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Abstract
The concept of digital holographic recording is illustrated in Fig. 3.1a (Schnars, 1994; Schnars and Jüptner, Appl Opt 33:179–181, 1994). A plane reference wave and the wave reflected from the object interfere at the surface of an electronic sensor array (e.g. Charged Coupled Device CCD, or Complementary Metal Oxide Semiconductor CMOS). The resulting hologram is electronically recorded and stored in a computer. The object is, in general, a three dimensional body with diffusely reflecting surfaces, located at a distance d from the sensor (measured to some representative plane). This is just the classical off-axis geometry of photographic holography save that the recording medium is an electronic sensor array rather than photographic film.
Fig. 3.1
Digital Holography. a Recording, b Reconstruction with reference wave ER,c Reconstruction with conjugate reference wave \( E_{R}^{*} \)
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