Based on the rate-equation theory of four-level system, the expressions of threshold pump power, output power and slope efficiency are given.
在本章中，我们首先从四能级激光系统空间速率方程理论出发，得到了阈值泵浦功率、输出功率和斜效率的表达式。
参考来源 - LD双端端面泵浦的高功率连续单频Nd：YVO·2,447,543篇论文数据，部分数据来源于NoteExpress
Solid laser is a four-level system.
固体激光器是一个四能级系统。
A data transformation interface was developed to get the four-level product model.
开发了数据转换接口，获得了四层次的产品模型。
Using our hierarchy, we can easily imagine a four-level process configuration for a large organization, as shown in Figure 2. Each layer contributes to the process above it.
用我们的层次，我能很容易就能够想象一个大的组织的四层过程结构，如图2所示。每一个层次会对它上面的过程有所帮助。
For the first time the W.H.O.raised its alert level from phase four to phase five on April twenty-ninth.
VOA: special.2009.05.06
It says H.I.V.-related deaths appear to have reached their highest level in two thousand four.
VOA: special.2009.12.08
Phase four means that a virus has gained the ability to cause community-level outbreaks.
VOA: special.2009.05.06
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