Effects of iodine saturation dispersion on the 127I2 stabilized He-Ne laser

Abstract
In a 127I2 stabilized 633‐nm He‐Ne laser, the effects of saturation dispersion in iodine on the inverted Lamb dips of the iodine hyperfine components are discussed. Analytical expressions for the second and third harmonic of the frequency modulated dips are derived. Dispersion is found to influence strongly the modulation dependent frequency shifts of the absorption line centers and also introduce asymmetry in the second harmonic.