在QCD领头级近似之下计算了单、双光子的产生截面。
Cross sections of both single and double photon are calculated in leading order QCD corrections.
为了获得更加清晰的光谱线，他们成功发现了非线性方法像磁性饱和和双光子光谱学。
Tomget sharper spectral lines, they started by successfully developing nonlinear methods such as saturation or two-photon spectroscopy.
第一章主要介绍了非线性光学和双光子吸收材料的研究现状。
In the first chapter, nonlinear optics and the research of two - photon absorption materials are introduced.
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