Performance of the spectropolarimeter for the Space Telescope faint object spectrograph

Details Performance of the spectropolarimeter for the Space Telescope faint object spectrograph Performance of the spectropolarimeter for the Space Telescope faint object spectrograph

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982spie..331..259a&link_type=abstract

IN: Instrumentation in astronomy IV; Proceedings of the Fourth Conference, Tucson, AZ, March 8-10, 1982 (A83-31976 14-35). Belli

Physics

Optics

7

Faint Object Camera, Geometrical Optics, Hubble Space Telescope, Polarimeters, Spectrographs, Circular Polarization, Linear Polarization, Magnesium Fluorides, Performance Tests

Scientific paper

The design and preliminary test results for the spectropolarimeter for the Faint Object Spectrograph (FOS) for the Space Telescope are presented. The mechanical design and optical specifications of the spectropolarimeter are described noting that a Wollaston prism with an internal wedge angle of 20 deg is fixed behind each of two rotatable waveplate retarders of different retardations. Either waveplate/prism combination can be positioned at either of the two FOS entrance ports. Magnesium fluoride is chosen as the birefringent crystal for the polarizing elements to allow linear and circular polarization measurements down to Lyman-alpha at 1216 A. Mechanical stability and repeatability were determined by operational testing to give polarization-position angles of + or - 0.5 deg, corresponding to degree-of-polarization measurements of + or - 0.1 percent. Faint-object accuracy, dependent on photoelectron statistics and hence on observation time, is calculated to be one percent in each 100-A-wide spectral band for a 20-min observation of an AO star with V = 15th magnitude.

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