Spatial effects of radiation trapping in an optically thick atomic vapor excited by a laser beam

Scholz, T.; Schiffer, Michael Brian; Welzel, J.; Cysarz, D.; Lange, W.

doi:10.1103/physreva.53.2169

Cited by 15 publications

(7 citation statements)

References 21 publications

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“…Then the concentration of excited atoms decreases, however, due to the optical bleaching this decrease is similar to the natural decay. A similar behavior of the Na(3P) atoms was already modeled by means of other approaches [24][25][26], and was also confirmed experimentally [28,29]. The evolution of concentration of the excited atoms looks differently at the end of the cell, where the excitation is negligible.…”

Section: Monte Carlo Modelsupporting

confidence: 56%

“…Due to interference of both effects, for some geometries (for example: strong excitation of the full optical medium), the fluorescence signal can decrease faster than the natural decay. This phenomenon was confirmed experimentally [27][28][29]. It can occur only within a short time after the excitation.…”

Section: Introductionsupporting

confidence: 52%

“…Due to the strong excitation, the saturation of the resonance transition can occur. Such a case has been investigated intensively within the last decade by several authors using numerical [24], analytic [25][26][27] and experimental methods [27][28][29]. For the strong excitation the Holstein-Biberman equation should be modified.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Radiation Trapping in Atomic Vapour Excited by Weak Resonant Laser Pulses

Chora̧ży

Stacewicz

1999

Acta Phys. Pol. A

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Section: Monte Carlo Modelsupporting

confidence: 56%

Section: Introductionsupporting

confidence: 52%

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Investigation of Radiation Trapping in Atomic Vapour Excited by Weak Resonant Laser Pulses

Chora̧ży

Stacewicz

1999

Acta Phys. Pol. A

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“…The 3P 3/2 atoms are well confined to the excitation zone. Although this may seem unusual in the conditions of severe trapping of the resonance radiation, the effect of the spatial distribution shrinkage at high ground-state densities has already been observed (Scholz et al 1996). ∼ (N c 3/2 ) 2 proportionality was given above.…”

Section: Measurements and Resultsmentioning

confidence: 99%

The temperature dependence of the cross section for the energy pooling process Na(3P)+Na(3P)to Na(4D)+Na(3S)

Horvatić

Movre

Vadla

1999

J. Phys. B: At. Mol. Opt. Phys.

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Abstract. We report the measurements of the temperature dependence of the cross section σ 4D for the energy pooling process Na(3P) + Na(3P) → Na(4D) + Na(3S). The latest two, as yet undisputed, results for σ 4D obtained by different authors at T = 597 K and T = 483 K suggest that this cross section decreases with increasing T , which contradicts the theory and other experiments on similar processes. To resolve this controversy and to examine the temperature trend of the cross section, we have measured the σ 4D in the temperature range 567-705 K, covering the hightemperature region that has not yet been investigated experimentally. To determine σ 4D we have excited sodium atoms in the quasistatic wing of the D1 line using a cw dye laser and measured the fluorescence intensity for the 4D → 3P 3/2 transition, relative to the intensity of the optically thin quasistatic wing of the D2 line. The spatial distribution of the number density of the sodium atoms in the 3P 3/2 state and the sodium ground-state number density were measured too. The method used for the determination of the cross section is advantageous since it entirely circumvents the need to account for the radiation trapping of 3P level radiation, which was substantial under experimental conditions of the ground-state densities being 10 14 -10 16 cm −3 . The measurements of the cross section σ 4D in the investigated temperature range have shown that it increases as ∼ exp(− E/kT ). From the experiment we obtained E = (608 ± 95) cm −1 , which is in excellent agreement with the energy defect (613 cm −1 ) for the considered process, and in fair agreement with the values which follow from recent theoretical calculations.

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“…Incoherent scattering is important from different points of view. It is well known that the scattered field in optically dense media strongly influences such effects as optical pumping and optical orientation [19,[88][89][90][91]. In [92] the influence of incoherent scattering on electromagnetically induced transparency in gas cells was experimentally studied.…”

Section: Electromagnetically Induced Transparency With Scattered Lightmentioning

confidence: 99%

Mesoscopic coherence in light scattering from cold, optically dense and disordered atomic systems

2017

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Coherent effects manifested in light scattering from cold, optically dense and disordered atomic systems are reviewed from a primarily theoretical point of view. Development of the basic theoretical tools is then elaborated through several physical atomic physics based processes which have been at least partly explored experimentally. These include illustrations drawn from the coherent backscattering effect, random lasing in atomic gases, quantum memories and light-atoms interface assisted by the light trapping mechanism. Current understanding and challenges associated with the transition to high atomic densities and cooperativity in the scattering process is also discussed in some detail.

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Spatial effects of radiation trapping in an optically thick atomic vapor excited by a laser beam

Cited by 15 publications

References 21 publications

Investigation of Radiation Trapping in Atomic Vapour Excited by Weak Resonant Laser Pulses

Investigation of Radiation Trapping in Atomic Vapour Excited by Weak Resonant Laser Pulses

The temperature dependence of the cross section for the energy pooling process Na(3P)+Na(3P)to Na(4D)+Na(3S)

Mesoscopic coherence in light scattering from cold, optically dense and disordered atomic systems

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