Abstract
A direct measurement of the birefringence of a planar waveguide obtained by Na+ – K+ ion exchange was performed with a double Lloyd interferometer. The results are compared with those obtained by a round-robin test involving the same sample. Birefringence of as much as Δn = (2.0 ± 0.2) × 10−3 was measured.
© 1996 Optical Society of America
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