Abstract
The power transmission coefficient of the lowest-order transverse electric modes of homogeneous refracting waveguide lenses in glass is analyzed on the basis of the measured near-field intensity distribution of the modes in both waveguiding lens regions. The low-index lens region was a K +Na + ion-exchanged waveguide and the high-index region was made by Ag +Na + ion-exchange. A single lens with propagation losses less than 0.15 dB can be fabricated using a metal mask in addition to the “ionic” mask for the second ion-exchange step.
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