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How to make a Hologram

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Hello, my name is Swann Rack and this is guide how to make a DCG Hologram, DCG standing for

dichromate gelatin hologram. Enjoy.

Step 1. Checking the glass:

The first step when making a hologram is to check the glass. Glass is made in a factory

by pouring molten glass on a bed of molten tin. Glass has a lower density than tin, so

it floats on top. That’s why it’s called float glass. The floating glass forms an almost

perfectly flat surface on the molten tin. Molten tin is also colder than molten glass.

So glass cools down when it touches the tin. New glass is constantly poured at the beginning

of the production line, so the older glass is getting pushed forward. This pushing motion

forms a pattern of parallel lines in the glass. You can make this pattern visible if you shine

an expanded laser beam on the glass at a very steep angle and look at the light passing

through. Depending on the orientation of the glass, you will see one of two different patterns. You

will either see a pattern of parallel lines or when you turn the glass 90° degrees you

will see a wood grain pattern. To get the optimal hologram, the glass should be oriented

so you see the "parallel lines" pattern. If the correct orientation of the glass is

neglected, there will be scatter in the final hologram. With a pen you can draw an arrow

on the glass, indicating the direction of the pattern. When you cut the glass a little

longer in the vertical size than in the horizontal, you will be able to remember in which direction

the lines were running.

Step 2. Cutting the glass:

I use standard float glass for making holograms. Optical-grade glass doesn’t yield better


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