Complete Field Measurement of Segmented Beams using Quadri-Wave Lateral Shearing Interferometry

In a previous study (Mousset et al., 2006), we demonstrated that quadri-wave lateral shearing was an appropriate method to determine the phase difference between two sub-apertures of a segmented laser beam. Its main advantage is that the measurement is very simple, since it analyzes the wave front of the recombined laser beam in the near field. In this presentation, we will detail the extension of our method for segmented beam metrology. Experimental examples will be given for cases with low and high aberrations. Sensitivity to spatial frequencies will be investigated.