Student: Jelínek Šimon
Supervisor: Mgr. Jaromír Chalupský, Ph.D., FzÚ AV ČR
ConsultantDoc. RNDr. Jan Wild, CSc., Ing. Tomáš Burian, Ph.D., FzÚ AV ČR
Status: Assigned
Abstract:
A rigorous knowledge about the spatial profile of a real laser beam represents an indispensable part in a vast majority of laser-matter interaction experiments, especially, if nonlinear interaction phenomena are under study. Efficient methods of ablation and desorption imprints [1] in solid-state targets (see Fig. 1) were developed for an accurate characterization of intense focused beams of femtosecond X-ray lasers [2-4]. The goal of this doctoral thesis is to expand imprinting methods towards long-wavelength spectral range (IR/vis) and longer time-scales (ps, ns). A detailed investigation of material response to laser radiation of varied parameters should lead to a development of new imprinting targets. While the imprinting methods reliably recover the spatial intensity profile, the phase of the beam can be obtained with use of phase retrieval algorithms [5]. The full description of a general non-Gaussian laser beam, however, requires an implementation of partial coherence which significantly influences the beam propagation in space. A good grasp of this nontrivial issue is another goal of this thesis. Advanced methods of beam characterization will be involved in a new AbloCAM project aimed at automatization of ablation imprinting methods employing approaches of artificial intelligence. The development of the AbloCAM device also belongs to tasks of the thesis.
References
[1] J. Chalupský et al., “Spot size characterization of focused non-Gaussian X-ray laser beams,” Opt. Express 18, 27836 (2010).
[2] D. Attwood, Soft X-Rays and Extreme Ultraviolet Radiation: Principles and Applications, Cambridge University Press, Cambridge 1999.
[3] P. Schmüser, M. Dohlus, J. Dohlus, Ultraviolet and Soft X-ray Free-electron Lasers: Introduction to Physical Principles, Experimental Results, Technological Challenges, Springer Tracts in Modern Physics Vol. 229, Springer, Berlin Heidelberg (2008).
[4] J. Chalupský, Charakterizace svazků rentgenových laserů různých typů, doctoral thesis, FNSPE CTU, 2012.
[5] J. Chalupský et. al, “Imprinting a focused X-ray laser beam to measure its full spatial characteristics,“ Phys. Rev. Appl. 4, 014004 (2015).