HARMAN technology's new holographic emulsions; red sensitive and green sensitive assisted by smaller grain sizes,
novel sensitization and coating technology have been shown to achieve high diffraction efficiencies and narrow band
reconstruction capabilities. Authors demonstrate processing optimizations and material behavior characteristics for both
narrow band and broadband with controlled playback frequency.
HARMAN technology's new holographic emulsions; red sensitive and green sensitive assisted by smaller grain sizes,
novel sensitization and coating technology have been shown to achieve high diffraction efficiencies and narrow band
reconstruction capabilities. Authors demonstrate processing optimizations and material behavior characteristics for
Transmission image Masters as well as Holographic Optical Elements (HOE's).
This paper is useful for teaching holography workshops in classrooms as well as in makeshift locations such as museums, businesses, and homes. The target audience is very general, young children to adults of any profession, al of whom have no prior experience in making holograms. A typical number of participants is twenty-five, but can vary depending on space and personnel availability. A central original contribution of this paper is the discovery of a new chemical processing regime for the Slavich PFG-03M holographic plates. These silver halide plates have the highest resolution of its kind and some of the world's best holograms have been recorded on it for several decades. Due to its low sensitivity and long developing time, this material has been excluded form use in workshops. Our new processing regime JARB has the following advantages: It (1) increases the sensitivity of PFG-03M emulsion ten-fold without sacrificing resolution; (2) hardens the emulsion during processing without significant shrinkage; (3) has a ten- to twenty-second development time; (4) is quick drying using squeegee and warm air; and (5) allows the finished hologram to be viewable with laser or incandescent light. Other advantages of JARB are (1) low toxicity, (2) low volatility, (3) non-staining, (4) low cost, and (5) long shelf life.
Bright and scatter-free reflection holograms of about 4 cm. diameter
can now be made in DCG using a 10mw HeNe laser and a one minute
exposure. This breakthrough in DCG technology comes from the
discovery of a new electron donor compound (tetramethylguanidine)
used in conjunction with methylene blue. Other dyes will allow much
greater sensitivity to green light than normally exists in DCG. This
can lead to both easier fabrication of HOE's and full color DCG
holograms. Furthermore, the high alkalinity of the system allows the
unexposed coated material to have an effective lifetime at room
temperature of weeks rather than hours. It has a much lower quantity
of hexavalent chromium than normal unexposed DCG, thus making its
toxicity comparatively much lower.
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