Hyperfine structure of iodine has been studied at 612 nm by the technique of saturated absorption in an iodine cell placed in a He-Ne laser modified to operate at this wavelength. The most interesting feature of the laser is the existence of strong inverted Lamb dips at a very low vapor pressure, which provides very good short term frequency stability. Some factors which limit the reproducibility of the device are also investigated.
© 1979 Optical Society of America
Pierre Cérez and Seton J. Bennett, "Helium-neon laser stabilized by saturated absorption in iodine at 612 nm," Appl. Opt. 18, 1079-1083 (1979)