Abstract

Volume holographic architectures in the form of rotating disks [1] or stationary volumes [2] have been demonstrated for data storage. Recently, thin film materials have been developed that are inexpensive, easy to manufacture, can be applied to large glass substrates, and have relativily large dynamic range. An example of such a material is DuPont’s HRF-150 photopolymer [3,4]. A holographic storage system’s density is limited by two parameters – the system’s bandwidth (either temporal or spatial frequency) and the material’s dynamic range. Because of their relativily large dynamic range and limited thickness, the storage density of thin films is limited primarily by the required system bandwidth. This paper describes a method of multiplexing holograms that alleviates the bandwidth limited density problem, and therefore, significantly increases the storage density of thin films.

© 1994 Optical Society of America