Abstract
The frequency shifts of a 127I2-stabilized He-Ne laser at 633 nm wavelength induced by changing the iodine pressure between 0.8 and 17 Pa inside an absorption cell are investigated at different amplitudes of modulation. The results show the well-known linear pressure shifts between 5 and 17 Pa, but also non-linear pressure shifts between 0.8 and 5 Pa, dependent upon the amplitude of modulation and the hyperfine structure (HFS) component. These shifts show a different behaviour for two iodine cells, one of which apparently contains a certain amount of impurities. Possible causes for the non-linear frequency-pressure dependence are discussed. The results obtained with the contaminated iodine cell can be explained by supposing that the condensation point is reached of a second gas present inside the cell.
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