Abstract
Ultra intense laser chains exhibit large amounts of spatial and temporal aberrations which degrade the quality of the beam delivered by the source. These aberrations arise from the thermal lensing due to the efficient pumping of the gain media. Also, the aberrations of the optical components as well as the group delay dispersion effects due to ultra short pulse propagation in a femtosecond laser are major parameters which degrade the spatial and temporal properties of the beam. In such conditions the beam spot size after focalization and the pulse duration are far from their ultimate Fourier transform limit (1-2-3). Since now most of the applications require optimum source brightness and ultra high peak power, it is of particular importance to introduce new programmable optical components which can compensate for the spatial and temporal aberrations of the chain (4, 5). The technology developed at TH-CSF/LCR consists in using an optically addressed liquid crystal spatial light modulator (OASLM) which exhibits very interesting characteristics for the control of temporal and spatial signals. After the presentation of the device operating principle, technology and performances, we highlight the following applications: Correction of the spatial aberrations of a 100 TW laser. Correction of the group delay dispersion in a femtosecond laser. Dynamic holography for image amplification.
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