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Speckle index versus pinhole size for an objective lens NA of 0.8. These measurements (plotted in Fig. 2) represent the commonly implemented configuration of opening the pinhole to reduce speckle noise.
| Pinhole size (μm) | 25 | 50 | 100 | 150 |
|---|---|---|---|---|
| Effective resel size | 1.0 | 1.9 | 3.8 | 5.7 |
| Measured optical FWHM sectioning (μm) | 1.4 | 1.6 | 3.0 | 4.4 |
| Speckle index of images in Fig. 3 | 0.73 | 0.47 | 0.28 | 0.20 |
