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Figure 7
The ray-tracing results for the spectrometer configuration C in Table 1[link]. The spectral profile distributions at the optimal detector plane for the full wavelength range (2–5 nm) are demonstrated in the lower part of the figure, where the detector dimensions are 140 mm (meridional) × 0.8 mm (sagittal). The ray-tracing results for each wavelength (2, 3, 4 and 5 nm) are presented in (a) to (d), where an identical `domain of interest' is applied at the detector plane for each of them: the meridional size of the spectrograph is 10–15 µm (FWHM), the sagittal size is about 110 µm (FWHM). Then the resolution power at various wavelengths can be calculated through [{{A}}_{{\rm trace}}={\lambda }{/\Delta }{\lambda }]: (a) 6600 at 2 nm, (b) 9500 at 3 nm, (c) 12500 at 4 nm and (d) 15000 at 5 nm.

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