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Calculated Spot Size and Working Distance Before and After the Correction of the Cylindrical Astigmatism
| Spot size (Longitude × Azimuth) @ focal position | |
|---|---|
| With glass tube (250-μm inner diameter, 340-μm outer diameter) | 17 μm × 42 μm @ L focus: 650 μm 88 μm × 34 μm @ A focus: 1020 μm |
| Fill the inner tube with index matching fluid and flatten the outer surface | 17 μm × 22 μm @ L focus: 650 μm 20 μm × 17 μm @ A focus: 610 μm |
L: longitudinal direction; A: azimuthal direction.
