Affiliation:
1. Naval Research Laboratory
2. Jacobs Corporation
Abstract
Copolymerization offers a promising route to the accurate control of material properties, such as refractive index. For compatible polymers, an ability to produce copolymers with incrementally varying refractive indices is a basic requirement for fabricating gradient-index (GRIN) optics. To determine the accuracy of this approach, we examined the composition dependence of index in several optical copolyimides. We observed deviations from standard model predictions that exceed 5 × 10−3 at certain compositions, consistent with non-ideal copolymer formation. This implies that state-of-the-art GRIN optical design requires careful calibration of the composition dependence in these copolymers. We further found that birefringence is sensitive to the structures of the component polymers, and that the thermo-optic and thermal expansion coefficients vary linearly with composition, within the experimental uncertainty.
Subject
Electronic, Optical and Magnetic Materials
Cited by
1 articles.
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