Linear polarimeter with rapid modulation, achromatic in the 0.3-1.1-micron range

Details Linear polarimeter with rapid modulation, achromatic in the 0.3-1.1-micron range Linear polarimeter with rapid modulation, achromatic in the 0.3-1.1-micron range

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apopt..15..605f&link_type=abstract

Applied Optics, vol. 15, Mar. 1976, p. 605, 606. NSF-NASA-supported research.

Physics

Optics

82

Infrared Instruments, Instrument Errors, Light Modulation, Optical Polarization, Polarimeters, Astronomical Photometry, Photographic Plates, Stellar Spectrophotometry, Telescopes, Ubv Spectra

Scientific paper

A polarimeter is described, which provides achromatic modulation over the spectral range 0.3 to 1.1 microns, with very small light losses. The instrument is the first one to use superachromatic half-wave plates; such a plate is made of three achromatic half-wave plates of quartz and magnesium fluoride cemented with the optical axis of the central plate making an angle of 1.00 rad with the axes of the parallel-oriented outer half-wave plates. Wavelength dependence of the axis direction of the optical axis was eliminated by using two identical such plates in front of a Wollaston prism. The plate closer to the prism is stationary, while the other is continuously rotated by a stepper motor. In the polarimeter constructed, the range of instrumentally induced wavelength dependence of the plane of polarization did not exceed 0.002 rad. Using the polarimeter on a 228-cm telescope, a 10-min integration through the blue filter of the UBV photometric system for a star of magnitude 10.0 gives the percentage polarization with a mean error of + or - 0.014%.

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