15 Holography and the Behaviour of Light
15.1 Introduction
We saw in Section 13.6.1 how we can restrict the depth of field in digital holography by using a broadband light source. Such a source has a correspondingly short coherence length, and therefore the range of object size, or depth which may be recorded in a hologram, is thereby restricted. Short coherence length can thus be a distinct advantage in holographic applications where good depth resolution is required.
Similar considerations apply if the light source is pulsed with the physical length of the pulse replacing the coherence length. In other words, the temporal duration of the pulse replaces the average duration of a wave train.
Suppose a single laser ...
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