Polarization-Controlled Nonlinear Computer-Generated Holography
Abstract
Dynamic phase-only beam shaping with a liquid crystal spatial light modulator is a powerful technique for tailoring the beam's intensity profile or wave front. While shaping and controlling the light field is a highly researched topic, dynamic nonlinear beam shaping has hardly been explored so far. One potential reason is that generating the second harmonic is a degenerate process as it mixes two fields at the same frequency. To overcome this problem, we propose the use of type II phase matching as a control mechanism to distinguish the two involved fields. We experimentally demonstrate that arbitrary intensity distributions can be shaped in the frequency-converted field at the same quality as for linear beam shaping and with conversion efficiencies similar to the case without beam shaping. We envision this technique as a milestone towards beam shaping beyond the physical limits of liquid crystal displays, i.e. facilitating dynamic phase-only beam shaping in the ultraviolet spectral range.
Cite
@article{arxiv.2301.10093,
title = {Polarization-Controlled Nonlinear Computer-Generated Holography},
author = {Lisa Ackermann and Clemens Roider and Kristian Cvecek and Nicolas Barré and Christian Aigner and Michael Schmidt},
journal= {arXiv preprint arXiv:2301.10093},
year = {2023}
}