Phys. Rev. A 77, 063807 (2008) [5 pages]Subnatural linewidth for probe absorption in an electromagnetically-induced-transparency medium due to Doppler averagingReceived 31 October 2007; published 9 June 2008 We obtain subnatural linewidth (i.e., <Γ) for probe absorption in room-temperature Rb vapor using electromagnetically induced transparency (EIT) in a Λ system. For stationary atoms, the EIT dip for a resonant control laser is roughly one-half as wide as the control Rabi frequency Ωc. But in thermal vapor, the moving atoms fill the transparency band so that the final EIT dip remains subnatural even when Ωc⪢Γ. We observe a linewidth of Γ/4 for Ωc=8Γ in the D2 line of Rb. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.77.063807
DOI:
10.1103/PhysRevA.77.063807
PACS:
42.50.Gy, 32.80.Qk, 42.50.Md, 32.80.Wr
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