DTMc300 Double Monochromator
Optical Layout
| Configuration | Pair symmetrical Czerny Turner monochromators arranged for either additive or subtractive dispersion |
| Focal length | Total focal length: 600mm (additive) Individual Units: 300mm |
| Grating mount | Triple grating turret |
| Number of gratings | 1-3 |
| Grating size | 68 x 84mm |
| Aperture ratio | f/4.1 (at all grating angles) |
| Number of entrance/ exit ports | 1 or 2 in both monochromators |
Opto-Mechanical
| Mechanical resolution drive | 0.00014°/ step |
| Slit type | Fixed, micrometer or motorised variable |
| Slit width & height | 10µm-10mm (W) x 20mm (H) |
| Filter size | 23/25mm diameter |
Optical Performance (quoted for 1200 g/mm gratings)
| Spectral range | Within range 200nm-50µm |
| Linear dispersion | 1.35nm/mm (additive) |
| Wavelength accuracy | ± 0.1nm |
| Wavelength reproducibility | ± 0.025nm |
| Resolution full/reduced slit height | 0.15/0.05nm |
| Stray light rejection at 2.5 FWHM | 10-8 |
| Wavelength acquisition speed | 2000nm/s |