Requirements for hologram construction

Holography has in the last two years undergone a tremendous resurgence. The laser has contributed immeasurably to this, through the remarkable coherence of its light, which permits previously performed experiments to be carried out with relative ease, and in addition allows the performance of experiments which were hitherto hardly conceivable. Old experiments have been repeated with vastly improved results, and the new interest has given rise to new ideas with exciting promise.