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Table 1.

Main parameters of the post-AO PSF modeling.

Turbulent atmosphere parameters
Fried parameter r 0 (at 500 nm) 7 cm and 5 cm
⇒ Resulting seeing angle (at 500 nm) 1.44″ and 2.02″
Number of turbulent layers 3
Layer altitudes [0, 7852, 13252] m
Layer velocities [10, 10, 10] m−1s
Layer profile relative weight [0.942, 0.038, 0.02]
Wavefront outer scale ℒ0 27 m

Telescope parameters
Effective diameter 4 m
Obstruction ratio none (off-axis mirror)

AO system parameters
Deformable mirror configuration 44 × 44
Shack–Hartmann configuration 43 × 43
Wavefront sensing exposure time [ms] 2
Additional AO-loop delay time [ms] 0.5
Wavefront sensing RON [e rms] 20
Additional anisoplanatic off-axis angle 2.6″
Closed-loop gain 0.5
⇒ Resulting Strehl ratio (at 630 nm) 0.30 and 0.12

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