Synthèse d'impulsions subpicosecondes et visualisation holographique

Abstract Subpicosecond pulses have been synthesized with a dye laser. The 8000 GHz broadband source corresponds to a temporal resolution of Δt = 1/ Δv = 0.12 ps . The holographic recording set-up proposed by N. Abramson has been used to visualize the light in flight, but the wavelength dependence of the hologram introduces a dispersion in the reconstructed image. Compensation techniques have been applied and an other recording system has been developed. Experimental results of the reconstructed holographic wavefront are presented. The interesting possibility to obtain a reconstruction in white light is compared with the coherent case. The signal-to-noise ratio of the image is discussed. Metrological applications have been outlined.