Laser-personalizable security articles include a multi-layer security document and an optically transparent processing tape. 2 \u03bcm and less than about 3 \u03bcm. A camera positioned above the substrate captures two images thereof, one using the first light source and one using the second. The first slider and the second slider are overlapped relative to each other in the vertical direction. The control circuit is coupled to the wired transmission member, receiving the sensing signal and generating a control signal.