Table 2.
Values of the phase diversities and results obtained for each choice of K.
| K | Defocuses (peak-to-valley) | WFE rms | Contrast | Difference (rms) | L (×10−5) | |
|---|---|---|---|---|---|---|
| Fine | 2 | 0, −0.453 λ | λ/10.7 | 9.6% | 1.9% | 6.2 |
| 3 | 0, −0.453 λ, −0.302 λ | λ/10.6 | 9.8% | 1.2% | 3.0 | |
| 4 | 0, −0.453 λ, −0.302 λ, + 0.121 λ | λ/10.8 | 9.9% | 0.6% | 2.5 | |
| 5 | 0, −0.453 λ, −0.302 λ, −0.151 λ, + 0.121 λ | λ/10.9 | 10.0% | 0% | 1.7 | |
| Coarse | 2 | 0, −0.590 λ | λ/9.5 | 11.2 % | 1.8 % | 3.3 |
| 3 | 0, −0.590 λ, +0.590 λ | λ/9.2 | 10.9% | 1.1% | 2.2 | |
| 5 | 0, −0.295 λ, +0.295 λ, −0.590 λ, +0.590 λ | λ/9.1 | 11.0% | 0% | 1.2 | |
Notes. Column 1: Through-focus mode. Column 2: Value of K used to retrieve the wavefront distortion. Column 3: Peak-to-valley defocuses employed. Column 4: Retrieved wavefront error (WFE) rms. Column 5: Contrast of the restored scene in a quiet-sun region. Column 6: Root mean square difference of the restored scene with the one obtained for K = 5. Column 7: Value of the optimized merit function. The usual focused-defocused PD inversion corresponds to K = 2.
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