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Acta Optica Sinica

Influence of Laser-Field Linewidth on Atomic Coherence Effect in Four-Level Atomic System

王丽 Wang Li, 宋海珍 Song Haizhen, 肖绍武 Xiao Shaowu

Published Jan 1, 2008• 2 citations
Publisher
DOI
10.3788/aos20082801.0194

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Using matrix equation,we have calculated the absorpion of the prople field in the four-level atomic system in which three transitions are in N configuration under introducing laser field linewidth.We have done researches on the effects of laser field linewidth on electromagnetically induced absorption.The results indicate that atomic coherence of the four-level atomic system will be abated when the laser field linewidth is build up and laser field linewidth inhibits electromagnetically induced absorption.
Using density matrix equation,influence of the absorption(gain)of the probing field and diffraction efficiency of phase grating in a doubly degenerate four-level atomic system was calculated,under introducing laser field linewidth and intensities,and the variance of the probing field frequency and the variance of the ratio of coupling and probing field intensities,respectively.The results indicated that the increases of coupling field linewidth abates the atomic coherence in four-level system.When without considering(R=0)the coupling field linewidth,the gain and diffraction efficiency are larger than them when considering(R≠0)the coupling field linewidth.We found that the first-order diffraction efficiency of phase grating can reach up to 35%,when variance of the ratio of coupling and probing field intensitiesΩc/Ωp≈400.