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Competition of Concentration Narrowing and Power Broadening of a Dark Resonance in a Ladder System of Rubidium Atoms: Specificities of Its Occurrence in Thin Spectroscopic Cells
Optics and Spectroscopy ( IF 0.6 ) Pub Date : 2020-11-01 , DOI: 10.1134/s0030400x20100227
A. Sargsyan , Ch. S. Adams , T. A. Vartanyan , D. Sarkisyan

Abstract

The effect of electromagnetically induced transparency (EIT) in a three-level ladder system 5S1/2‒5P3/2 –5D5/2 of Rb atoms is investigated. The effect of spectral narrowing of a dark resonance (DR) as a function of atomic vapor density and thickness L of a spectroscopic cell containing Rb vapor is demonstrated. Thickness L was varied in the range of 390 nm to 4 mm, while atomic density N was increased up to ~1016 cm–3; in the process, high-intensity coupling radiation and weak probe radiation were used. The strongest effect, namely, a 22-fold spectral narrowing of the DR, was achieved in a cell of thickness L = 4 mm. The effect of spectral narrowing was decreasing with decrease in thickness L: a 2.4-fold spectral narrowing of the DR was observed at L = 2 μm. Spectral narrowing was nearly absent at L = 0.8 μm, and spectral broadening of the DR was observed with further decrease in the cell thickness down to L = 0.4 μm. A close to 100% DR contrast was achieved in nearly all cases at moderate atomic densities and high intensities of the coupling radiation. An interpretation of the effect of spectral narrowing and broadening of the DR is proposed.



中文翻译:

a原子梯系统中浓度共振和暗共振功率展宽的竞争:其在薄光谱细胞中的存在特异性

摘要

研究了三级阶梯系统Rb原子5 S 1/2 ×5 P 3/2 –5 D 5/2的电磁感应透明性(EIT)的影响。证明了暗共振(DR)的光谱变窄作为原子蒸气密度和包含Rb蒸气的光谱池厚度L的函数的作用。厚度L在390 nm至4 mm的范围内变化,而原子密度N增加至〜10 16 cm –3; 在此过程中,使用了高强度耦合辐射和弱探针辐射。在厚度为L = 4 mm的单元中,实现了最强的效果,即DR的光谱范围缩小了22倍。光谱变窄的影响随厚度L的减小而减小:在L = 2μm时,DR的光谱变窄为2.4倍。在L = 0.8μm时几乎不存在光谱变窄,并且观察到DR的光谱变宽,并且细胞厚度进一步减小到L= 0.4微米。在几乎所有情况下,在中等原子密度和高耦合辐射强度下,都可以达到接近100%的DR对比度。提出了对DR的光谱变窄和变宽的影响的解释。

更新日期:2020-11-02
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