Tunable narrowband birefringent filters for astronomical imaging

Details Tunable narrowband birefringent filters for astronomical imaging Tunable narrowband birefringent filters for astronomical imaging

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1235..466m&link_type=abstract

IN: Instrumentation in astronomy VII; Proceedings of the Meeting, Tucson, AZ, Feb. 13-17, 1990 (A91-29601 11-35). Bellingham, WA

Astronomy and Astrophysics

Astronomy

4

Astronomical Photometry, Birefringent Filters, Imaging Techniques, Liquid Crystals, Narrowband, Optical Filters, Photosphere, Telescopes, Tuning

Scientific paper

Tunable optical retarders made of liquid crystal material can be built with excellent spatial and angular response. These elements have been used to construct birefringent filters which are electronically tunable. Initial breadboard systems realize passbands similar to interference filters, and filters are planned with sub-Angstrom passband. Any desired wavelength in the tuning range may be selected in a random-access fashion, in a few milliseconds. One of these filters has been successfully used recently to image the solar photosphere in the 1.2 - 1.6 micron range at the McMath solar telescope at Kitt Peak.

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