Optimized focal intensity distributions with freeform optics for material processingThursday (25.06.2020) 11:30 - 11:50 Room 3
The number of applications in material processing that inquirer focal intensity distributions apart from Gaussian shape is growing fast. Of special interest are hereby not only top-hat or donut distributions but also non-rotationally symmetric distributions like squares or ellipses. We present refractive, freeform beam shaping elements to achieve such focal distributions. Moreover, those elements are capable of creating patterns in the focal region with 3x3 or 4x4 spots. The size of all focal distributions is tunable with the NA of the focusing lens employed.
The simulation results are compared with measured intensity profiles to show the good agreement of the results. Furthermore, first single spot experimental results on stainless steel demonstrate the varying impact of the different intensity distribution on the material interaction. Since the beam shaping is all low-dispersion, refractive this opens up new possibilities for material processing, especially, with ultrashort laser pulses.
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