自聚焦透镜（Grin Lens）又称为梯度变折射率透镜，是指其折射率分布是沿径向渐变的柱状光学透镜。具有聚焦和成像功能。
In the special case of the index varying quadratically with the distance in the transverse direction, the medium is referred to as self-focusing lens; the last type is the spherical GRIN medium.
在特定条件下,折射率随横向距离的变化满足抛物线规律,此介质被称为自聚焦透镜;最后一种类型是球型梯度折射率介质。
参考来源 - 梯度折射率球透镜的制备及其光学性能研究·2,447,543篇论文数据，部分数据来源于NoteExpress
并从理论上对自行研制的自聚焦透镜的光斑尺寸进行了计算。
Then the optical spot of GRIN-rod lens is calculated in theory.
该方案包括优化记录和重现光路，以及采用自聚焦透镜准直重现光波。
The scheme includes optimizing the recording and reconstruction geometries and collimating the reconstruction wave with a gradient-index lens.
在自聚焦透镜生产中涉及到一个重要的质量检测问题：毛坯玻璃丝的在线直径测量。
Measuring the diameter of the raw glass rod is an important problem of quality control in the process of grin lens production.
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