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Physical Review A

Analysis of sub-Doppler linewidths in inversionless amplification

Gautam Vemuri, G. S. Agarwal, D. N. Rao

Published Oct 1, 1996• 14 citations
Publisher

Abstract

In a recent experiment Zhu and Lin [Phys. Rev. A 53, 1767 (1996)] reported gain linewidths, in a coherently pumped atomic system, which were much less than the Doppler width. We show that this observation is easily explained in terms of our work [Phys. Rev. A 53, 2842 (1996)], which is generalized to correspond to the experimental situation by inclusion of incoherent pumping, and pump and probe laser linewidths. \textcopyright{}1996 The American Physical Society.

DOI
10.1103/physreva.54.3695

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In a recent experiment Zhu and Lin [Phys. Rev. A 53, 1767 (1996)] reported gain linewidths, in a coherently pumped atomic system, which were much less than the Doppler width. We show that this observation is easily explained in terms of our work [Phys. Rev. A 53, 2842 (1996)], which is generalized to correspond to the experimental situation by inclusion of incoherent pumping, and pump and probe laser linewidths. \textcopyright{}1996 The American Physical Society.
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An analysis is made of the effect of Doppler broadening on gain without inversion (GWI) from different aspects in a closed lambda-type three-level system with an incoherent pump. It is shown that, regardless of the driving field being on resonance or not, for the counter- or co-propagating of the probe and driving fields (PDF), GWI does not monotonically decrease or increase with increasing Doppler width. Except for the case of counter-propagating PDF with off-resonance driving field, at a suitable Doppler width one can obtain a gain maximum value much larger than that without Doppler broadening; especially in the situation of the resonant driving field, the co-propagating geometry leads to a larger GWI. In addition, for the counter-propagating geometry, when Doppler width is larger enough, GWI oscillation occurs, and the oscillation amplitude and region increase with increasing Doppler width. These conclusions are very different from that obtained in previous investigation (Lukin et al, Laser Phys. 6 436 (1996)).
We report the experimental observation of steady-state electromagnetically induced transparency and sub-Doppler linewidth in a Doppler-broadened \ensuremath{\Lambda}-type Rb atomic system formed on the 87Rb^{87}\mathrm{Rb}87Rb D2{\mathit{D}}_{2}D2​ transitions. The \ensuremath{\Lambda} system is coupled on one transition by a strong laser and probed on the other transition by a weak laser. The observed sub-Doppler linewidth decreases with the increasing detuning of the strong-coupling laser from the atomic transition frequency and is in good agreement with the theoretical calculations of G. Vemuri, G. S. Agarwal, and B. D. N. Rao [Phys. Rev. A 53, 2842 (1996)]. \textcopyright{} 1996 The American Physical Society.