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Rb + -K + ion exchange in BK1 optical glass is utilized to fabricate gradient-index (GRIN) rods. A magnifying GRIN rod with plane-parallel surfaces was prepared in order to demonstrate its refractive index gradient. Ion exchange is carried out by immersing a BK1 cylinder in a RbCl/ZnCl 2 molten salt. K + in BK1 is replaced by Rb + . The Rb + and K ...
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