four-level laser [激光] 四能级激光器 ; 四能阶雷射
four-level solid laser [激光] 四能级固体激光器
four-level laser rod 四能级激光棒
four-level emitter 四能级放射体 ; 四透镜变焦系统
four level laser 四能级激光器
four-level fluoresent solid 四能级荧光固体
four-level laser system 四能级系统
four-level fluoresent crystal 四能级荧光晶体 ; 四能级放射体
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。
The rate equation of tunable pulse ti: sapphire laser is given using the theoretical model of four-level system.
以四能级系统为理论模型对脉冲可调谐掺钛蓝宝石激光系统建立了速率方程。
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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