Pump absorption saturation makes the population of the lower pump level and the absorption coefficient decrease, and the output power is lower.
抽运光的吸收饱和使激光器运转时激光下能级的粒子数减小，吸收系数下降，激光器的输出功率较低。
The results show that the Doppler background due to the near resonance of the intermediate level is eliminated and the signal of two-photon transition can be distinguished from saturation absorption.
计算结果表明它能有效地克服中间能级近共振所产生的多普勒背景，并有效地区分单光子饱和吸收讯号和双光子跃迁讯号。
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