Giving to CREOL CREOL, The College of Optics & Photonics

Seminar: "Thermo-optical and dispersive effects in laser materials processing" by Tobias Bonhoff

Thursday, February 8, 2018 3:30 PM to 4:30 PM
CREOL Room 103

Tobias Bonhoff
RWTH Aachen University, Germany


The first part of the talk entitled “Thermo-optical effects in optical systems for selective laser melting” will discuss thermal effects that are caused by contaminated protective windows. Therefore, a model based on the coupling of finite element analysis and ray-tracing is used. First results for the transient focus shift in dependence on the scanning strategy will be presented.

In the second part of the talk “Dispersive effects in optical elements for shaping ultrashort laser pulses”, the speaker will present how dispersion impacts the shape of ultrashort laser pulses. Especially, selective laser-induced etching (SLE) is influenced by a pulse front tilt (PFT) which is caused by dispersion. Furthermore, experimental approaches to measure and to compensate for a PFT will be presented.


Tobias Bonhoff is a doctoral student at the Chair for Technology of Optical Systems at RWTH Aachen University (Germany). He received his MSc degree in physics from the RWTH Aachen University in 2014. During his Master studies, he completed an internship in the field of laser materials processing at the Townes Laser Institute in the group of Ilya Mingareev. His current research focuses on the multi-physical modeling of thermal effects in optical systems. Furthermore, he investigates dispersive effects of ultrashort laser pulses.

For additional information:

Ilya Mingareev

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