Dr. Thomas Willemsen Profile

Dr. Thomas Willemsen

Optical Engineer at LASEROPTIK GmbH

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Author

Publications (13)

Proceedings Article | 24 November 2023 Presentation + Paper

Dielectric quantized nanolaminates for laser optics

Thomas Willemsen

Proceedings Volume 12726, 127260D (2023) https://doi.org/10.1117/12.2685241

KEYWORDS: Dielectrics, Refractive index, Manufacturing, Optics manufacturing, Composites, Quantum wells, Laser damage threshold, Design and modelling, Laser optics

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Proceedings Article | 2 December 2022 Presentation + Paper

Comparison of high power sputtered dielectric mirrors for PW laser

T. Willemsen, T. Groß, M. Gauch, H. Ehlers, D. Kramer, P. Velpula, Wolfgang Ebert

Proceedings Volume 12300, 123000H (2022) https://doi.org/10.1117/12.2642134

KEYWORDS: Mirrors, Laser induced damage, Manufacturing, Optical coatings, Optics manufacturing, Dielectrics, Sputter deposition, Dielectric mirrors, Femtosecond lasers

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SPIE Journal Paper | 23 April 2022 Open Access

Damage threshold affected by the spatiotemporal evolution of femtosecond laser pulses in multilayer structures

Amir Khabbazi Oskouei, Matthias Lenzner, Luke Emmert, Marco Jupé, Thomas Willemsen, Morten Steinecke, Detlev Ristau, Wolfgang Rudolph

OE, Vol. 61, Issue 07, 071602, (April 2022) https://doi.org/10.1117/12.10.1117/1.OE.61.7.071602

KEYWORDS: Mirrors, Femtosecond phenomena, Multilayers, Laser induced damage, Laser damage threshold, Finite element methods, Optical engineering, Optical coatings, Silica, Reflectivity

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Proceedings Article | 19 November 2021 Presentation + Paper

Spatio-temporal evolution of femtosecond laser pulses in dielectric multi-layers controlling the damage behavior

Matthias Lenzner, Amir Khabbazi Oskouei, Luke Emmert, Marco Jupé, Thomas Willemsen, Morten Steinecke, Detlev Ristau, Wolfgang Rudolph

Proceedings Volume 11910, 1191012 (2021) https://doi.org/10.1117/12.2600528

KEYWORDS: Mirrors, Femtosecond phenomena, Dielectrics, Reflectivity, Laser induced damage, Laser damage threshold, Oxides, Fourier transforms, Superposition

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Proceedings Article | 16 November 2018 Paper

Femtosecond laser-induced modifications of frequency tripling mirrors

Amir Khabbazi Oskouei, Sebastian Baur, Luke Emmert, Marco Jupe, Thomas Willemsen, Morten Steinecke, Lars Jensen, Detlev Ristau, Wolfgang Rudolph

Proceedings Volume 10805, 108051W (2018) https://doi.org/10.1117/12.2500675

KEYWORDS: Absorption, Mirrors, Reflection, Temperature metrology, Femtosecond phenomena, Refractive index, Dielectrics, Third-harmonic generation, Silica, Thin films

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Proceedings Article | 16 November 2018 Paper

Study of the role of the interface on the defect density in HfO2 films using STEREO-LID (Spatio-TEmporally REsolved Optical Laser-Induced Damage)

Luke Emmert, Sebastian Töpfer, Thomas Willemsen, Marco Jupé, Detlev Ristau, Wolfgang Rudolph

Proceedings Volume 10805, 108052H (2018) https://doi.org/10.1117/12.2500291

KEYWORDS: Interfaces, Laser induced damage, Hybrid fiber optics, Silica, Laser optics, Multilayers, Ion beams, Sputter deposition, Laser damage threshold, Absorption

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Proceedings Article | 22 March 2018 Paper

Approaches toward optimized laser-induced damage thresholds of dispersive compensating mirrors applying nanolaminates

T. Willemsen, M. Brinkmann, M. Jupé, M. Gyamfi, S. Schlichting, D. Ristau

Proceedings Volume 10447, 1044712 (2018) https://doi.org/10.1117/12.2281126

KEYWORDS: Mirrors, Refractive index, Dielectrics, Laser damage threshold, Optics manufacturing, Quantum wells

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Proceedings Article | 6 December 2016 Paper

Electronic quantization in dielectric nanolaminates

T. Willemsen, P. Geerke, M. Jupé, L. Gallais, D. Ristau

Proceedings Volume 10014, 100140C (2016) https://doi.org/10.1117/12.2244828

KEYWORDS: Dielectrics, Refractive index, Composites, Manufacturing, Electrons, Optics manufacturing, Hybrid fiber optics, Quantum wells, Laser damage threshold, Quantization

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Proceedings Article | 6 December 2016 Paper

Dual wavelength laser damage mechanisms in the ultra-short pulse regime

Mark Gyamfi, Marion Costella, Thomas Willemsen, Peter Jürgens, Mathias Mende, Lars Jensen, Detlev Ristau

Proceedings Volume 10014, 100141B (2016) https://doi.org/10.1117/12.2245156

KEYWORDS: Laser induced damage, Laser damage threshold, Reflectivity, Mirrors, Hybrid fiber optics, Aluminum, Niobium, Tantalum, Refractive index, Femtosecond phenomena

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Proceedings Article | 6 December 2016 Paper

Improved LIDT values for dielectric dispersive compensating mirrors applying ternary composites

T. Willemsen, S. Schlichting, M. Gyamfi, M. Jupé, H. Ehlers, U. Morgner, D. Ristau

Proceedings Volume 10014, 100141Z (2016) https://doi.org/10.1117/12.2244835

KEYWORDS: Composites, Mirrors, Dielectrics, Dielectric mirrors, Curium, Tantalum, Laser damage threshold, Reverse engineering, Laser induced damage, Detection and tracking algorithms

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Proceedings Article | 23 September 2015 Paper

Optimization of novel phase separating IBS process

Marco Jupé, Thomas Willemsen, Sina Malobabic, Kornelia Schuba, Detlev Ristau

Proceedings Volume 9627, 96270K (2015) https://doi.org/10.1117/12.2191229

KEYWORDS: Magnetism, Ions, Sputter deposition, Particles, Optical coatings, Ion beams, Particle contamination, Ionization, Electrons, Thin film coatings

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Proceedings Article | 23 September 2015 Paper

Direct in situ GDD measurement in optical coating process

S. Schlichting, T. Willemsen, H. Ehlers, U. Morgner, D. Ristau

Proceedings Volume 9627, 96271S (2015) https://doi.org/10.1117/12.2191215

KEYWORDS: In situ metrology, Mirrors, Coating, Optical coatings, Spectroscopy, Light sources, Interferometry, Optical testing, Michelson interferometers, Algorithm development

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Proceedings Article | 23 September 2015 Paper

Precise fabrication of ultra violet dielectric dispersion compensating mirrors

T. Willemsen, S. Schlichting, T. Kellermann, M. Jupé, H. Ehlers, U. Morgner, D. Ristau

Proceedings Volume 9627, 96271U (2015) https://doi.org/10.1117/12.2191051

KEYWORDS: Ultraviolet radiation, Mirrors, Near infrared, In situ metrology, Reflectivity, Dielectric dispersion, Dielectric mirrors, Spectroscopy, Solids, Silica

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Showing 5 of 13 publications

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