Geometrical phase element research, development and application to material processing

The geometric phase elements penetrate into various applications of laser radiation due to ability to transform the initial Gaussian intensity distribution beam into the desired special intensity profile or to a beam with specific propagation properties. The main subject of this study is the geometric phase element. There are many technologies to manufacture them however in order to achieve better efficiency and flexibility the research is needed to reduce parasitic effects. The project aim is to refine the production technology by reducing the scattering effects, reducing the lattice absorption, increasing the efficiency and seeking to control both parameters of the element, not only the polarisation rotation but also the delay between the different polarisation waves. By mastering this technology, we will be able to write any diffraction pattern of interest and create a high efficiency beam transformer. Efforts will be made to develop new ones and to refine existing elements that will allow them to be used in a variety of applications ranging from low power systems such as imaging, probing and reaching high-power applications such as material processing by damage, melting or evaporation. The use of non-Gaussian beam intensity distribution result in a variety of additional effects that can generate additional material tension, decomposition or selective material removal processes that are important not only to industrial application but also in various scientific laboratories. These studies are very relevant to ensure the highest quality, speed and efficiency of the object being processed. The nature of the work can be only experimental (to record the elements of the geometric phase, to improve their manufacturing technology, to analyse the transformed beams and the effects produced by processing the materials) or in synergy with numerical simulation of reshaped beams propagation not expelling geometric phase element design.
For more information, please contact the theme supervisor V. Jukna.