The weak-signal gain of laser comes from two elementary processes:two-photonprocess and two-step process.
并指出，激光的弱讯号增益来源于两个基本过程：两个光子过程和两步过程。
2
Our results show that the laser gain comes from two basic processes, i. e., a two-photonprocess 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。
3
This paper discusses the process of resonant laser ablation (RLA), where the two step three photon resonant ionization of copper is considered as the best scheme.