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Table 3.

Parameters for measurement method comparison and quadrant misalignment experimental runs.

Optical bench and numerical simulation configuration
Telescope D = 18.0 m diameter
Circular pupil – No obstruction

Single von Karman ground layer
Turbulence layer r0 = 12.9 cm–L0 = 25 m
m s−1

Source On-axis natural guide star
Readout noise 0.3 e (bench: added numerically)

Loop rate Simulated as 500 Hz

Tip-tilt mirror
(bench: physical mount)
Deformable mirrors Square pitch piezo-stack
(bench: on LCOS-SLM)a
Piezo-stack mirror 39 × 39 actuators – Total 1,177 in pupil

PWFS subapertures 44 × 44 (simu.)–46 × 46 (bench)
PWFS wavelength Monochromatic at 658 nm
PWFS modulation Circular, tunable radius.
Simulation method Focal phase mask
(quadrants interferences included)

Modal integrator
Controller Optimized Karhunen–Loëve basisb
(defined on DM actuators)
Controller Gain Optimized scalar loop gain
Modal sensitivity compensationc,d

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