Existing lasers use media ranging from crystals doped with rare-earth elements to specific mixtures of gas and even certain sorts of semiconductors.
现有的激光器使用的介质有，掺杂有稀土元素的晶体、特定比例的气体，甚至是某些特定半导体。
Oxide ion yield of the rare earth elements (REE) decreased with the increasing of RF power and the sampling depth, or with the decreasing of carrier gas flow rate.
稀土元素的氧化物离子产率随入射功率和采样深度增加，载气流速减小而降低。
This paper studies the effects of rare earth elements (re) in the gas carbonitriding and puts forward a systematic proposition of the rare earth elements catalyzing mechanism.
本文研究了稀土元素在气体碳氮共渗中的作用，并系统地提出了稀土催化机理。
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