Holographic Optical Elements (HOES) In Dichromated Gelatin (DCG):Progress

In the early seventies a number of researchers noted that DCG was in some cases an ideal material for HOE fabrication. B.J. Chang and Andres Graube both did extensive characterizations of the material and many others have contributed since then. A large number of HOES have been made since then and a few are in industrial or commercial machines already. It would take a very long time to describe all the variations and applications that have been reported. In this paper we discuss only a few applications where non-standard practices may have been employed in meeting the design objectives. The emphasis is on the fabrication solutions and on any unusual or previously thought unlikely results.