Low-resolution spectro-polarimeter with broadband achromatic plate and special Wollaston prism

Details Low-resolution spectro-polarimeter with broadband achromatic plate and special Wollaston prism Low-resolution spectro-polarimeter with broadband achromatic plate and special Wollaston prism

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spie.4008..497i&link_type=abstract

Proc. SPIE Vol. 4008, p. 497-508, Optical and IR Telescope Instrumentation and Detectors, Masanori Iye; Alan F. Moorwood; Eds.

Physics

Instrumentation and Detectors

Scientific paper

A new schema of an astronomical spectropolarimeter is suggested based on two original optical elements: 1) a superachromatic revolving retarder containing form 5 to 7 plastic plates to measure all four Stokes parameters in the range from 0.3 to 1.5 (mu) . 2) a complex Wollaston prism with decentered and deformed surfaces which allows to obtain the two spectra with mutual orthogonal polarization. This unit replaces ordinary two-block unit containing a normal Wollaston prism to split the light into two beams and dispersion element to produce the spectrum. Due to minimum of free surfaces the loss of light in the device is very low. The device possess the merits of filtered and grating/prims polarimeters and will allow on 1.25 m telescope to measure the polarization of the objects of about 15 mag with an error less than one percent at the time resolution of parts of hours which is much better in comparison with that for existing deices. It is expected that this spectropolarimeter will provide polarization data simultaneously in the whole optical spectral region.

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