Our results show that the laser gain comes from two basic processes, i. e., a two-photon process and a two-step process.
本文的结果表明，激光增益来源于两个基本过程：两个光子过程和两步过程。
Our results show that the laser gain comes from two basic processes, i. e., a two-photon process and a two-step process.
本文的结果表明，激光增益来源于两个基本过程：两个光子过程和两步过程。
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