Active reduction of waviness through processing with modulated laser power
Journal of Laser Applications 27 (2), 22004 (7 S.) (2015)
https://doi.org/10.2351/1.4906622

Reininghaus, M., Ivanov, D., Maß, T.W.W., Eckert, S., Juschkin, L., Garcia, M. E., Taubner, T., Poprawe, R.,
Nanophotonic applications of fs-laser radiation induced nanostructures and their theoretical description
Optically Induced Nanostructures. Hrsg. v. König, Karsten / Ostendorf, Andreas. Berlin: De Gruyter, 25-46 (2015)
https://doi.org/10.1515/9783110354324-006

Mincuzzi, G., Vesce, L., Schulz-Ruhtenberg, M., Gehlen, E., Reale, A., Di Carlo, A., Brown, T. M.:
Taking temperature processing out of dye-sensitized solar cell fabrication: Fully laser-manufactured devices
Adv. Energy Mat. 4, 1400421 (8 S.) (2014)
https://doi.org/10.1002/aenm.201400421

Temmler, A., Walochnik, M. A., Willenborg, E., Wissenbach, K.:
Surface structuring by remelting of titanium alloy TI6AL4V
In: Proceedings 33rd ICALEO International Congress on Applications of Lasers & Electro–Optics, October 19-23, 2014, San Diego, CA, USA
Paper ID 1401, ISBN 9781940168029 (10 S.) (2014)
https://doi.org/10.2351/1.4906387

Zibner, F., Ryll, J., Holtkamp, J., Gillner, A.:
High precision 2.5D laser cutting of thin nitinol and polyurethane for medical applications
ICALEO, 32th International Congress on Applications of Lasers& Electro-Optics: October 6-10, 2013, Miama/Fl., USA., M4154 (6 S.) (2013)
https://doi.org/10.2351/1.5062977

Reininghaus, M., Kalupka, C., Faley, O., Holtum, T., Finger, J., Stampfer, C.:
Dynamics of ultrashort pulsed laser radiation induced non-thermal ablation of graphite
Appl. Phys. A Online First (6 S.) (2014)
https://doi.org/10.1007/s00339-014-8864-7

Finger, J., Weinand, M., Wortmann, D.:
Ablation and cutting of carbon-fiber reinforced plastics using picosecond pulsed laser radiation with high average power
J. Laser Appl. 25, (4), 042007-1 (5 S.) (2013)
https://doi.org/10.2351/1.4807082

Finger, J., Weinand, M., Wortmann, D.:
Investigations on processing of carbon fiber reinforced plastics using ultrashort pulsed laser radiation with high average power
ICALEO, 32th International Congress on Applications of Lasers & Electro-Optics : October 6-10, 2013, Miama/Fl., USA, Paper 1905 (6 S.) (2013)
https://doi.org/10.2351/1.5062931

Scotti, G., Trusheim, D., Kanninen, P., Naumenko, D., Schulz-Ruhtenberg, M., Snitka, V., Kallio, T., Franssila, S.:
Picosecond laser ablation for silicon micro fuel cell fabrication
J. Micromech. Microeng. 23, 055021 (14. S.), (2013)
https://doi.org/10.1088/0960-1317/23/5/055021

Tulea, C., Caron, J., Wahab, H., Gehlich, N., Hoefer, M., Esser, D., Jungbluth, B., Lenenbach, A., Noll, R.:
Highly efficient nonthermal ablation of bone under bulk water with a frequency-doubled Nd:YVO4 picosecond laser
Proc. SPIE 8565, 85656 E-1 (11 S.) (2013)
https://doi.org/10.1117/12.2004392

Bello-Silva, . S., Wehner, M., de Paula Eduardo, C., Lampert, F., Poprawe, R., Hermans, M., Esteves-Oliveira, M.:
Precise ablation of dental hard tissues with ultra-short pulsed lasers
Lasers in Medical Science, (14 S.) (2012)
https://doi.org/10.1007/s10103-012-1107-2

Holzberger, S., Pupeza, I., Esser, D., Weitenberg, J., Carstens, H., Eidam, T., Russbüldt, P., Limpert, J., Udem, T., Tünnermann, A., Hänsch, T., Krausz, F., Fill, E.:
Sub-25 nm High-Harmonic Generation with a 78-MHz Repetition Rate Enhancement Cavity
Proc. CLEO: QELS-Fundamental Science, Optical Society of America, QTh5B.7 (2012)
https://doi.org/10.1364/QELS.2012.QTh5B.7

Eppelt, Urs:
Elektronenschauer im Glas
Laser Community, 2/2012, pp. 24-25 (2012)

Eppelt, U., Russ, S., Hartmann, C., Sun, M., Siebert, C., Schulz, W.:
Diagnostic and Simulation of PS-Laser Cutting
Proc. of the 31st Int. Congress on Applications of Lasers & Electro-Optics, ICALEO September 23-27, 2012, Anaheim, CA, USA, Paper M504, (10 S.) (2012)
http://dx.doi.org/10.2351/1.5062548

Hambach, N., Hartmann, C., Holtkamp, J., Gillner, A.:
Stability limits of laser drilled hole arrays on large areas
J. Laser Appl. 24 (3), (5 S.) (2012)
https://doi.org/10.2351/1.3702944

Michaeli, W., Eilbracht, S., Scharf, M., Hartmann, C., Bobzin, K., Bagcivan, N., Theiß, S.:
Application of variothermal heating concepts for the production of microstructured films using the extrusion embossing process 
J. Polymer Eng. 32, 95-101 (2012)
https://doi.org/10.1515/polyeng-2012-0502

Mincuzzi, G., Schulz-Ruhtenberg, M., Vesce, L., Reale, A., Di Carlo, A., Gillner, A., Brown, T.:
Laser processing of TiO₂ films for dye solar cells: a thermal, sintering, throughput and embodied energy investigation 
Progress in Photovoltaics: Research and Applications
Wiley Online Library (2012)
https://doi.org/10.1002/pip.2261

Mincuzzi, G., Zardetto, V., Vesce, L., Schulz-Ruhtenberg, M., Gillner, A., Reale, A., di Carlo, A., Brown, T.:
Raster scanning laser and UV processing of nanocrystalline TiO₂ films for sintering in dye solar cells: Device performance, throughput and embodied energy
MRS Online Proceedings Library 1447, (6 S.) (2012)
https://doi.org/10.1557/opl.2012.1092

Schaefer, M., Schulz-Ruhtenberg, M., Holtkamp, J., Gillner, A,:
Comparison of laser ablation of transparent conductive materials on flexible and rigid substrates
Proc. LOPE-C, Munich, 39-43 (2012)

Sun, M., Eppelt, U., Russe, S., Hartmann, C., Siebert, C., Zhua, J., Schulz:
Laser ablation mechanism of transparent dielectrics with picosecond laser pulses 
Proc. SPIE 8530, (9 S.) (2012)
https://doi.org/10.1117/12.976062

Wu, S., Huang, J., Beckemper, S., Gillner, A., Wang, K., Bubeck, C.:
Block polymer supramolecular assemblies hierarchically structured by three-beam interference laser ablation
J. Mat. Chem. 22 (11), 4989-4995 (2012)
https://doi.org/10.1039/C2JM16442F

Beckemper, S., Huang, J., Gillner, A., Wang, K.:
Generation of periodic micro- and nano-structures by parameter-controlled three-beam laser interference technique 
J. Laser Micro/Nanoeng. 6 (1), 49-53, (2011)
https://doi.org/10.2961/JLMN.2011.01.0011

Bobzin, K., Bagcivan, N., Gillner, A., Hartmann, C., Holtkamp, J., Michaeli, W., Klaiber, F., Schöngart, M., Theiß, S.:
Injection molding of products with functional surfaces by micro-structured, PVD coated injection molds 
Prod. Eng. 5 (4), 415-422, (2011)
https://doi.org/10.1007/s11740-011-0319-9

Bobzin, K., Bagcivan, N., Theiß, S., Hartmann, C., Holtkamp, J., Gillner, A., Michaeli, W., Hopmann, C., Eilbracht, S., Schöngart, M., Scharf, M.:
Manufacturing of micro-structured parts for mass production purposes 
Proc. of the Int. Symp. on Assembly and Manufacturing ISAM 2011, 25.5.-27.5. 2011, Tampere, Finland. (8 S.) (2011)
ISBN 978-1-61284-343-8 (digital)
https://doi.org/10.1109/ISAM.2011.5942365

Bobzin, K., Bagcivan, N., Ewering, M., Gillner, A., Beckemper, S., Hartmann, C., Theiß, S.:
Nano structured physical vapor deposited coatings by means of picosecond laser radiation 
J. Nanosci. Nanotechnol. 11, (7 S.) (2011)
https://doi.org/10.1166/jnn.2011.346

Bobzin, K., Bührig-Polaczek, A., Michaeli, W., Poprawe, R., Bagcivan, N., Beckemper, S., Eilbracht, S., Gillner, A., Hartmann, C., Holtkamp, J., Ivanov, T., Klaiber, F., Scharf, M., Schöngart, M., Theiß, S.:
Verkürzung von Prozessketten zur Herstellung von Bauteilen mit funktionalen Oberflächen mit Mikro-und Nanostrukturen 
In: Brecher, C. (Hrsg.): Integrative Produktionstechnik für Hochlohnländer, 672-734, (2011)
https://doi.org/10.1007/978-3-642-20693-1_5

Hambach, N., Hartmann, C., Holtkamp, J., Gillner, A.:
Stability limits of laser drilled hole arrays on large areas. 
ICALEO. 30. Int. Congr. on Applications of Lasers and Electro-Optics, October 23-27, 2011. M50, 895-899, (2011)

Holtkamp, J., Hartmann, C., Gillner, A., Beckemper, S., Dohrn, A., Eifel, S.:

Mikrostrukturieren mit Zukunft
Laser Technik J. 8 (2), 37-40, (2011)
https://doi.org/10.1002/latj.201190008

Ivanov, T., Bührig-Polaczek, A., Vroomen, U., Hartmann, C., Holtkamp, J., Gillner, A., Bobzin, K., Bagcivan, N., Theiss, S.:
Investment casting of surfaces with microholes and their possible applications 
Light Metals 2011. Proc. of the technical sessions presented by the TMS Aluminum Committee at the TMS 2011 Annual Meeting & Exhibition. Warrendale, Pe.: TMS, Minerals, Metals & Materials Society. Chichester: Wiley, 705-709, (2011)
https://doi.org/10.1007/978-3-319-48160-9_123

Ivanov, T., Bührig-Polaczek, A., Vroomen, U., Hartmann, C., Holtkamp, J., Gillner, A., Bobzin, K., Bagcivan, N., Theiss, S.:
Replication of specifially microstructured surfaces in A356-alloy via lost wax investment casting
J. Micromech. Microeng. 21, 85026-85026, (2011)
https://doi.org/10.1088/0960-1317/21/8/085026

Michaeli, W., Schöngart, M., Klaiber, F., Beckemper, S.:
Production of superhydrophobic surfaces using a one-step variothermal injection moulding process
Micro Nanosystems 3, 222-225, (2011)
http://dx.doi.org/10.2174/1876402911103030222

Schaefer, M., Holtkamp, J., Gillner, A.:
Ablation of PEDOT/PSS with excimer lasers for micro structuring of organic electronic devices
Synth. Met. 161, 1051-1057, (2011)
https://doi.org/10.1016/j.synthmet.2011.03.014

Schaefer, M., Esser, A., Holtkamp, J., Gillner, A.:
Laser ablation of transparent conducting materials for organic electronics 
Proc. of Large-Area, Organic and Polymer Electronics Convention 2011 (LOPE-C 11), June 2011, Frankfurt/M. Frankfurt/M.: Organics Electronics Association, 159-163, (2011)

Schulz-Ruhtenberg, M., Trusheim, D., Das, J., Krantz, S., Wieduwilt, J:
Influence of pulse duration in picosecond laser ablation of silicon nitride layers 
Energy Proced. 8, 614-619, (2011)
https://doi.org/10.1016/j.egypro.2011.06.191

Schulz-Ruhtenberg, M., Häberle, A., Russell, A., Hernández, J. L., Krantz, S.:
Influence of the pulse width for visible pulsed laser doping for crystalline solar cells using phosphosilicate glass 
J. Laser Micro/Nanoeng. 6 (1), 64-68, (2011)
https://doi.org/10.2961/jlmn.2011.01.0014

Sedao, X., Sarnet, T., Hernandez, J. L., Schulz-Ruhtenberg, M., Krantz, S.:
Edge isolation using ultra-short pulse laser materials with a top-hat beam profile 
Adv. Mat. Res. 321, 234-239, (2011)
https://doi.org/10.4028/www.scientific.net/AMR.321.234

Trusheim, D., Schulz-Ruhtenberg, M., Baier, T., Krantz, S., Bauer, D., Das, J.:
Investigation of the influence of pulse duration in laser processes for solar cells 
Phys. Proc.12, 278-285, (2011)
https://doi.org/10.1016/j.phpro.2011.03.134

Hoerstmann-Jungemann, M., Dobrzanski, D., Schaefer, D., Kelbassa, I.:
Functionalization of sapphire surfaces using fs-laser radiation and selective etching
ICALEO. 30. Int. Congr. on Applications of Lasers and Electro-Optics, October 23-27, 2011. M 1203, 1105-1110, (2011)
https://doi.org/10.2351/1.5062187

Reininghaus, M., Finger, J., Faley, O., Wortmann, D., Stampfer, C.:
Non-thermal ablation of graphite by ultrashort pulsed fs-laser radiation
ICALEO. 30. Int. Congr. on Applications of Lasers and Electro-Optics, October 23-27, 2011. N 102, (8 S.) (2011)
https://doi.org/10.2351/1.5062201

Schaefer, D., Beckmann, D., Hoerstmann-Jungemann, M., Kelbassa, I.
Waveguides and markings inside transparent materials by fs-laser radiation
ICALEO 30. Int. Congr. on Applications of Lasers and Electro-Optics, October 23-27, 2011. M1004, (5 S.) (2011)
https://doi.org/10.2351/1.5062180

Trusheim, D., Schulz-Ruhtenberg, M., Smeets, M., Das, J., Wieduwilt, J.:
Influence of ultra-short pulse laser ablation of silicon nitride passivation layers on electronical cell properties
26th European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC), Hamburg, (1 S.) (2011)

Wortmann, D., Reinighaus, M., Finger, J., Dold, C., Russbueldt, P., Poprawe, R.:
The physics in applications of ultrafast lasers
Proc. SPIE 8306, 830603, (6 S.) (2011)
https://doi.org/10.1117/12.911309

Kelbassa, I., Wortmann, D., Mans, T., Gottmann, J., Russbueldt, P., Weitenberg, J., Brajdic, M., Hermans, M., Beckmann, D., Poprawe, R.:
High-power ultra-short pulse laser radiation: New sources as key enablers for emerging applications
Pacific International Conference on Applications of Lasers and Optics (PICALO), Shangri-La Hotel, Wuhan, China, (6 S.) (2010)
https://doi.org/10.2351/1.5057186

Gillner, A.:
Laser micro-structuring 
In: YI Qin: Micromanufacturing Engineering and Technology, Norwich, N.Y.: W. Andrew Publ. 2010. pp. 59-67.
ISBN 978-0-8155-1545-6

Huang, J., Wu, S., Beckemper, Gillner, A.
All-optical fabrications of ellipsoidal caps on azobenzene functional polymers
Opt. Lett. 35 (16), 2711-2713, (2010)
https://doi.org/10.1364/ol.35.002711

Schaefer, M., Jacobs, P., Bauer, D., Moll, D., Gillner, A.:
Investigation and development of a molding process for the production of micro-hairs 
Int. J. Adv. Manuf. Technol. 51, 935-944, (2010)
https://doi.org/10.1007/s00170-010-2670-y

Schulz-Ruhtenberg, M., Haeberle, A., Russell, R., Hernández, J.L., Krantz, S.:
Quest for the ideal laser for an industrial laser doping process for crystalline solar cells
LPM 2010 - 11th International Symposium on Laser Precision Microfabrication, Stuttgart, (5 S.) (2010)

Schulz-Ruhtenberg, M., Hernandez, J. L., Prajapati, V., Bleidiessel, R., Morilla, C., Larmanda, Y., Vervisch, V., Sarnet, T., Olowinsky, A.:
Direct laser doping for high-efficiency solar cells
ICALEO 2009, 28th International Congress on Applications of Lasers & Electro-Optics, (4 S.) (2009)
https://doi.org/10.2351/1.5061472

Temmler, A., Willenborg, E., Pirch, N., Wissenbach, K.:
Structuring by remelting
Proc. of the 5th Int. WLT Conf. on Lasers in Manufacturing 2009, Munich, June 15th - 18th, 2009. Ed. by A. Ostendorf [u.a.] Stuttgart: AT-Fachverlag, pp. 403-407, (2009)

Esser, D., Mahlmann, D., Wortmann, D., Gottmann, J.:
Interference microscopy of femtosecond laser written waveguides in phosphate glass
Appl. Phys. B - Lasers and Optics 96 (2-3), (5 S.) (2009)
https://doi.org/10.1007/s00340-009-3509-9

Mingareev, I., Horn, A.:
Melt dynamics of aluminium irradiated with ultrafast laser radiation at large intensities
J. Appl. Phys. 106, 13513, (7 S.) (2009)
https://doi.org/10.1063/1.3159882

Wortmann, D., Mingareev, I., Brand, A., Horn, A.:
Micro-welding of glass by fs-laser irradiation and process observation using fs-pump-probe white light interference microscopy
Conference on Lasers and Electro-Optics 2009 and the European Quantum Electronics Conference. CLEO Europe - EQEC 2009, Munich, Mulhouse: European Physical Society, CM2.2 THU, (1 S.) (2009)

Horn, A., Mingareev, I., Gottmann, J., Werth, A., Brenk, U.:
Dynamical detection of optical phase changes during micro-welding of glass with ultra-short laser radiation
Meas. Sci. Technol 19, (6 S.) (2008)
https://doi.org/10.1088/0957-0233/19/1/015302

Gottmann, J., Wortmann, D., Hörstmann-Jungemann, M.:
Fabrication of sub-wavelength surface ripples and in-volume nanostructures by fs-laser induced selective etching
Appl. Surf. Sci. doi. 10.1016/j.apsusc.2008.10.097 (Online), (2008)
https://doi.org/10.1016/j.apsusc.2008.10.097

Wortmann, D., Gottmann, J.:
Fs-Laser structuring of ridge waveguides
Appl. Phys. A 93, 197-201, (2008)
https://doi.org/10.1007/s00339-008-4652-6

Ganser, D., Starovoytova, L., Wortmann, D., Gottmann, J., Vasilief, I. Moiseev, L.:
Growth of Nd:Gd3Ga5O12 thin films by pulsed laser deposition for planar waveguide laser
J. Laser Micro/Nanoeng. 3, 19-23, (2008)

Poprawe, R., Gillner, A., Hoffmann, D., Gottmann, J., Wawers, W., Schulz, W.:
High speed high precision ablation from ms to fs
Proc. SPIE 7005, (12 S.) (2008)
https://doi.org/10.1117/12.785225

Gillner, A.
Laser micro processing
Laser Technik J. 5, 27-30, (2008)

Horn, A., Mingareev, I., Werth, A., Kachel, M., Brenk, U.:
Investigations on ultrafast welding of glass-glass and glass-silicon
Appl. Phys. A 93, 171-175, (2008)
https://doi.org/10.1007/s00339-008-4654-4

Horn, A., Mingareev, I., Werth, A., Kachel, M.:
Joining of thin glass with semiconductors by ultra-fast high-repetition laser welding
Proc. SPIE 6880, (6 S.) (2008)
https://doi.org/10.1117/12.762337

Gottmann, J., Moiseev, L., Vasilief, I., Wortmann, D.:
Manufacturing of Er:ZBLAN ridge waveguides by pulsed laser deposition and ultrafast laser micromachining for green integrated lasers
Mat. Sci. Eng. B 146, 245-251, (2008)
https://doi.org/10.1016/j.mseb.2007.07.088

Gottmann, J., Wortmann, D., Wagner, R.:
Manufacturing of periodical nanostructures by fs-laser direct writing
Proc. SPIE 7022, 702202-1-702202-10, (2008)
https://doi.org/10.1117/12.803901

Wortmann, D., Gottmann, J., Brandt, N., Horn-Solle, H.:
Micro- and nanostructures inside sapphire by fs-laser irradiation and selective etching
Opt. Expr. 16 (3), 1517-1522, (2008)
https://doi.org/10.1364/OE.16.001517

Horn, A., Mingareev, I., Werth, A., Kachel, M., Brenk, U.:
Non-interferometric transient quantitative phase microscopy for ultrafast engineering
Appl. Phys. A 93, 165-169, (2008)
https://doi.org/10.1007/s00339-008-4657-1

Mingareev, I., Horn, A.:
Time-resolved investigations of plasma and melt efections in metals by pump-probe shadowgraphy
Appl. Phys. A 92, 917-920, (2008)
https://doi.org/10.1007/s00339-008-4562-7

Hörstmann-Jungemann, M., Gottmann, J., Wortmann, D.:
Time resolved measurement of the dielectric function during direct fs-laser writing of SiO2 and sapphire
Proc. LPM2008 - 9th Int. Symposium on Laser Precision Microfabrication, (5 S.) (2008)

Miyamoto, I., Horn, A., Gottmann, J., Wortmann, D., Yoshino, F.:
Fusion Welding of Glass Using Femtosecond Laser Pulses with High-repetition Rates
J. Laser Micro/Nanoeng. 2, 57-63, (2007)
https://doi.org/10.2961/jlmn.2007.01.0011

Miyamoto, I., Horn, A., Gottmann, J.:
Local Melting of Glass Material and Its Application to Direct Fusion Welding by Ps-laser Pulses
J. Lasermicro/Nanoeng. 2, 7-14, (2007)
https://doi.org/10.2961/jlmn.2007.01.0002

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