Characterization of the DuPont photopolymer for three-dimensional holographic storage
DuPont's HRF-150 photopolymer film is investigated for use in three-dimensional holographic memories. Measurements of sensitivity, hologram persistence, the lateral spread of the photoinitiated reaction, and the variation of diffraction efficiency with modulation depth, spatial frequency and tilt angle, and intensity are reported. We observed that the diffraction efficiency of the HRF-150 photopolymer for a given exposure decreases with increases in intensity and grating tilt angle. The holograms were nondestructively reconstructed for long periods of time at room temperature. The photoinitiated reaction spread less than 100 µm over a period of 16 h.
© 1994 Optical Society of America Received 23 November 1993; revised manuscript received 7 February 1994. We thank Steve Zager of DuPont and Geoffrey Burr for their helpful discussions. This work was funded at the California Institute of Technology by the U.S. Air Force Office of Scientific Research.