Dr. Jens Gottmann Profile

Dr. Jens Gottmann

CEO at LightFab GmbH

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Publications (17)

Proceedings Article | 4 March 2019 Presentation

Subtractive 3D printing glass by SLE: Applications and combination with ultrafast laser glass welding (Conference Presentation)

Jens Gottmann, Martin Hermans, Jürgen Ortmann

Proceedings Volume 10908, 109080D (2019) https://doi.org/10.1117/12.2510054

KEYWORDS: Glasses, 3D printing, Beam steering, Silica, Laser crystals, Crystals, Microfluidics, Quartz, Etching, Ultrafast lasers

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By internal modification of transparent glasses and crystals with ultrafast laser radiation and subsequent wet-chemical etching (here named SLE = selective laser-induced etching), very precise 3D structures have been produced, especially in quartz glass (fused silica), for more than a decade. By the combination of a high precision three-axis system to move the glass sample and a fast 3D beam steering system to move the laser focus, the SLE process is now suitable to produce more complex structures in a shorter time [1]. We have programmed a printer driver for commercial CAD software and the flexible machine software enabling automated production of complex 3D glass parts with the LightFab 3D Printer. Some examples of 3D precision glass parts e.g. for lab-on-a-chip applications (cell-sorting microfluidics), electronics (glass via and connectors), semiconductor (quartz chucks), optics and precision mechanics are presented. The SLE process is very scalable for high throughput since a faster writing speed results in higher selectivity and thus larger precision of the resulting structures. Thus SLE is a process which is suitable for mass production of 3D structures in glasses. Some examples of rapidly produced structures using our high speed beam deflection modules are demonstrated, which are the basis of our special machines enabling mass-production. Since the LightFab 3D Printer includes an ultrafast laser with programmable pulse duration and variable repetition rates also other in-volume processes than SLE like 2-photon-polymerization, direct writing of waveguides in glasses, internal glass welding can be done in the same machine. As example of process chains the combination of SLE with glass welding by ultrafast laser radiation will be shown. [1] J. Gottmann, M. Hermans, N. Repiev, J. Ortmann (2017) Selective Laser-Induced Etching of 3D Precision Quartz Glass Components for Microfluidic Applications—Up-Scaling of Complexity and Speed, Micromachines 8, pp. 110-120

Proceedings Article | 14 March 2018 Presentation

Selective laser-induced etching (SLE): A scalable subtractive 3D printing process for transparent glasses and crystals (Conference Presentation)

Jens Gottmann, Martin Hermans, Nikolai Repiev, Jürgen Ortmann

Proceedings Volume 10522, 105220X (2018) https://doi.org/10.1117/12.2290401

KEYWORDS: Glasses, 3D printing, Etching, Laser crystals, Quartz, Ultrafast lasers, Crystals, Beam steering, Micromachining, Nonimpact printing

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Proceedings Article | 15 March 2013 Paper

High speed micro scanner for 3D in-volume laser micro processing

D. Schaefer, J. Gottmann, M. Hermans, J. Ortmann, I. Kelbassa

Proceedings Volume 8608, 860808 (2013) https://doi.org/10.1117/12.2008205

KEYWORDS: 3D scanning, Laser scanners, Scanners, Silica, Femtosecond phenomena, Microfluidics, Etching, Laser processing, Picosecond phenomena, Glasses

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Proceedings Article | 20 February 2012 Paper

In-situ diagnostics on fs-laser-induced modification of glasses for selective etching

Martin Hermans, Jens Gottmann, Anna Schiffer

Proceedings Volume 8244, 82440E (2012) https://doi.org/10.1117/12.912765

KEYWORDS: Refractive index, Temperature metrology, Absorption, Microscopy, Glasses, Microscopes, Pulsed laser operation, Diagnostics, Image analysis, Etching

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Proceedings Article | 24 February 2009 Paper

In-volume waveguides by fs-laser direct writing in rare-earth-doped fluoride glass and phosphate glass

D. Esser, D. Wortmann, J. Gottmann

Proceedings Volume 7205, 720510 (2009) https://doi.org/10.1117/12.808736

KEYWORDS: Waveguides, Refractive index, Glasses, Microscopy, Phase shifts, Thermal effects, ZBLAN, Femtosecond phenomena, Wave propagation, Pulsed laser operation

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Proceedings Article | 5 June 2008 Paper

Manufacturing of periodical nanostructures by fs-laser direct writing

J. Gottmann, D. Wortmann, R. Wagner

Proceedings Volume 7022, 702202 (2008) https://doi.org/10.1117/12.803901

KEYWORDS: Waveguides, Pulsed laser operation, Polarization, Laser scattering, Silica, Fiber lasers, Femtosecond phenomena, Silicon, Laser ablation, Manufacturing

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Proceedings Article | 14 May 2008 Open Access

High speed high precision ablation from ms to fs

Reinhart Poprawe, Arnold Gillner, Dieter Hoffmann, Jens Gottmann, Welf Wawers, Wolfgang Schulz

Proceedings Volume 7005, 700502 (2008) https://doi.org/10.1117/12.785225

KEYWORDS: Neodymium, Laser ablation, Picosecond phenomena, Radium, Laser drilling, Pulsed laser operation, Erbium, Diffraction, Fiber lasers, Disk lasers

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Proceedings Article | 20 February 2008 Paper

Highspeed manufacturing of periodical surface and in-volume nanostructures by fs-laser direct writing

J. Gottmann, D. Wortmann, N. Brandt

Proceedings Volume 6879, 68790N (2008) https://doi.org/10.1117/12.758353

KEYWORDS: Etching, Waveguides, Silica, Nanostructures, Polarization, Scanning electron microscopy, Manufacturing, Sapphire, Pulsed laser operation, Femtosecond phenomena

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Proceedings Article | 20 March 2007 Paper

Laser deposition and structuring of laser active planar waveguides of Er:ZBLAN, Nd:YAG and Nd:GGG for integrated waveguide lasers

Jens Gottmann, Leonid Moiseev, Dirk Wortmann, Ion Vasilief, Larisa Starovoytova, Dimitri Ganser, Ralph Wagner

Proceedings Volume 6459, 64590W (2007) https://doi.org/10.1117/12.706845

KEYWORDS: Waveguides, Semiconductor lasers, Waveguide lasers, Nd:YAG lasers, Crystals, Pulsed laser deposition, Gallium, Femtosecond phenomena, Thin films, Laser ablation

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Proceedings Article | 1 March 2006 Paper

Sub-wavelength ripple formation on dielectric and metallic materials induced by tightly focused femto-second laser radiation

J. Gottmann, R. Wagner

Proceedings Volume 6106, 61061R (2006) https://doi.org/10.1117/12.644560

KEYWORDS: Polarization, Dielectrics, Electrons, Pulsed laser operation, Femtosecond phenomena, Silicon, Laser scattering, Metals, Silica, Laser ablation

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Proceedings Article | 8 October 2004 Paper

Formation of subwavelength-laser-induced periodic surface structures by tightly focused femtosecond laser radiation

Ralph Wagner, Jens Gottmann, Alexander Horn, Ernst Kreutz

Proceedings Volume 5662, (2004) https://doi.org/10.1117/12.596313

KEYWORDS: Silica, Femtosecond phenomena, Silicon, Polarization, Scanning electron microscopy, Refractive index, Semiconductor lasers, Thin films, Pulsed laser operation, Atomic force microscopy

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Proceedings Article | 15 July 2004 Paper

Model for the expansion dynamics of the laser-induced plasma and fabrication of erbium-doped planar waveguides by pulsed laser deposition and laser micromachining for up-conversion applications

Jens Gottmann, Georg Schlaghecken, Ernst Wolfgang Kreutz

Proceedings Volume 5339, (2004) https://doi.org/10.1117/12.528960

KEYWORDS: Particles, Plasma, Erbium, Pulsed laser deposition, Crystals, Barium, Laser applications, Thin films, Luminescence, Semiconductor lasers

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Proceedings Article | 15 April 2003 Paper

Fabrication of erbium-doped planar waveguides by pulsed-laser deposition and laser micromachining

Jens Gottmann, Georg Schlaghecken, Ralph Wagner, Ernst Kreutz

Proceedings Volume 4941, (2003) https://doi.org/10.1117/12.468507

KEYWORDS: Waveguides, Pulsed laser deposition, Thin films, Picosecond phenomena, Pulsed laser operation, Femtosecond phenomena, Erbium, Micromachining, Crystals, Plasma

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Proceedings Article | 29 June 2001 Paper

PLD of hard ceramic coatings

Yibran Perera, Jens Gottmann, Andreas Husmann, Thomas Klotzbuecher, Ernst-Wolfgang Kreutz, Reinhart Poprawe

Proceedings Volume 4274, (2001) https://doi.org/10.1117/12.432550

KEYWORDS: Particles, Raman spectroscopy, Thin films, Refractive index, Chemical species, Ions, Polymethylmethacrylate, Molecules, Ceramics, Electroluminescence

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Proceedings Article | 26 May 1998 Paper

Growth of ceramic thin films by pulsed laser deposition: the role of the kinetic energy of laser-ablated particles

Jens Gottmann, Thomas Klotzbuecher, Ernst-Wolfgang Kreutz

Proceedings Volume 3404, (1998) https://doi.org/10.1117/12.308606

KEYWORDS: Particles, Thin films, Dielectrics, Ferroelectric materials, Refractive index, Pulsed laser deposition, Zirconium dioxide, Barium, Oxygen, Molecules

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Proceedings Article | 26 May 1998 Paper

Raman spectroscopy on BaTiO3 ferroelectric thin films deposited by a hybrid DC-field-enhanced PLD process

Thomas Klotzbuecher, M. Mergens, Andreas Husmann, Jens Gottmann, Ernst-Wolfgang Kreutz

Proceedings Volume 3404, (1998) https://doi.org/10.1117/12.308635

KEYWORDS: Ferroelectric materials, Raman spectroscopy, Crystals, Thin films, Dielectrics, Plasma, Laser crystals, Phonons, Pulsed laser deposition, Atmospheric plasma

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Proceedings Article | 26 May 1998 Paper

DLC thin film growth under energetic particle bombardment: a comparison between PLD and rf-bias enhanced PLD

Thomas Klotzbuecher, Jens Gottmann, M. Meyer, David Wesner, Ernst-Wolfgang Kreutz

Proceedings Volume 3404, (1998) https://doi.org/10.1117/12.308599

KEYWORDS: Ions, Raman spectroscopy, Particles, Carbon, Laser processing, Pulsed laser deposition, Laser bonding, Chemical species, Thin film growth, Electrodes

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Showing 5 of 17 publications

Conference Committee Involvement (1)

Laser Applications in Microelectronic and Optoelectronic Manufacturing X

24 January 2005 | San Jose, California, United States

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