初始相干性注入系统中的无反转或反转激光增益

本文提出一个有初始相干性注入的开始Ｖ型三能级系统模型。这个系统可以展示从较高发态到基态的无粒子数反转激光增益，也可以用来实现粒子数反转激光，同时这个系统还可以产生无吸收的较大折射率。

Lasing Gain Without or With Inversion from a System with Injected Initially Coherence

We give a theoretical model from an open Vtype three level system with injected initially coherence.This model exhibits lasing gain from the higher excited state to the ground state without population inversion.The model can also be used to establish laser with population inversion.Furthermore,the model system can be used to generate a larger refractive index with zero absorption.