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T-ReCS Diffraction Gratings
T-ReCS contains three diffraction gratings and an optical flat mounted on a rotating turret. Each diffraction grating is used in first order.
| Name | Lines/mm | Blaze wavelength (µm) |
Rmax1 | Dispersion (nm/pixel) |
Wavelength coverage (µm) |
| Lo-Res-10_G5401 | 11 | 10.1 | 113 | 22.13 | whole window, limited by filter (normally N) |
| Lo-Res-20_G5402 | 7 | 21.9 | 78 | 33 | whole window, limited by filter (normally Q broad) |
| Hi-Res-10_G5403 | 90 | 10.4 | 1161 | ~3 2 | 0.94 |
1 Resolution at the grating blaze wavelength using the narrowest (0.21") slit
2 HiRes-10 dispersion varies significantly over the 8 - 13 micron window