A device for optically storing and retrieving information incorporating a cadmium fluoride crystal. Using focused ionizing radiation, patterns can be formed in the crystal by the creation of color centers and/or intrinsic luminescence quenched areas. The stored information can then be retrieved by irradiating...http://www.google.com.tw/patents/US5581499?utm_source=gb-gplus-share專利 US5581499 - Micro information storage system
