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Fig. 10

image

Experimental response of the APF-WFS obtained on the SCExAO internal (super-continuum) source in the H-band. Each plot features (on the vertical axis) the reponse of the sensor to a Zernike mode of RMS amplitude that varies over a ±150 nm range (units for both axis are in nm). While nearly linear over the entire range for most modes, the sensor only exhibits a significant non-linear behavior for the coma 2, and the two trefoil modes when the DM Zernike amplitude is larger than 80100 nm. We note that this limit is on the DM surface, which must be doubled if refering to aberrations on the wavefront.

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