INTEGRAF--Simple Holography

Simple Holography

The Easiest Way to Make Holograms

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5. MAKING A PANORAMIC TRANSMISSION HOLOGRAM

Transmission holograms offer many advantages over reflection holograms. For example: (1) the object or scene can be much bigger than the holographic plate; (2) when illuminated with the diode laser, the entire virtual image is sharp; (3) the real image can be projected onto a screen using a laser pointer; (4) it is more tolerant of vibration during recording, so that film, instead of the more expensive plates, can be used; and (5) two or more “channels” of independent images can be recorded on the same plate or film. For example, after the first exposure, turn the plate or film upside down and exposure again with a different object. Each exposure should be one-half the duration of one full exposure.

The figure below shows a “sandbox” system set up for recording a panoramic transmission hologram on a strip of film with approximate dimensions of 4"x5" (102mm x 127mm). The film is Slavich PFG-01 (which must be processed with JD-2 or JD-3) and can be cut (in a darkened room, of course)into any smaller sizes using scissors or paper cutter. One can also use a holographic plate. PFG-01 and PFG-03M both make great holograms, but PFG-01 is especially good for transmission holograms..

The film is clamped between two larger glass plates and stuck into the sand. One side of the spreading beam serves as reference beam and the rest illuminates the object(s). Since air is trapped inside the glass plates and escapes slowly, the film sandwich will have movement over several minutes. It is advisable to squeeze out the air by pressing the sandwich between two flat surfaces. Alternatively, just place the sandwich in position and wait 5 to 10 minutes before exposure. Cover the film and keep any stray light from fogging it during this time.

The exposure time is approximately 30 to 60 second (PFG-01). The processing procedure for the film, using JD-2 or JD-3, in accordance with instructions that accompany the kits.

For more details on making transmission holograms, see our article "How to Make Transmission Holograms".

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