Physics – Optics
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.209..655m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 209, Aug. 1, 1984, p. 655-664.
Physics
Optics
18
Electro-Optics, Polarimeters, Telescopes, Data Acquisition, Design Analysis, Electronic Control, Performance Tests, Spectrophotometry
Scientific paper
A powerful new faint-object spectropolarimeter for the 3.9-m Anglo-Australian Telescope is described. It employs an existing spectrograph and Image Photon Counting System (IPCS) together with a custom-built Pockels cell (electro-optic) polarimeter. Quarter-wave plates may be introduced above the cell and thus both linear and circular polarization may be measured. A very high polarimetric efficiency is obtained over the entire optical spectrum; peak values of 96 percent are observed. Instrumental polarization is negligible and the measurement precision is limited only by photon counting statistics. Simultaneous spectrophotometry is possible with only a modest loss in sensitivity compared with the normal spectroscopic mode. Examples of observations are described.
Fordham John
Heathcote Steve R.
McLean Ian S.
Paterson Magnus J.
Shortridge Keith
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