| 摘要 |
A focusing device (1) with a refractive index profile changing from the center of the focusing device (1) towards its perimeter (3), is made of a material wherein the lateral refractive index distribution of the focusing device material is homogeneous and wherein the focusing device (1) comprises holes (2) for introducing a graded refractive index profile. This allows accurate control of the graded refractive index profile. <IMAGE>
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