Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

HIGH-EFFICIENCY "SUPERACHROMATIC" POLARIMETRY OPTICS FOR USE IN OPTICAL ASTRONOMICAL SPECTROGRAPHS

ROBERT W. GOODRICH
Publications of the Astronomical Society of the Pacific
Vol. 103, No. 670 (December 1991), pp. 1314-1322
Stable URL: http://www.jstor.org/stable/40679814
Page Count: 9
  • Read Online (Free)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
HIGH-EFFICIENCY "SUPERACHROMATIC" POLARIMETRY OPTICS FOR USE IN OPTICAL ASTRONOMICAL SPECTROGRAPHS
Preview not available

Abstract

A design for an optical spectropolarimeter consisting of a Pancharatnam half-wave plate and a modified Glan-Taylor polarizing beam splitter retrofitted to an existing astronomical spectrograph is described. The wave plate has a retardance of 180° ± 2° over the entire design wavelength range from 3200 Å to 1.1 μm. The calcite polarizing beam splitter has a beam separation of one beam diameter, and a low length-to-width ratio of 1.035, making efficient use of the limited space available in most spectrographs. Cassegrain CCD spectrographs on the Mount Locke 2.7-m and Mount Palomar 5-m telescopes have been retrofitted with spectropolarimeters of the type described. The combination of these "superachromatic" polarimeter parts with the high-efficiency CCD detectors now used in these and many other astronomical spectrographs should lead to a great expansion of spectropolarimetry in many branches of astronomical research.

Page Thumbnails

  • Thumbnail: Page 
1314
    1314
  • Thumbnail: Page 
1315
    1315
  • Thumbnail: Page 
1316
    1316
  • Thumbnail: Page 
1317
    1317
  • Thumbnail: Page 
1318
    1318
  • Thumbnail: Page 
1319
    1319
  • Thumbnail: Page 
1320
    1320
  • Thumbnail: Page 
1321
    1321
  • Thumbnail: Page 
1322
    1322