What is hologram?

holograms are photographic images that are three -dimensional and seem to have depth. Holograms work by creating an image composed of two overlapping two -dimensional images of the same object that can be seen from different reference points. Holography requires the use of light of one accurate wavelength, so you need to use lasers. In reflective holograms, a type of holograms is used to take the object of the object, which can be seen in normal light, two laser beams and a photographic board.

The two laser beams used in holography pass through the rays of beams that spread laser light as a flashlight. The coherence of the beam is lost, but remains the exact wavelength. One beam illuminates the object from the side. The second beam, known as the reference beam, passes through the photographic board and hits an object of the front, similar way to the conventional camera takes 2-D image. Reflective light from the reference beam is left by a picture or hologram naphotographic board, but the oneThe light reflects the object from the side beam. The result is a photographic board that registers two pictures simultaneously and creates a hologram. The brain combines them into a three -dimensional image. The hologram produces the same effect artificially.

During development, the hologram is printed on a set of ultra -nicked curved silver boards that are made to make diffraction light. Diffraction is what a prism does-make white light with more wavelength to each specific wavelength. When the white light hit the silver boards, the reflections are unleashed into every particular color and create two offset images formed from colors that roughly reflect what the original object looked like. The result is a three -dimensional image, a hologram. The hologram consists of an interference pattern between two original pictures.

Because copying hologram is extremely difficult, holograms are often used for security purposes on credit kartách.