Wednesday, November 15, 2017
A security mark (an image, symbols or text) which is invisible to the unaided eye and under a microscope. The image is visualized in laser beams with the help of special devices. It is formed when recording a hologram image using the method of the electron-beam lithography. A covert laser readable image is an area on the hologram surface which has specific microrelief of 1 micron in size and less than a micron in depth. A laser beam which is perpendicular to the surface of this area reflects from microrelief elements and forms an image on the device screen. This is visualize at a laser beam of 532 nm (ID cards)
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https://www.tribunalconstitucional.pt/tc/file/Relatorio_PR2021_AndreVentura_vf.pdf?src=1&mid=8303&bid=7012



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