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Proceedings Paper

Optical design of a near-infrared birefringent filter system and measurement of birefringence index of calcite
Author(s): Jingshan Wang; Haimin Wang; Thomas J. Spirock; Chik-Yin Lee; Nuggehalli M. Ravindra; Jun Ma; Philip R. Goode; Carsten J. Denker
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Paper Abstract

In this paper, we present an optical design of a near- infrared (at FeI 15648.5A) birefringent filter system which is used to obtain the chromatic images of the sun and measure the solar magnetic field at the Big Bear Solar Observatory (BBSO). This system consists of a prefilter,a liquid crystal analyzer, a wavelength-tunable birefringent filter and a Fabry-Perot Etalon. This system is expected to achieve a clean narrow pass band (1/8A). It can also be tuned across the spectral line to obtain line profiles of two0dimensional fields of view. During the design of the tunable near-IR birefringent filter and the test of its components, we found the value of birefringence index μ(ne-no) of calcite at spectral range near 15648.5A is very different from the value in literature. Because the birefringence index is important for the design of birefringent optical components, the birefringence index of calcite and its thermal coefficient are measured. Some test results of the four pairs of calcite plate used in the birefringent filter are presented.

Paper Details

Date Published: 24 October 2000
PDF: 9 pages
Proc. SPIE 4093, Current Developments in Lens Design and Optical Systems Engineering, (24 October 2000); doi: 10.1117/12.405242
Show Author Affiliations
Jingshan Wang, New Jersey Institute of Technology (United States)
Haimin Wang, New Jersey Institute of Technology (United States)
Thomas J. Spirock, New Jersey Institute of Technology (United States)
Chik-Yin Lee, New Jersey Institute of Technology (Hong Kong)
Nuggehalli M. Ravindra, New Jersey Institute of Technology (United States)
Jun Ma, New Jersey Institute of Technology (United States)
Philip R. Goode, New Jersey Institute of Technology (United States)
Carsten J. Denker, New Jersey Institute of Technology (United States)


Published in SPIE Proceedings Vol. 4093:
Current Developments in Lens Design and Optical Systems Engineering
Robert E. Fischer; Robert E. Fischer; R. Barry Johnson; Warren J. Smith; Warren J. Smith; William H. Swantner, Editor(s)

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