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Comsol simulation of high field THz focusing

Date Do, 08.05.2014 - Do, 08.05.2014
Time 10.15
Speaker Yannik Waeber, Institute of Applied Physics, University of Bern
Location Universität Bern, Institut für Angewandte Physik, Gebäude exakte Wissenschaften, Hörsaal B116, Sidlerstrasse 5, 3012 Bern
Program To facilitate nonlinear THz experiments it is essential to reach the highest possible focused intensities, i.e. the smallest possible spot size. The THz pulses are single-cycle pulses, therefore, they cover a rather large spectral bandwidth (100μm - 3000μm). This has two important consequences. First, the dimensions of the optical elements are comparable in size to the THz wavelengths and, second, any achromatic element will have a negative effect.
Through dedicated COMSOL simulations we investigate a number of important questions:
1) Is the paraxial approximation, e.g. Gaussian beams, still a useful description?
2) Can we assume an almost linear polarization in the focal plane?
3) What is the best focusing system given the different THz sources used in the lab?
4) Focusing versus imaging.
5) How careful do these systems have to be aligned?
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