In this paper, we use the dressed-atom approach to derive the analytical expression of the gain of a FIRlaser with a four-level system.
本文用缀饰原子方法解出四能级系统远红外激光增益系数的解析表达式。
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In the high efficiency and small signal region, we investigate theoretically the efficiency enhancement mechanism of far infrared free electron laser (FIR-FEL) with a reverse tapering waveguide.