Keyless holographic lock

摘要: A keyless holographic locking device that uses a matched optical filter to store in form of hologram unique identificaton such as fingerprint an authorized user, source coherent light provides the illumination, and input element for providing angle-invariance possessing transparent window against which user places rotates same fingerprint, registering correlation signal between stored presented generate unlock when, only if, positive exists fingerprints. two-stage device, using generalized wherein additional information authorization is reference beam during preparation said filter, second-stage also performed register second identification by user.