<title>Color holography: present state of the research activities at ISL</title>

Abstract

Some experiments concerning color holography and color holographic interferometry have been conducted at ISL. In a first stage, static holograms have been recorded with c.w. lasers in PFG-03C silver-halide panchromatic holographic plates. Color holographic interferometry is at present experimented and developed. Quantitative measurements by double-exposure holography are not possible. An example, on a cantilever plate, showing the achromatic fringe, is visualized on the reconstructed image. Quantitative deformations of the plate are presented. An experimental set-up designed for the real-time holographic interferometry of phase objects is also presented. A video film, recorded at 25 frames per second and relating laboratory experiments on some fluid mechanics flows, is shown. New difficulties occur when these experiments are carried out by using pulsed lasers. Our first tests on this technique are presented. Three pulsed lasers have been used: a ruby laser, a frequency doubled YAG laser and a frequency doubled titanium-sapphire laser. Ruby and YAG lasers, delivering red and green waves, are commercially available. A special frequency doubled titanium-sapphire laser, built as ISL produces the blue line. Preliminary results are presented and discussed.