A 612 nm iodine stabilized He-Ne laser has been designed and constructed. The 612 nm line was selected by means of a Brewster prism placed in a laser cavity. Seven oscillation lines such as 594 nm, 604 nm, 612 nm, 629 nm, 633 nm, 635 nm and 640 nm could be observed by using the laser system without the iodine cell. The whole 21 components (“a” to “u”) of
127I
2, transition 9-2, R (47), could be obtained by the third harmonic technique. In the frequency locking case to “o” component, the frequency stability was estimated to be 1.6×10
-12 (τ=1000 s). The frequency variation of the two similary constructed 612 nm stabilized He-Ne lasers was estimated to be 1.8×10
-10.
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