We designed and manufactured an optical bench to characterize the EUCLID dichroic reflected wavefront at all useful incidences, all polarization states and each wavelength from 550nm to 950nm. The multilayer coating adds indeed some phase effect that vary suddenly in function of the wavelength. The testbed architecture, main functionalities and performances are presented. The preliminary results obtained on the dichroic mirror are compared to some simulations based on an up-to-date model of the multilayer coating.
The constant increase of peak energy on high-intensity lasers necessitates the combined control of the laser pulse (with pulse shapers for temporal characterization) and the wavefront (with deformable mirrors for spatial characterization). Focusing the beam on the target creates space time couplings that were typically neglected until now. We have developed a solution that provides direct, spectrally-resolved wavefront measurements to characterize and quickly diminish those couplings. We will present concrete results on beamlines, highlighting the interest of a high spectral and spatial resolution system. Its simplicity of use will be demonstrated using the quick alignment of compressor gratings as an example.
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