Collisional effects upon optical coherences: Experimental study in a xenon three-level system |
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Authors: | Ph. Cahuzac J. L. LeGouët P. E. Toschek R. Vetter |
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Affiliation: | 1. Laboratoire Aimé Cotton, C.N.R.S. II, bat 505, F-91405, Orsay, France
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Abstract: | Laser induced nonlinear absorption profiles in a three-level system have been recorded to study the effect of elastic collisions upon optical coherences. In our particular system, the signal is due to a pure double-quantum term, where we have separated the effect of phase-interrupting collisions from the effect of velocity-changing collisions. Experimental results show that the effect of velocity-changing collisions is very small, and that broadening of the signal is due to phase-interrupting collisions mainly. We are able to determine the increase of the decay rate of the coherent superposition (the “coherence”) of two levels of same parity [Dγ 13/dp=(6.5±1) MHz/Torr] and an upper limit for the mean velocity change (ũ≲5m/s). |
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Keywords: | 32 34 42.55 |
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