使用两米法线入射式真空摄谱仪和电容放电光源。实验表明，光源气压对NIII谱线的出现有显著的影响。
Experimental results indicate the evident effect of the pressure of light source on the appearance of NIII spectral lines.
晶体倍频中当晶体表面法线与相位匹配方向不一致时，需调整入射光方向使相位失配最小。
It is necessary to adjust the direction of incident light for minimum phase mismatching when the direction of phase matching deviated from crystal normal direction.
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