The 20Q20XAR.18 High-Energy Laser Windows is specially designed to eliminate losses in vacuum cell applications and can be used as a vacuum window, convection barrier, or interferometer compensator plate. This 2 inch (50.8 mm) diameter optic is precision polished, select grade fused silica coated with hard refractory multilayers for very high damage threshold. A 30 arc min wedge between the polished faces eliminates fringe patterns and cavity feedback. Newport's AR.18 broadband IR antireflection coating is applied for a 1000 to 1550 nm wavelength range.
| Model | 20Q20XAR.18 |
|---|---|
| Material | UV Grade Fused Silica |
| Diameter | 2.0 in. (50.8 mm) |
| Thickness | 0.37 in. (9.4 mm) |
| Antireflection Coating | 1000-1550 nm (AR.18) |
| Surface Quality | 15-5 scratch-dig |
| Surface Accuracy | λ/10 @ 633 nm |
| Clear Aperture | Central 80% of diameter |
| Wedge | 30 ±15 arc min |
| Diameter Tolerance | +0/-0.13 mm |
| Thickness Tolerance | ±0.38 mm |
| Chamfers | 0.38–1.14 mm face width |
| Chamfers Angle/Tolerance | 45° ±15° |
| Cleaning | Non-abrasive method, acetone or isopropyl alcohol on lens tissue recommended |
