Main page
Description
Parameters
Filters
Grisms
Modes:
Direct images
Long-slit
Spectropolarimetry
Scanning Fabry-Perot
IFU
Multislit

MANUALS
PUBLICATIONS


Back to SAO web page

Last update: 28 Mar 2017
This page is designed by A.V. Moiseev
moisavsao.ru

The SCORPIO-2 project:
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 for 1'' slit), A
VPHG940@600 940 3500-8500 1.16 7.0
VPHG1026@735 1026 5800-9500 1.02 6.1
VPHG1200@540 1200 3650-7250 0.87 5.2
VPHG1800@590 1800 5000-7245 0.50 3.0
VPHG1800@660 1800 5500-7800 0.51 3.0
VPHG2400@415* 2400 3500-5100 0.36 2.2
VPHG3000@400 3000 3700-4400 0.32 1.9
VPHG1200@860 1200 7445-109000.85 5.1
* - the grism can be used only in spectropolarimetry mode