10 Holographic Interferometry
10.1 Introduction
Holography allows us to use interferometry, with its very high precision and sensitivity, to study surfaces which are not optically smooth as required in conventional interferometry. For this reason, holographic interferometry (HI) has matured into a powerful, widely applied technique driven by industrial requirements for new materials with minimum waste in their production, processing, and reprocessing, and the manufacture of components made from them. Other advantages are the whole field and non-contact nature of the method, the latter facilitating the study of delicate materials. The sensitivity of holographic interferometry using the wavelength of light as the ...
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