Phys. Rev. A 66, 013805 (2002) [4 pages]Narrowing of electromagnetically induced transparency resonance in a Doppler-broadened mediumReceived 29 October 2001; published 15 July 2002 We derive an analytic expression for the linewidth of electromagnetically induced transparency (EIT) resonance in a Doppler-broadened system. It is shown here that for relatively low intensity of the driving field the EIT linewidth is proportional to the square root of intensity and is independent of the Doppler width, similar to the laser-induced line narrowing effect described by Feld and Javan. In the limit of high intensity we recover the usual power-broadening case where the EIT linewidth is proportional to the intensity and inversely proportional to the Doppler width. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.66.013805
DOI:
10.1103/PhysRevA.66.013805
PACS:
42.50.Gy, 32.70.Jz, 42.55.-f, 42.65.-k
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