Holograms, or three-dimensional (3D) images of objects, are not only attractive to look at but also have remarkable properties. However, the process of making a holographic image is a lengthy one. Now, scientists at the Risoe National Laboratory in Denmark have developed a photo-sensitive polymer in which a blue-green laser light can record a holographic image almost instantly. The best part of this new device is that like Polaroid cameras used in still photography, these images do not require any chemical processing. The applications for this instant holographic device range from optical switches to 3D movies ( Applied Physics Letters , May 24, 1999).
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