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High-dynamic range segmented mirror metrology by two-wavelength PISTIL interferometry: demonstration and performance

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Academic year: 2021

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Figure

Fig. 1. Side-view layout of the PISTIL interferometer. We focus here on two collimated beams that propagate through the system and ultimately generate the interference pattern on the detector
Fig. 2. A pistilogram of a hexagonal meshed segmented wavefront (2a), and its corresponding Fourier plane (represented in 2D powerspectrum) (2b)
Fig. 3. Illustration of the Vernier comparison used in the two-wavelength PISTIL interfer- interfer-ometer
Fig. 4. Schematic description of PSI interferometric measurement set-up with the cryo- cryo-vacuum chamber, located at LAM
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