A near-infrared prism spectrophotopolarimeter

Details A near-infrared prism spectrophotopolarimeter A near-infrared prism spectrophotopolarimeter

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104..949t&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, no. 680, p. 949-954.

Physics

Optics

10

Astronomical Polarimetry, Near Infrared Radiation, Polarimeters, Spectrophotometers, Prisms, Spectral Resolution

Scientific paper

A description of a 16-channel prism spectrophotopolarimeter (PSP) is presented. It covers the near-IR spectral region from 0.9 to 2.5 microns, including the standard, I, J, H, and K bands, with a resolution of about 0.1 micron. This spectrometer employs cooled field optics to alleviate wavelength shifts caused by differences of image positions in the diaphragm. The field optics, in cooperation with the simultaneity owing to the 16-channel linear array, make it possible to achieve polarimetric accuracies as high as 0.2 percent. The PSP is capable of quick conversion between photometric and polarimetric modes by inserting or retracting a half-wave plate and a wire-grid polarizer in the optics. The detection limits of the photometric mode at the UH 2.2-m telescope on Mauna Kea are 13.0, 12.6, 12.7, and 11.7 mag/sq rt Hz at the wavelength corresponding to the 0.94 (i), 1.18 (j), 1.62 (h), and 2.13 (k) band center, respectively. Examples of the observed data are presented.

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