Birefringence of muscovite mica |
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Authors: | M S El-Bahrawi N N Nagib S A Khodier H M Sidki |
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Abstract: | Birefringence of muscovite mica (ne−no) is usually calculated from the dispersion relations of the indices ne and no. As small differences between relatively large experimentally-measured values, the few available data for birefringence of mica are widely distinct and sometimes contradict basic experimental facts. A different procedure is adopted in this work to measure birefringence directly as a single quantity in terms of the thicknesses of mica plates and the wavelengths at which they act as quarterwave or halfwave phase retarders. Birefringence is found to decrease gradually from −0.0040 at 420 nm to −0.0046 at 700 nm in conformity with pertinent independent experimental results. |
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Keywords: | Muscovite mica Phase plate Birefringence |
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