Holographic stamps, also known as "laser holographic stamps", like to be called "laser stamps" in Hong Kong, Macao and Taiwan. According to the annotation of "Holographic Materials" in China Philatelic Dictionary, holographic materials are photosensitive materials for holographic photography. The principle of holography is that laser is used as the illumination source, and the light emitted by the light source is divided into two beams, one of which is directly directed at the photosensitive plate, and the other is emitted by the object to be photographed and then directed at the photosensitive plate. The superposition of two beams of light on the photosensitive film produces interference and forms different phases, thus effectively recording the image information of the whole object, which has a strong three-dimensional effect. This kind of stamp usually sticks a holographic picture on a paper base, and the pattern part is a holographic image. The face value and memory are still printed on the paper base in order to stand out.

The world's first holographic stamp was issued by Austria in June 1988 65438+ 10/8 to commemorate the World Trade Conference held in that country. The stamp image is made by laser holography, and the middle cube has an A. The hologram contains a plane figure of an Austrian export product trademark and a three-dimensional image of a cube with the words "Austria" and "Made in Austria". The image has a three-dimensional effect. The face value of the stamps is 8 shillings, and the catalogue number of Scott stamps is A809.

If you receive a real envelope with a holographic stamp, don't soak it in water. Because then the hologram will fall off the stamp and become blurred after a long time, so it is best to keep it with the envelope.