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Rotondaro, Matthew D.; Perram, Glen P.

doi:10.1103/physreva.58.2023

Cited by 13 publications

(18 citation statements)

References 27 publications

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“…We first solve for the ground-state population distribution after control field optical pumping of the Rb D 1 line, taking into account Doppler broadening, pressure broadening, and collisional depolarization of the excited state sublevels [28]. We find the depolarization to be fast enough (for 30 Torr Ne, γ depol = 2π × 190 MHz [36]) to ensure roughly equal populations in each of |F, m F = |1, −1 , |1, 0 , |1, 1 , and |2, 2 ground state sublevels. Given this population distribution, we calculate the optical depth αL for the signal field as a function of Rb number density.…”

Section: Experimental Arrangementsmentioning

confidence: 99%

Optimal light storage in atomic vapor

2008

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We study procedures for the optimization of efficiency of light storage and retrieval based on the dynamic form of electromagnetically induced transparency (EIT) in warm Rb vapor. We present a detailed analysis of two recently demonstrated optimization protocols: a time-reversal-based iteration procedure, which finds the optimal input signal pulse shape for any given control field, and a procedure based on the calculation of an optimal control field for any given signal pulse shape. We verify that the two procedures are consistent with each other, and that they both independently achieve the maximum memory efficiency for any given optical depth. We observe good agreement with theoretical predictions for moderate optical depths (< 25), while at higher optical depths the experimental efficiency falls below the theoretically predicted values. We identify possible effects responsible for this reduction in memory efficiency.

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Section: Experimental Arrangementsmentioning

confidence: 99%

Optimal light storage in atomic vapor

2008

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“…In * tgwalker@wisc.edu 1 Throughout this paper we assume that the quantization axis is parallel to the pumping light propagation direction. Thus h = 1 light corresponds to photons with J z = 1. addition, He collisions can collisionally transfer the 5P 1/2 population to 5P 3/2 , albeit with a small cross section [9]. The existence of this excited-state spin-relaxation process implies that, during collisions with He atoms, the 5P 1/2 and 5P 3/2 states are somewhat mixed.…”

Section: Introductionmentioning

confidence: 99%

Circular dichroism of RbHe and RbN2molecules

et al. 2010

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We present measurements of the circular dichroism of optically pumped Rb vapor near the D 1 resonance line. Collisions with the buffer gases 3 He and N 2 reduce the transparency of the vapor, even when fully polarized. We use two methods to measure this effect, show that the He results can be understood from RbHe potential curves, and show how this effect conspires with the spectral profile of the optical pumping light to increase the laser power demands for optical pumping of very optically thick samples.

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“…As a consequence, a significant thermalization of the excited state density matrix take place in a time shorter than the excited state lifetime. The cross section for excited state collisional m J mixing was measured by several authors [18][19][20][21]. Using the figures in [19] and the Ne density corresponding to the experiments the collisional decoherence rate of the excited state γ coll can be estimated as γ coll ≈ 4Γ where Γ is the excited state spontaneous emission decay rate.…”

Section: Introductionmentioning

confidence: 99%

Inhibition of electromagnetically induced absorption due to excited-state decoherence in Rb vapor

Failache¹,

Valente²,

Ban³

et al. 2003

Phys. Rev. A

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The explanation presented in [Taichenachev et al, Phys. Rev. A 61, 011802 (2000)] according to which the electromagnetically induced absorption (EIA) resonances observed in degenerate two level systems are due to coherence transfer from the excited to the ground state is experimentally tested in a Hanle type experiment observing the parametric resonance on the D1 line of 87 Rb. While EIA occurs in the F = 1 → F ′ = 2 transition in a cell containing only Rb vapor, collisions with a buffer gas (30 torr of N e) cause the sign reversal of this resonance as a consequence of collisional decoherence of the excited state. A theoretical model in good qualitative agreement with the experimental results is presented.

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Collision-induced transitions between the Zeeman-split(J,m)levels ofRb(52

Cited by 13 publications

References 27 publications

Optimal light storage in atomic vapor

Optimal light storage in atomic vapor

Circular dichroism of RbHe and RbN2molecules

Inhibition of electromagnetically induced absorption due to excited-state decoherence in Rb vapor

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