graded focal length lens
... graded focal length lens 梯度焦距透镜 graded groundnut kernel 分级花生仁 graded index fibre 折射率渐变的光导纤维 ...
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把激光棒等效为梯度折射率棒，得到了新的热透镜焦距公式。
Based on that the laser rod is equivalent to gradient index rod (GRIN), a new thermal lens focal length expression was achieved.
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