Fulgide is well-known as a thermally irreversible organic photochromic compound [1,2]. It is one of the important materials in the field of optical signal processing and optical storage. Focusing on the holographic storage applications of 3indoly-benzylfulgimide/PMMA film, in this chapter include the following themes. In section 2, first the Fulgide, photochroism and photo-induced anisotropy ar...