Reflection hologram recording in DuPont HRF-800X071-20 photopolymer films has been demonstrated by use of pulsed laser exposure with pulse lengths of 25 ns. An expected weak reflectance of the recorded mirror holograms could be significantly increased by preillumination. Although pulsed preillumination enhanced only the reflectance, continuous incoherent preillumination significantly increased both the diffraction efficiency (which reached ~80%) and the sensitivity (which reached an increase of ~100 times, thus approaching the sensitivity of cw recording). The results are compared with those for hologram recordings obtained with cw exposure under the same processing conditions. Spectral absorbance curves of recorded holograms are presented, and possible mechanisms of hologram formation are discussed.

We present results of investigations of modern cw-laser diodes, emitting in the red spectral range from 635 nm to 670 nm with power from 5 mW to 100 mW for recording and reconstructing reflection and transmission holograms. High-quality reflection holograms were recorded in silver halide materials and in DuPont photopolymers. We demonstrated a brilliant reconstruction of transmission holograms with a depth of image up to 3 m.

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We report an experimental investigation of recording of slanted fringe holograms in DuPont HRF-800X071-20 photopolymer film under pulse exposure. An initially weak polymerizalion ability was improved Significantly by using incoherent preillumination'. The lineshape and position ofspectral absorbance curves are discussed for a wide range of slant angles

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