Chapter 1
What Is a Hologram?
“I’m afraid I can’t put it more clearly,” Alice replied very politely, “for I can’t understand it myself, to begin with …”
Lewis Carroll
Alice in Wonderland
To the physicist, a hologram is a record of the interaction of two mutually coherent light beams, in the form of a microscopic pattern of interference fringes. To the well-informed layperson, it is a photographic film or plate that has been exposed to laser light and processed so that when illuminated appropriately it produces a 3D image. To the less well-informed, it is just some kind of 3D photograph. But to the majority of the population, it is any form of 3D or even 2D image that appears to hang in the air. In this book, we are concentrating on the recording ...
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