Second configuration: Mass change due to the repulsion force change between the PyC piece placed on a balance pan and the magnet array held above it when its surface is irradiated by a laser beam (green dashed line). (a) Photograph of a setup using a mass comparator Mettler-Toledo AX206. The detailed view in box shows the aluminium block with the mirror placed on the balance pan and the magnet array fixed above the PyC tile (the PyC tile glued on the aluminium block is not visible on the photograph). (b) Example of response in terms of mass after 60 s irradiation for three different laser powers at 1064 nm.