本文第一部分叙述了多谱线氦氖激光器的研制,得到了640hm,633nm、630nm、612nm四种不同波长的激光。第二部分提出了用测萤光相对强度的方法,研究小讯号增益系数与放电电流的关系,并用以分析实验结果。第三部分简单报导了在612 nm、630 nm波长处观察I_2饱和吸收谱的一些初步结果。 The first part of this article describes the development of multi-spectral helium-neon laser, obtained four different wavelengths of 640hm, 633nm, 630nm, 612nm laser. The second part proposes the method of measuring the relative intensity of fluorescence to study the relationship between the gain factor of small signal and the discharge current and to analyze the experimental results. The third section briefly reports some preliminary results of I_2 saturation absorption spectra observed at 612 nm and 630 nm.