Table 2
Properties of the IFSW kW-class-ps laser system and the helical drilling optics.
| IFSW kW-ps laser [7] | |
| Pulse duration | 8 ps |
| Wavelength | 1030 nm |
| Average power | ≤650 W |
| Max. pulse energy | ≤2.2 mJ |
| Repetition rate | ≤300 kHz |
| M2 | <1.3 |
| Polarization | Linear |
| Collimated beam diameter | 5.2 mm |
| Helical drilling optics (GL-Trepan, GFH GmbH) | |
| Rotation speed | 0–30 000 rpm |
| Hole diameters | 0–1500 μm |
| Inclination angle | 0−4° |
| Focusing and ablation threshold | |
| Focal length | 400 mm |
| Focus diameter | 140 μm |
| Polarization | Circular |
| Focus position | On the surface |
| Max. fluence | 15 J/cm2 |
| Ablation threshold (steel, 8 ps, 1030 nm) | 0.1 J/cm2 |
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