633nm碘稳定的氦氖激光器是国际计量委员会长度咨询委员会（CC）推荐的复现米定义的主要激光器之一，各国均将它作为长度基准使用。目前，国际上规定的稳频方式是采用3次谐波锁定技术，即调制频率为f时，解调频率为此叨年代初．我国首先提出并实现了采用5次谐波锁定技术，即调 The 633 nm iodine-stabilized He-Ne laser is one of the primary lasers defined by the International Committee on Length Estimation (CC) for the use of replicated rice, which is used by all countries as a length basis. At present, the frequency stabilization method stipulated in the world adopts the third harmonic locking technique, that is, when the modulation frequency is f, the demodulation frequency is the early of this decade. China first proposed and implemented using the fifth harmonic lock technology, that tune