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Physical Review A

Sub-Doppler light amplification in a coherently pumped atomic system

Yifu Zhu, Ji Lin

Published Mar 1, 1996• 46 citations
Publisher

Abstract

We report the observation of steady-state amplification of a weak probe laser without population inversion in the bare states in a Doppler-broadened \ensuremath{\Lambda}-type Rb atomic system. The probe amplification was observed with the Rabi frequency of a coupling laser much smaller than the Doppler width and can be viewed as due to the dressed-state inversion. A 10% single-pass amplification of a weak probe laser was obtained, and the measured linewidth of the gain spectral feature approaches the Rb natural linewidth. A theoretical analysis based on a three-level Doppler-broadened \ensuremath{\Lambda} system is presented, and qualitative agreement with the experiment results is achieved. \textcopyright{} 1996 The American Physical Society.

DOI
10.1103/physreva.53.1767

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We report the observation of steady-state amplification of a weak probe laser without population inversion in the bare states in a Doppler-broadened \ensuremath{\Lambda}-type Rb atomic system. The probe amplification was observed with the Rabi frequency of a coupling laser much smaller than the Doppler width and can be viewed as due to the dressed-state inversion. A 10% single-pass amplification of a weak probe laser was obtained, and the measured linewidth of the gain spectral feature approaches the Rb natural linewidth. A theoretical analysis based on a three-level Doppler-broadened \ensuremath{\Lambda} system is presented, and qualitative agreement with the experiment results is achieved. \textcopyright{} 1996 The American Physical Society.
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.
We demonstrate amplification without inversion in the 87Rb D1-line pumped by an incoherent light. A closed N-type, four-level atomic system has been considered to obtain an insight into the origin of the gain as well as the conditions under which the system exhibits gain without population inversion in bare states. We investigate the gain as a function of the incoherent pumping rate, the coupling laser detuning, and Rabi frequency. The experimental results are in good agreement with the numerical calculations considering the velocity distribution of atoms.
Light amplification without population inversion and absorption with inversion driven by quantum coherent interferences in a closed three level V-type system is studied from the point of view of two color dressed state basis. Approximate analytic time dependent solutions, for coherences and population distribution are derived, and compared with full numerical solutions. Steady state quantities are also calculated, and the conditions under which the system exhibits gain with and without inversion, in the dressed state representation are derived. It is found that for a weak probe laser field light amplification without inversion may occur, for a range of system parameters, in both the bare and the dressed state representations.
In a Doppler broadened three-level Λ-type atomic system, we investigate the absorption spectrum of a weak probe laser in the presence of a saturating laser and a coupling laser. We find that, in order to observe coherent hole-burnings effectively, the two lower levels should be so well spaced that atomic collisions can be neglected, and the saturating (coupling) laser should counter-propagate (co-propagate) with the probe laser. We also give a qualitative analysis to understand the physical origin of coherent hole-burnings.