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The GRIN-rod lenses are made by two steps ion-exchanging, and the refractive index distribution of the sample is measured by the YaMing interferometer. The results show large differences in the refractive index of the samples. The reason for the increase of the refractive index difference by two-step ion-exchanging is discussed. The results of this research may help to produce GRIN materials.
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Keywords:
- ion-exchanging /
- GRIN-rod lenss /
- electric permittivity /
- state of stress /
- refractive index difference
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