Ultra-Fine Grain
Fine Grain
DCG
TECHNICAL PRODUCT SPECIFICATIONS AND SALES INFORMATION BROCHURE JANUARY 2001
Emulsions
For
Holography
Acknowledgements
Geola is grateful to Sergey Vorobyov for the technique of latensification. We would
also like to acknowledge the work of Hans Bjelkhagen and Nicholas Phillips, on which
much of the chemistry listed in this brochure is based, as well as that of Bernadette
and Ron Olson for the technique of colour-shifting by D-Sorbitol.
Characteristic curves of fine-grain
red (PFG-01) and green (VRP-M)
emulsions, showing spectral
sensitivity versus wavelength, are
shown in Fig.1. The VRP-M
optical sensitivity (to CW radiation)
is seen to peak at aproximately 75
mJ/cm2 and that of the improved
PFG-01 (to CW radiation) at
approximately 80 mJ/cm2. (This
improved batch will be comercially
available in the second quarter
of 2001). Fig.2 shows the
optical density after exposure
by CW radiation and after
development versus energy. Grain
size characteristics for the
VRP-M and PFG-01 emulsions
are shown in Fig.3.The diffrac-
tion efficiency versus exposure
f
o
r
reflection holograms recorded on
PFG-01 (using a CW laser) and
on VRP-M (using a pulsed laser)
is presented in Fig.4. The
maximum diffraction efficiency is
seen to be >45% for both
emulsions. Material lifetime is
more than two years.
The VRP-M and PFG-01
emulsions may be used equally
well with pulsed lasers and with
CW radiation. In the pulsed la-
s
e
r
radiation case the emulsion
should be post-sensitized with the
technique of latensification. The
Table 1: List of Available Holographic Materials
GEOLA
Geola
is
the
international
coordination office for
the
distribution of Holography films and
plates.
Geola actively participates in the
origination of new products and in
primary product testing.
Geola certifies holography
materials through its own in-house
quality control programme.
Geolas network for the sale,
wholesale and distribution of
holography materials is currently
the largest such distribution
network worldwide