Abstract

The optical effect of free polarization decay in an ultrathin gas cell the inner thickness of which is less than or of the order of the wavelength of the exciting monochromatic laser pulse transmitted orthogonally to plane-parallel walls of this cell is studied theoretically. A new mechanism of the studied effect is established; it is caused by the specificity of phase mismatch of light-induced atomic dipole moments due to transit-time relaxation of atoms in such a cell. As a result, the dynamics of free polarization decay in the considered situation radically differs from the known case in a usual (macroscopic) gas cell. Nontrivial oscillatory dependences of free polarization decay signals on the ratio of the thickness of such ultrathin cell to the radiation wavelength of the exciting pulse are revealed and analyzed.

中文翻译：

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超薄气室的自由极化衰减特征

摘要

理论上研究了超薄气室的自由极化衰减的光学效应，该气室的内部厚度小于或垂直于与该气室的平行平面壁正交发射的激发单色激光脉冲的波长。建立了研究效果的新机制。这是由于这种细胞中原子的穿越时间弛豫所引起的，光诱导的原子偶极矩的相位失配的特异性所致。结果，在所考虑的情况下，自由极化衰减的动力学与通常的（宏观）气室中的已知情况完全不同。揭示并分析了自由极化衰减信号的非平凡的振荡依赖性，这种依赖性取决于这种超薄电池的厚度与激发脉冲的辐射波长之比。