Table 1
Examples of astronomical spectrographs that use a VPH grating as the main disperser.
| Instrument | Max R | Density (ℓ/mm) | AOI (°)a | Apertureb (mm × mm) | Reference |
|---|---|---|---|---|---|
| NIGHTc | 75 000 | 1407 | 49.6 | 190 × 130 | Farret Jentink et al. (2023) |
| HERMES | 50 000 | 3827 | 67 | 550 × 220 | Sheinis et al. (2014) |
| WIYN | 25 000 | 3300 | 65 | 480 × 210 | Bershady et al. (2008) |
| APOGEE | 22 500 | 1009.3 | 54 | 475 × 290 | Arns et al. (2010) |
| WEAVE | 25 000 | 2500–3500 | 54 | 373 × 227 | Bianco et al. (2018) |
| MOONS | 18 300 | 1056 | 53 | 2 (mosaic) × 280 × 290 | Ernesto Oliva (co-PI MOONS) |
| AAOmega | 10 000 | 1700 | 47 | >260 × 190 | Smith et al. (2004); Sharp et al. (2006) |
| 6dF/RAVE | 8000 | 1700 | 47 | >260 × 190 | Saunders et al. (2001); Baldry et al. (2004) |
| DESI | 5500 | 1157.4 | 10–20 | 180 × 160 | Edelstein et al. (2018); Ishikawa et al. (2018) |
Notes. The spectrographs are sorted according to resolving power. (a)The AOI does not specifically refer to the incidence angle on the dichromated material. The values in the table were taken from the literature and typically refer to the incidence angle on the glass substrate. However, the incidence angle on the gelatin will depend on the refractive index of the glass substrate. This information is typically not available in the literature. (b)Here, we only define the slightly ambiguous term aperture. For most instruments, the literature does not make a clear distinction between the substrate size and clear aperture. (c)For NIGHT, a VPH in double pass as described in this paper is proposed. The line density, AOI, and aperture are thus more modest.
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