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Table 1
Parameters used for estimating the error budget.
| Parameters | Relative value | Physical value |
|
|
||
| Zero mag. flux density in H-band | 1080 Jy | |
| Telescope diameter D | 8 m | |
| Telescope transmission Ttel | 40% | |
| Beamsplitter transmission TBS | 5% | |
| Mask design wavelength λ0 | 1.625 μm | |
| Focal ratio F/# | 40 | |
| Mask diameter d | 1.062 Fλ0 | 69.0 μm |
| Mask phase shift θ | π/2 | |
| Refractive index n (Fused silica) | 1.4431 @ λ0 | |
| Mask depth z | 0.25 λ0/(n − 1) | 0.917 μm |
| Filter wavelength λc | λ 0 | 1.625 μm |
| Filter bandwidth Δλ | 20% | 0.325 μm |
| DM inter-actuator pitch p | 20 cm | |
| AO residual amount | 0.055 λ0 | 90 nm |
| Wind speed v | 10 m s-1 | |
| HAWAII-2RG readout noise | 18 e− | |
| HAWAII-2RG pixel full well | 105 e− | |
| Pupil size | 40 × 40 pixels | |
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