Ultrafast heating of glasses, how does it look?

PhD defence, Monday 23 January 2017, Lasse Haahr-Lillevang

2017.01.23 | Karen Konradi

Lasse Haahr-Lillevang

Materials such as quartz (glass), sapphire and water are typically transparent to visible light. This, however, changes drastically when the intensity of the light is very strong. In the laboratory this can be acheived by compressing and focusing a powerful laser in ultrashort pulses. Then the interaction between light and the material changes fundamentally and the material obtains almost metallic character. During such a rapid heating the heat exchange with the surrounding material is insignificant, which leads to applications in e.g. precise structuring, cutting and modifying of the material on the micrometer scale. The PhD studies of Lasse Haahr-Lillevang were designed to investigate the extreme conditions under which the energy of the light is transferred to the material, by performing optical experiments and by using numerical models. In addition to having created a deeper insight into the physical processes behind the material changes, a novel feature of these ultrafastly superheated materials have been discovered and described.

The PhD degree was completed at the Department of Physics and Astronomy, Science and Technology, Aarhus University.

This résumé was prepared by the PhD student.










Time: Monday 23 January 2017 at 13.00

Place: Building 1534, room 125, Department of Physics and Astronomy, Ny Munkegade 120, Aarhus University, 8000 Aarhus. 

Title of dissertation: Ultrafast Laser Switching of Dielectrics: Reflectance Transmission and Gain

Contact information: Lasse Haahr-Lillevang, e-mail: lassehl@phys.au.dk, tel.: +45 23904205

Members of the assessment committee: Razvan Stoian, Université de Lyon, Université Jean Monnet, Saint Etienne, France Wolfgang Kautek, University of Vienna, Austria Frank Grundahl (chair), Department of Physics and Astronomy, Aarhus University

Main supervisor: Peter Balling, Department of Physics and Astronomy, Aarhus University

Language: The PhD dissertation will be defended in English

The defense is public. The dissertation is available for reading at the Graduate School of Science and Technology/GSST, Ny Munkegade 120, building 1520, rooms 128-134, 8000 Aarhus C.  

PhD defence
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Revised 25.09.2017