Abstract
Experimental results concerning the real-time hologram recording
process in dichromated poly(vinyl alcohol) are
presented. Self-enhancement, the increase in diffraction efficiency
of the holographic gratings in the dark after recording, is also
presented. The influence of the recording parameters (pH,
exposure energy, dichromate concentration) on the self-enhancement
gain is shown. Maximum gain was 6, and self-enhancement occurred
during the 3 days following the exposure. The results and a
model for the reduction of chromium ions corresponding to the formation
of the grating are discussed.
© 1999 Optical Society of America
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