arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2406.01447physics.opticsphysics.atom-phquant-ph
收藏

柱矢量光束在非简并四能级原子系统中的线性和非线性传播

Linear and nonlinear propagation of cylindrical vector beam through a non-degenerate four level atomic system

Partha Das, Tarak Nath Dey

AI总结:

研究非简并四能级原子系统中探针矢量光束的相位诱导极化率,发现相移影响线性极化率与偏振旋转,并观察到链状自聚焦与散焦现象,为吸收体转放大器、高分辨率显微及光阱系统提供应用前景。

摘要:

我们研究了原子系统中探针矢量光束(PVB)两个分量的相位诱导极化率。原子被制备在非简并四能级构型中。跃迁由 $π$ 偏振控制场和 PVB 的两个正交偏振分量耦合。我们表明,介质的线性极化率取决于控制场和 PVB 之间的相移,表征了系统中的损耗或增益。此外,相移导致矢量光束(VBs)在传播时发生偏振旋转。我们进一步研究了几个瑞利长度下非线性对 VB 在介质中传播的影响。观察到了径向、方位向和螺旋 VBs 的自聚焦和散焦现象。特殊的链状自聚焦和散焦导致了具有适度增益的连续更小光斑尺寸的形成。因此,控制极化率和自聚焦的机制有望应用于从吸收体到放大器的转变、高分辨率显微镜和光阱系统等领域。

英文摘要:

We investigate the phase-induced susceptibilities for both components of the probe vector beam (PVB) within an atomic system. The atoms are prepared in a non-degenerate four-level configuration. The transitions are coupled by a $π$ polarized control field and two orthogonally polarized components of a PVB. We show that the linear susceptibility of the medium depends on the phase shift between the control field and PVB, characterizing loss or gain in the system. Additionally, the phase shift causes polarization rotation in the vector beams (VBs) as they propagate. We further study the effect of nonlinearity on the VB propagation through the medium for a couple of Rayleigh lengths. The self-focusing and defocusing phenomena are observed for radial, azimuthal, and spiral VBs. The special chain-like self-focusing and defocusing leads to the formation of consecutive smaller spot sizes with moderate gain. Therefore, the mechanism of control of susceptibility and self-focusing may hold promise for applications such as transitioning from an absorber to an amplifier, high-resolution microscopy, and optical trap systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑