The authors present a comprehensive tutorial on building and aligning a 10-plane programmable light converter (MPLC) using a single spatial light modulator (SLM) and common optical components.
The MPLC setup consists of an SLM, a dielectric mirror, and a prism, allowing the light to reflect between the SLM and the mirror 10 times, with each reflection corresponding to a phase mask plane. The authors describe a three-stage alignment procedure to precisely position the phase masks on the SLM, achieving single-pixel accuracy.
The first stage involves rough alignment of the first and last five planes to get the light through the MPLC. The second stage focuses on fine alignment, where the authors use the programmability of the SLM to image the first plane onto the camera and precisely locate the center of the beam on the SLM. This process is then repeated for the subsequent planes, with the center of each plane being defined relative to the previous one. Finally, the authors discuss further corrections for optical aberrations in the setup.
The authors emphasize the importance of this precise alignment, as the MPLC is highly sensitive to phase mask positioning errors on the order of a few pixels. They also note that the routine alignment can be performed relatively quickly, as it only requires adjusting the external camera and displaying phase masks on the computer-controlled SLM.
The authors hope that this detailed guide will help other researchers quickly adopt and adapt MPLC technology for their own experiments, as the setup uses common optical components and a single SLM, and the phase mask calculation algorithms are publicly available.
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by Ohad Lib, Ro... klo arxiv.org 10-01-2024
https://arxiv.org/pdf/2409.20039.pdfSyvällisempiä Kysymyksiä