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25 holography lessons

Glossary FAQ


12. Hologram presentation

Final lesson of this section is devoted to presentation of the hologram for audience. Basic operations are: painting, cutting, cleaning, mounting into frame and illumination of the prepared hologram.
Emulsion layer of the hologram isn't strong and can be damaged by accidental touch and hence it should be protected - painted using black color or sealed up by black pressure sensitive adhesive (self-adhesive film). Black color of the protective cover makes the hologram opaque. This increases image contrast and allows using back parts of any color for mounting the hologram into frame.
Please use quick-drying paint in sprayer for painting motor-cars. This paint gives more uniform cover and it is more convenient for use. Sometimes there is some little amount of water in aerosol cans with low-quality paint. Before painting, direct the jet of paint from the new sprayer at a piece of paper or cardboard. If color bubbles some water can be contained in it. At first try to paint a rejected hologram. If red spots and stains remained on the hologram after full color dry-ing up it means that there is some water in the color and it should be replaced. For getting a dense non-transparent cover it's desirable to put successively two color layers. When humidity in the room is increased then after putting even a good color the image on the hologram also turns red (moisture from air is partially carried along by a color jet) but after full color drying up which can last several hours the image color is restored completely.
Protection of the hologram using black pressure sensitive adhesive is more preferable because a film is more prefer than a color layer and also the room shouldn't be ventilated. The film can be applied manually or using a photo-roller for photo glossing. By sticking on the film you should be very accurate and seek that there appear no air bubbles under the film. The point is that it's practically impossible to remove these bubbles after completion of the film sticking on. The bubbles can also appear on small particles, which remained on the hologram surface so try again to remove all small particles from the hologram surface. You should gain some experience in order to stick on the film with good quality. Please train to do this in advance using ordinary glass plates. After sticking on the film cut the outstanding edges with the help of a sharp knife.
After protection of the emulsion layer you can proceed to the following operation - cutting off the hologram. Dimensions of the hologram do not necessarily match sizes of the frame in which the hologram should be mounted. For example, not exposed edges of the hologram can prevent this. For cutting off the hologram a glass cutter, ruler and of course a deep experience of glass cutter using. As a last resort you can address yourself for consultation to the shop where window glass is sold. Cut off the hologram using the dimensions, which are 1-2 mm less than the frame sizes. In order not to cut hands please put on rubber gloves.
Immediately before mounting the hologram into frame it's necessary to wipe its glass surface since traces of alcohol drying up, finger-prints and so on can remain on it. For doing this use household liquid for glass cleaning. At first wipe the hologram clean with the help of the cotton wool piece wetted in liquid and then wipe it dry using a clean rag. Don't allow liquid to get on the emulsion side - the fact is that it can penetrate even through the painted layer and damage the hologram.

The last operation - mounting the hologram into frame. Accurately insert the hologram into frame, close it by a cardboard back cover and fix it with the help of small nails and special clamps. Now the hologram is ready (see photo).
In conclusion some words about illumination of the hologram. Illumination of the hologram is an extremely important moment for getting a good quality three-dimensional image. Lighting source should be bright and have the least possible dimensions. Only then the image restored by the hologram will be sharp over the whole volume. For illumination of the hologram can't be used: daylight lamps, lamps with big shades, chandeliers with several lamps, sun light (when sun is closed by clouds), and so on. At present optimum solution consists in using halogen lamps with supply voltage of 12 Volts. They have a long service life, small sizes and can concentrate light into narrow space angle due to presence of the reflector. Our experience shows that for domestic conditions a halogen lamp with power of 35 Watt and the illumination angle of 24 degrees is quite appropriate. For demonstration of the hologram at the exhibitions where bright surrounding lighting exists it's more preferable to use halogen lamps with power of 50 Watt and with the space angle of 10 degrees. The hologram should be illuminated under the same angle under which the reference beam fell by the hologram recording (see photo). Optimum distance from the halogen lamp to the hologram center is equal to 30-40 cm for small holograms (up to 18x24 cm) and 60-80 cm for holograms of bigger format (up to 28x40 cm). The lighter can be mounted on the wall independently of the hologram or can be fixed directly on the frame. Concrete way is determined by your wishes and abilities. -->