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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