1. | Material: | optical grade monocrystalline Ge | 2. | Clear aperture: | > 90% of a size | 3. | Diameter (width & length) tolerances, mm: | +0.0 / -0.1 | 4. | Thickness tolerance, mm: | +/- 0.1 | 5. | Parallelism, arc. min.: | <= 5 | 6. | Surface quality, scr/dig: | | | | for parts to 3 in.: | 40/20 | | | for parts to 8 in.: | 60/40 | | | for larger parts: | 80/50 | 7. | Surface figure (power-irregularity) @ 633 nm, fringe: | 1 - 1/2 | 8. | Coating (residual reflectivity is specified per surface): | | | | AR/AR @ 10.6 µm, %: | < 0.5 | | | BBAR/BBAR @ 9-11 µm, %: | 2.0 | 9. | Damage threshold: | | | | CW mode, kW/cm2: | 1 |
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