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氦-氖激光管长时间点燃时,由于放电管内电子对气体粒子、原子和玻壁的频频碰撞,放出大量热能,再经玻壁与氦、氖气体的传导,使放电管与整个管壳达到一定的温升。用温度计与半导体感温计对管子外壳温度进行测量,大致在38～42℃之间,在铝阴极部位稍高1～2℃,即管壳大约比室温高出20几度。由于管壳厚度不可能拉制得绝对均匀,特别是储气套与贴片管烧结部分厚度更难吹得一致,形成管壳径向变形,进而牵动反射镜的腔片发生偏移,
When the helium-neon laser tube ignites for a long time, a large amount of thermal energy is released due to frequent collision of the electrons in the discharge tube with the gas particles, the atoms and the glass wall, and then the discharge tube and the entire tube shell are reached through the conduction of the glass wall with helium and neon gas A certain temperature rise. The temperature of the tube case was measured with a thermometer and a semiconductor thermometer approximately between 38 and 42 ° C with a slight increase of 1 to 2 ° C in the aluminum cathode portion, ie, the tube case was approximately 20 degrees above room temperature. As the thickness of the shell can not be drawn absolutely uniform, especially the thickness of the gas storage sleeve and the sintered part of the SMD tube is more difficult to be blown to form a radial deformation of the shell, which in turn affects the mirror of the slice to shift,