Chapter 5
Materials, Exposure, and Processing
You boil it in sawdust: you salt it in glue:
You condense it with locusts and tape:
Still keeping one principal object in view -
To preserve its symmetrical shape.
Lewis Carroll
The Hunting of the Snark
There are two ways in which the interference structure of a hologram can be stored: in a light-sensitive medium in analogue form and as digital data recorded in a computer. In this chapter, we discuss the various light-sensitive media used to store the interference fringe structure permanently and (more briefly) erasable materials. At present, there are four main types of recording material: silver halide emulsion, dichromated gelatin (DCG), photopolymer, and photoresist. The first three groups are ...
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