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Last update:29 Aug 2023
This page is designed by A.V. Moiseev
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SCORPIO-2:
Spectral Camera with Optical Reducer for Photometric and Interferometric Observations - 2

The diffraction gratings (grisms)

The spectrograph has a set of grisms with a Volume Phase Holographic Gratings (VPHG), which are manufactured by Wasath Photonics (USA)


The quantum efficience of the different grisms. The SCORPIO-2 optical transparency and CCD E2V 42-90 QE curve are taken into account. The best measurements of the standard stars are shown for the wide (more than 10'') slit. The second order contamination for the VPHG940@600 was partly removed

The SCORPIO-2 grisms parameters
Name lines/mmSpectral range, A Dispersion, A/pxSp. resolution (FWHM), A
slit 1" slit 0.7" slit 0.5"
VPHG940@600 940 3500-8500 1.16 7.0 5.0 3.5
VPHG1026@735 1026 5800-9500 1.02 6.1 4.3 3.0
VPHG1200@540 1200 3650-7250 0.87 5.2 3.6 2.6
VPHG1800@590 1800 5000-7245 0.50 3.0 2.1 1.5
VPHG1800@660 1800 5500-7800 0.51 3.0 2.1 1.5
VPHG2400@415* 2400 3500-5100 0.36 2.2 1.5 1.1
VPHG3000@400 3000 3700-4400 0.32 1.9 1.3 1.0
VPHG1200@860 1200 7445-109000.85 5.1 3.6 2.5
* - the grism can be used only in spectropolarimetry mode