Volume holographic storage and animation based on addressing with an elastomer phase mask

Optics Communications Volume 245, Issues 1-6, 17 January 2005, Pages 75-83 doi:10.1016/j.optcom.2004.10.005 | Cited By in Scopus (4) Raphael A. Guerrero, National Institute of Physics, University of the Philippines, Diliman, Quezon City, Philippines Department of Physics, Ateneo de Manila University, Loyola Heights, Quezon City, Philippines

Received 27 April 2004; revised 10 August 2004; accepted 4 October 2004. Available online 13 October 2004.

A novel technique for phase-multiplexed holographic storage is reported. Phase codes for recording individual images are generated with an elastomer mask fabricated from silicone. The mask is imprinted with a random phase distribution by using a mold with a nonuniform surface profile. By displacing the elastomer from equilibrium, the optical path length traversed by each point on the reference beam wavefront can be altered, creating a unique phase address for a particular amount of strain. Images are stored in a photorefractive crystal at 0.21 mm (0.22% strain) intervals. Phase selectivity of different masks is variable, with a minimum strain sensitivity for sufficient phase mismatch at 0.06%. Prestrain of the elastomer at 7.1% leads to lower phase selectivity at small strain intervals. Holographic animation at 8–25 frames per second is demonstrated for two sequences at recording intervals of 0.105 and 0.21 mm displacements.

Keywords: Volume holograms; Hologram recording and read-out methods; Elastomeric polymers PACS: 42.40.Pa; 42.40.Ht; 83.80.Va

Source: Science Direct