Standard Of Time And Frequency Robidyev СЧВР-7
The iodine cell is currently an optical frequency fixed point for He-Ne lasers, which implements the effect of saturated absorption of laser radiation that allows to fix the hyperfine structure of the absorption lines of iodine.
Iodine cell is made of S52-1 glass. And Brewster windows are made of LK-4 glass. Brewster windows are sealed with sitall cement. The cell is filled with the isotope of molecular iodine 127J2.
Iodine cell service life is up to 15 years.