Abstract
The ion-exchange process is a well established technology for the generation of gradient-index elements /1/. Because of the high achivable refractive index differences and high transparency of the generated elements Tl-exchange is preferred. But beside the toxicity of Tl-containing salt melts and glasses there is a further disadvantage of Tl-GRIN-elements. This is the high chromatic aberration introduced by the Tl-ion.
© 1994 Optical Society of America
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