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We demonstrate a device capable of controlling simultaneously all the degrees of freedom of a light beam (spatial/polarisation and spectral/temporal, 38,000 spatiotemporal modes are fully controlled through the C-band), after propagation through a multimode optical fiber that adds extra mode coupling. For this, we have combined a polarisation-resolved multi-port spectral pulse shaper (control of 1D spatial/polarisation and spectral modes) and a multi plane light conversion device (conversion 1D to 2D spatial/polarisation modes). The ability to deliver accurate volumetric light fields could be applied to control both linear and non-linear optical processes.
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Mickael Mounaix, Nicolas Fontaine, David Neilson, Roland Ryf, Haoshuo Chen, Juan Carlos Alvarado-Zacarias, Joel Carpenter, "Arbitrary vector spatiotemporal light field generation," Proc. SPIE PC12017, Complex Light and Optical Forces XVI, PC120170E (9 March 2022); https://doi.org/10.1117/12.2613611