High Contrast Imaging Performance
| High Contrast Imaging Performance | ||
|---|---|---|
| Inner Working Angle | 1 to 3 l/D | Function of coronagraph configuration |
| Optics throughput (in H-band) | Focal plane masks | 93-99% |
| Classic Lyot mask | 63% | |
| Vortex Lyot mask | 78% | |
| PIAA and inverse PIAA lenses | 96% | |
| MPIAA Lyot | 86% | |
| PIAACMC Lyot | 77% | |
| Detection contrast threshold: 1-4 λ/D (40-160 mas) |
1e-4 | H band, Approximate value, assumes bright star and PSF post-calibration |
| Detection contrast threshold: 4-20 λ/D (160-350 mas) |
1e-5 | H band, Approximate value, assumes bright star and PSF post-calibration |
| Detection contrast threshold: 500-800 mas |
5e-6 | H band, Approximate value, assumes bright star and PSF post-calibration |
| Detection contrast threshold: 1000 mas |
1e-6 | H band, Approximate value, assumes bright star and PSF post-calibration |
| Coronagraph setup time | PIAA (5 minutes), Vortex and shaped pupil (2 minutes) | The PIAA coronagraph uses several more optics which take longer to insert and align |
| Calibration speckle seperation | 0.05-0.9” in all directions (H-bands) | Greatest separation is limited by control region of DM |
| Calibration speckle contrast | 0.1-0.00001 | Note at low contrast the speckles may get lost in the halo. |
| Calibration grid setup time | 1 minute | The contrast and position of speckles for the grid can be setup prior to the run. The setup time listed here is for varifying the grid works and setting camera integration times accordingly. |
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