Optical authentication device
Optical element and method for the production thereof
Optical element and method for the production thereof
Optical element and method for the production thereof
Optical feature, in particular for documents of value, and a...
Optical fiber illumination device and inspection apparatus
Optical recording medium and apparatus of judging fake thereof
Optical structure
Optically variable element
Optically variable element and the use thereof
Optically variable security attribute
Optically variable security device
Optically variable surface pattern