Table 2. Optical parameters of the AGM and AGS gratings.
Both gratings have a laminar groove profile with a duty ratio of 2:3 and a groove depth between 8 and 6 nm, with a position-dependent density n(x) = n 0 + n 1 x, where x is defined in §3.2.
| AGM | AGS | |
|---|---|---|
| Size (L × W × T) (mm3) | 186 × 45 × 10 | 186 × 45 × 10 |
| Substrate | Si | Si |
| Coating | Au | Au |
| Radius (m) | 85–155 | 50–60 |
| Entrance arm (m) | r 1 = 4.0 | r 1′ = 2.5 |
| Exit arm (m) | r 2 = 2.5 | r 2′ = 5.5 |
| n 0 (grooves mm−1) | 1200 | 1200 |
| n 1 (grooves mm−2) | 0.80 | −0.32 (low energy) |
| −0.13 (high energy) |