Fig. 3.

Dynamic wavefront distortions over a 5 mm pupil diameter in the 7.9 kHz resonant scanner operating at 6.1° across the sinusoidal oscillation are shown in (a). The total wavefront distortions are shown in (b), and oblique astigmatism subtracted wavefronts in (c). The plots of the variation of wavefront RMS, Zernike coefficients, Strehl ratio (at 680 nm) and increase in the FWHM of the PSF (at 680 nm), across the field of view, are shown in (d)–(g). The green shaded region in (f) satisfies the Maréchal criterion. The inset diagrams in (g) show PSFs at three different scanner mirror orientations.