prof.dr.ir. G.R.B.E. Römer (Gert-Willem)

After obtaining a Master degree in Electrical Engineering, I obtained a PhD degree at the University of Twente, on Modelling and control of laser surface treatment, in 1999. Ever since, my scientific interests are on the fundamental physical phenomena occurring during laser‐material inter-action, in order to optimize laser‐material processing for laser‐based manufacturing. Main processes are material processing using ultra short pulsed laser sources for micro‐ and nano‐machining, and laser cladding and additive manufacturing (3D printing) using high power laser sources. As well as, the development of models, as well as sensors and real‐time control algorithms for laser‐material processes (to ensure reliable processing results).

From 2008 to 2017, I was an associate professor at the chair of Applied Laser Technology at the University of Twente. From 2017 I was an associate professor, and since 2020 I am full professor of the research chair Laser Processing.

Besides chair holder of the research chair, I am Research Coordinator of the department of Mechanics of Solids, Surfaces & Systems (MS3).

Engineering & Materials Science

# Laser Pulses
# Lasers
# Picosecond Lasers
# Pulsed Lasers
# Surface Structure

Physics & Astronomy

# Lasers
# Pulses
# Ultrashort Pulsed Lasers

Faculty of Engineering Technology (ET), Laser Processing (LP)

My main research interests include:

fundamental physical phenomena occurring during laser-material interaction
optimizing laser-material processing for laser-based manufacturing
material processing using ultra short pulsed laser sources, in the fs and ps regime, for micro- and nano-machining
high power laser surface treatment
high power laser-based Directed Energy Deposition, an Additive Manufacturing technique
means and methods for monitoring/sensing and control of laser-material processing systems
applications of innovative laser-based manufacturing

Sattari, M. , Luckabauer, M. , & Römer, G. R. B. E. (2022). Thermo-fluidic behavior to solidification microstructure texture evolution during laser-assisted powder-based direct energy deposition: An integrated approach. In R. A. M. F. van Outvorst, & A. J. J. T. van Litsenburg (Eds.), Twenty-fifth Engineering Mechanics Symposium, October 25-October 26, 2022. Hotel Papendal, Arnhem (pp. 38-38). Eindhoven University of Technology.

Capuano, L. , Berenschot, J. W. , Tiggelaar, R. M. , Feinaeugle, M. , Tas, N. R. , Gardeniers, J. G. E. , & Römer, G. R. B. E. (2022). Fabrication of microstructures in the bulk and on the surface of sapphire by anisotropic selective wet etching of laser-affected volumes. Journal of micromechanics and microengineering, 32(12), [125003]. https://doi.org/10.1088/1361-6439/ac9911

Ebrahimi, A. , Sattari, M. , Bremer, S. J. L. , Luckabauer, M. , Römer, G-W. R. B. E., Richardson, I. M., Kleijn, C. R., & Hermans, M. J. M. (2022). The influence of laser characteristics on internal flow behaviour in laser melting of metallic substrates. Materials & Design, 214, 1-14. [110385]. https://doi.org/10.1016/j.matdes.2022.110385

Mustafa, H. , Matthews, D. T. A. , & Römer, G. R. B. E. (2022). Wavelength dependence of picosecond-pulsed laser ablation of hot-dip galvanized steel. Applied physics A: Materials science and processing, 128, [296]. https://doi.org/10.1007/s00339-022-05393-4

Römer, G. R. B. E. , & Capuano, L. (2021). Ultra‐short pulsed laser processing of sapphire. In Proceedings of the 2021 International Conference on Electronic Materials (2021 IUMRS-ICEM) and the XIX Brazilian Materials Research Society Meeting (XIX B-MRS) [4DZM]

Mustafa, H. , Feinaeugle, M. , & Römer, G. R. B. E. (2021). Surface carbon enrichment of stainless steel using nanosecond pulsed laser surface alloying of a graphite based coating. Paper presented at Lasers in Manufacturing 2021, Munich, Bavaria, Germany.

van der Linden, S. , Hagmeijer, R. , & Römer, G. R. B. E. (2021). Picosecond pulsed underwater laser ablation of silicon and stainless steel: Comparing crater analysis methods and analysing dependence of crater characteristics on water layer thickness. Applied surface science, 540, [148005]. https://doi.org/10.1016/j.apsusc.2020.148005

Mustafa, H. , Matthews, D. T. A. , Römer, G. R. B. E., & van der Aa, E. (2021). Method for the Removal of a Coating from a Metal Substrate by Laser Ablation. (Patent No. WO/2021/013939). https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2021013939

Mezera, M. (2020). Picosecond Laser-induced Periodic Surface Structures: Process strategies for metals, silicon and polymers. [PhD Thesis - Research UT, graduation UT, University of Twente]. University of Twente. https://doi.org/10.3990/1.9789036550529

Ur Rahman, N. (2020). Laser based additive manufacturing for hot rolling contacts: Alloy development, laser processing and high temperature tribology . [PhD Thesis - Research UT, graduation UT, University of Twente]. University of Twente. https://doi.org/10.3990/1.9789036549196

Miksys, J., Arutinov, G. , Feinaeugle, M. , & Römer, G-W. (2020). Experimental investigation of the jet-on-jet physical phenomenon in laser-induced forward transfer (LIFT). Optics express, 28(25), 37436-37449. https://doi.org/10.1364/OE.401825

Capuano, L. , Tiggelaar, R. M. , Berenschot, J. W. , Gardeniers, J. G. E. , & Römer, G. R. B. E. (2020). Fabrication of millimeter-long structures in sapphire using femtosecond infrared laser pulses and selective etching. Optics and Lasers in Engineering, 133, [106114]. https://doi.org/10.1016/j.optlaseng.2020.106114

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