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A new photopolymer based VPHG for astronomy: The case of SN 2013fj
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A new photopolymer based VPHG for astronomy: The case of SN 2013fj
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The spectroscopic studies of near infrared emission arising from supernovae allow to derive crucial quantities that could better characterise physical conditions of the expanding gas, such as the CaII IR HVF spectral feature. For this reason is mandatory to have Diffractive Optical Elements (DOEs) with a spectral coverage in the range 8000 - 10000 Angstroms (for low z sources) combined with a reasonable Signal to Noise Ratio (S/N) and medium-low resolution. In order to cope with all of those requirements we developed a Volume Phase Holographic Grating (VPHG) based on an innovative photosensitive material, developed by Bayer MaterialScience. We demonstrated the capabilities of this new DOE through observation of SN 2013fj as case study at Asiago Copernico Telescope where AFOSC spectrograph is available.
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