the addition of the sted doughnut reduced the spot area by ninefold, but, owing to its cylindrical shape, did not squeeze the spot axially.

  • 在受激发射损耗减少甜甜圈此外九倍的名胜区,但由于其圆柱形状,并没有当场轴向挤压。

  • 互联网摘选 2026-07-13 05:43:44

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