As it is well known today, the advent of lasers revolutionalized the scientific optical recording technology. The most popular in this respect is holography — a technique made pratically possible as a consequence of the appreciable coherence length of the laser light  (*). It is of interest to note, however, that such exploitation of the advantages accrued by the use of lasers as light sources is by no means associated with the introduction of new principles. The fundamentals of holography, for instance, have been laid down by Gabor  long before laser was discovered. Thus the real nature of the revolution brought about by the use of lasers as light sources for optical observations is associated primarily with the improvements they introduced to experimental techniques whose basic features were known before.
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