threshold pumping

The four-energy-level velocity rate equation is illustrated and so is the expression of threshold power. The laser power on the condition of near-threshhold and powerful pumping is estimated.

由钕离子的四能级跃迁的速率方程理论，推出了阈值功率的表达式，并且对近阈值条件下和强泵浦条件下的激光输出功率做了理论预测；

The threshold pumping power is 3.5 W and pulse duration is 50 ns. The slope efficiency is as high as 20%.

激光输出模式为稳定的单纵模，抽运阈值功率为35W，脉冲宽度为50ns，斜率效率高达20%。

The threshold pumping power of the laser is 5.2 mW.

激光器的阈值泵浦功率为5.2mW。

It is found that, for TPL there exist threshold requirements both for pumping and for the light field intensity.

结果表明，双光子激光对抽运和光场强度均有阈值要求。

The relationship between multimode pumping power threshold and fiber length has been obtained according to this model. When the threshold pumping power reaches its minimum, the cavity length of fiber laser is then optimized.

由模型可以求出多模泵浦功率阑值与光纤长度的关系，当泵浦功率闽值最小时，对应的光纤长度为最佳光纤激光器的腔长。

Measurement results of the dependence of the pulse width of the mode-locked pulses, the stability range of laser for stationary single-pulse operation and the threshold pumping power on the concentration of the absorber dye are given.

提供锁模脉冲宽度、激光器以稳定单脉冲工作的稳定性范围和阈值泵浦功率等，对吸收体染料浓度依赖关系的测试结果。

The results show that there is a fixed threshold Xat for the relative pumping parameter Xa of the upper laser level;

结果表明：激光上能级相对泵浦参量Xa具有一个确定的阈值Xat；

By numerical simulation we calculate the threshold satisfied by pumping rate r and damping c, and discuss the influence of cavity loss on the steady photon distribution and the mean photon number.

通过数值模拟给出了有损耗情形注入率r与腔损耗系数c之间应满足的阈值条件，并讨论了不同腔损耗对稳态光子数分布和平均光子数的影响。