本文研究封闭的∧型三能级激光系统。该系统通过Ｒａｍａｎ过程耦合两低能级来诱导原子相干。激光跃迁发生在高能级与一个低能级之间。结果表明该系统可以建立任意态（裸态和缀饰态）无反转激光，其增益来源于缀饰态原子相干。 This paper studies the closed ∧ three-level laser system. The system induces atomic coherence by coupling two lower energy levels through the Raman process. The laser transition occurs between a high energy level and a low energy level. The results show that the system can establish non-inverted laser in arbitrary state (naked state and embellishment state), and its gain comes from the decoherent state atomic coherence.