标题： 超薄气体电池中的线性光学次 Doppler 拉姆齐共振 显示英文标题

标题： Linear optical sub-Doppler Ramsey resonances in ultrathin gas cells

摘要： 本文从理论上建立了并研究了在某些条件下出现在光谱线中心附近的亚多普勒线性光学拉姆齐共振现象，这些现象发生在足够弱的单色光束沿垂直方向平稳穿过超薄气体池时吸收光的过程中，该气体池的内部厚度小于或接近于该辐射的波长。 我们考虑这样一种情况：该光束的横截面由两个同轴且空间分离的区域组成，在光束相对狭窄的中央部分检测到吸收信号。 本文研究了在这种吸收光谱中出现的线性光学拉姆齐共振对这些区域之间距离以及它们之间的相位差的显著依赖关系。特别是，如果这个相位差接近π，则入射光束中央部分可能会发生放大而不是吸收。 所考虑的拉姆齐共振在气体池内部厚度等于共振辐射小半整数倍波长时表现得最为明显。然而，如果此厚度等于该辐射波长的整数倍，则不会产生这些共振。 在特定条件下，所建立的拉姆齐共振可以应用于超高分辨率原子（分子）光谱学，以及紧凑型光学频率标准的有效参考。 显示英文摘要

摘要： The paper theoretically establishes and studies the sub-Doppler linear optical Ramsey resonances that arise under certain conditions near centers of optical transitions in the absorption of a sufficiently weak monochromatic light beam during its stationary propagation in the normal direction through an ultrathin gas cell whose internal thickness is less than or of the order of the wavelength of this radiation. We consider a situation when the cross section of this beam consists of two coaxial spatially separated regions, with the absorption signal being detected in a comparatively narrow central part of the beam. The paper studies the significant dependence of the linear optical Ramsey resonances, that arise in such an absorption spectrum, on the distance between these regions, as well as on the phase difference between them. In particular, it is shown that if this phase difference is close to pi, then instead of absorption, amplification of the central part of the incident beam can occur. The Ramsey resonances under consideration are most clearly manifested when the internal thickness of the gas cell is equal to a small halfinteger number of wavelengths of the resonant radiation. However, these resonances do not arise if this thickness is equal to an integer number of such waves. The established Ramsey resonances, under certain conditions, can find application in ultrahigh resolution atomic (molecular) spectroscopy, as well as effective references in compact optical frequency standards.