We are going to present an iterative Fourier transformation algorithm (IFTA) based computation-method for Phase retrieval of beam splitter elements. The power distribution between the separate beamlets will be controlled via a camera feedback loop in order to create an output distribution which is more closely fitted to the desired distribution than by solely virtual computation. It is taken into account, that by doing so the computation time will rise. Furthermore, we will show some parallel micro structuring examples with femtosecond laser beams utilizing this algorithm. All experiments will be conducted with imaging close to the resolution limit.
A. Kratsch, F. Ehrenberg, A. Engel, and S. Weißmantel, "Using a camera feedback loop for phase retrieval in an iterative Fourier transform algorithm to calculate beam splitter phase gratings for parallel laser microstructuring," Proc. SPIE 10519, Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXIII, 105190D (Presented at SPIE LASE: January 29, 2018; Published: 14 December 2018); https://doi.org/10.1117/12.2288372.
Conference Presentations are recordings of oral presentations given at SPIE conferences and published as part of the proceedings. They include the speaker's narration with video of the slides and animations. Most include full-text papers. Interactive, searchable transcripts and closed captioning are now available for 2018 presentations, with transcripts for prior recordings added daily.
Search our growing collection of more than 16,000 conference presentations, including many plenaries and keynotes.