Enhancement of color, bandwidth and diffraction efficiency
of volume reflection holograms recorded in photopolymers is
discussed and demonstrated. A method of increasing.the bandwidth
while shifting the center frequency toward the red is given for
special cases in two well known photopolymers. Computer
modelling gives clues to what has happened to the structures in
some cases. Many more adjustment recipes than those given appear
to be possible and are likely to work as well or better.