This article has an erratum: [erratum]
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|
|Source||On-axis natural guide star|
|Readout noise||0.3 e− (bench: added numerically)|
|Loop rate||Simulated as 500 Hz|
|(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)|
|Controller||Optimized Karhunen–Loëve basisb|
|(defined on DM actuators)|
|Controller Gain||Optimized scalar loop gain|
|Modal sensitivity compensationc,d|
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