Holography is one of the most informative optical methods of the investigation
of spatially inhomogeneous , nonstationary, bright self- luminous
objects. However, most natural objects (plasmas, vapous, liquids, solids,
biological objects, etc.) have a complicated composition and structure,
which are revealed in the specific spectral dependences of the object's
refractive index, absorption, scattering and reflection. This circumstance
requies the development of the polychromatic type of holography, which is
realised with a large number of wavelengths simultaneously, for the diagnostic
of such objects.
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