Abstract
The thickness of calcite or quartz required for an element of a given half width (FWHM) depends not only on the wavelength and index difference of the birefringent material, but also the first derivative of the index difference with wavelength. For calcite, the effective index difference can differ by as much as 50% from published values.
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References
Beckers, J. M. and Dunn, R. B.: 1965, ‘A Ray Tracing Program for Birefringent Filters’, ARCRL Instrumentation Paper, No. 65.
Beckers, J. M.: 1971, Letter, Appl. Optics 10, 973.
Evans, J. W.: 1949, JOSA 39, 4, 229.
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Title, A.M. Effective index of calcite and quartz. Sol Phys 39, 505–507 (1974). https://doi.org/10.1007/BF00162442
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DOI: https://doi.org/10.1007/BF00162442