Covert Laser Readable (CLR) Image

An image in a hologram that is invisible to the naked eye and cannot be viewed with a microscope. It is visualized in laser light with the help of special devices. It is formed when recording a hologram image using the method of 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 1 micron in depth. A laser beam, directed perpendicularly to the surface of this area, is reflected from microrelief elements and forms an image on the device screen.

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