New design of rhomb-type achromatic retarders
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Corresponding author:
LI Guo-liang, liguolianglq@163.com
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Received Date:
2011-10-08
Accepted Date:
2011-11-07
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Abstract
In order to improve achromatism of rhomb-type retarders,it is necessary to expand selection of materials.According to the principle that the light arising total reflection has a phase transformation in the medium surface,rhomb-type achromatism retarders were analyzed,and relation between the refractive index n and structural angle θ was deduced.Although dn/dλ increases with enlargement of the refractive index ,n,dδ/dn decreases rapidly,so high refractive index materials probably have better achromatism.It was shown that the maximal delay errors of low refractive index materials were smaller than 1.32°,and the maximal delay errors of high refractive index materials were smaller than 0.95° within the range of 350nm~1240nm.Comparing with low refractive index materials,high refractive index materials have better achromatism.
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