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Applied Physics B

Study of relaxation of molecular iodine by the method of saturated absorption spectroscopy

Andrei Goncharov, Mikhail N Skvortsov, Veniamin P. Chebotayev

Published Aug 1, 1990• 18 citations
Publisher
DOI
10.1007/bf00326009

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The cross-relaxation effects that cause Doppler saturation in a saturated absorption signal were examined for several rotational and vibrational bands in the electronic transition of the iodine molecule. It was found that the cross-relaxation time is of the order of a millisecond and that the effect increases with pressure. It was also found that the effect decreases with an increment in the rotational quantum number of lower level. The mechanism for this effect could be explained by two inelastic rotational-level-changing collisions between molecules populated in the lower state.
A theoretical model of modulation transfer spectroscopy (MTS) that includes pump beam depletion is presented and experimentally verified with data covering visible iodine transitions at 532, 543, and 612 nm. This model is used to determine the values for pressure, interaction length, and saturation intensity that yield maximum MTS signals for frequency locking to iodine transitions. The approach is demonstrated for iodine transitions at 532, 633, and 778 nm, with the results showing that theoretically the frequency instability scales inversely to the absorption coefficient.