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Thanks to the atomic coherence in coupling laser driven atomic system,sub-Doppler absorption has been observed in Doppler-broadened cesium vapor cellvia the /Lambda-type three-level scheme. The linewidth of the sub-Dopplerabsorption peak become narrower while the frequency detuning of coupling laserincreases. The results are in agreement with the theoretical prediction by G.Vemuri et al.[PRA,Vol.53(1996) p.2842].Comment: 12 pages, 5 figures, to appear on Applied Physics

Observation of sub-Doppler absorption in the ?-type three-level Doppler-broadened cesium system