Chapter 14
Homemade Optical Elements
All this time the Guard was looking at her, first through a telescope, then through a microscope, and then through an opera-glass.
Lewis Carroll
Through the Looking-Glass
If you want to create holograms for display rather than as part of a scientific research project, you don’t have to spend large sums on components of high optical quality. As the initial diameter of a laser beam is so small, it uses only a very small part of any optical device such as a mirror or beamsplitter, and cheap components will produce perfectly satisfactory holograms. Some of the optical devices you need may well be lying in a cupboard full of photographic (or nonphotographic) junk. Everything described in this chapter, you can ...
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