论文标题
光涡旋中原子的四极吸收率和轨道角动量转移
Quadrupole absorption rate and orbital angular momentum transfer for atoms in optical vortices
论文作者
论文摘要
最近的实验涉及光学涡流与四极转变中原子的相互作用，已显示出在原子的电子状态和光学涡流场之间的轨道角动量（OAM）的交换。理论和实验的早期工作都排除了电偶极子原子过渡中的涡流OAM转移到电子自由度的转移，并且已经证实，涉及OAM转移到电子运动的最低多极阶的确实是电力四倍体。迄今为止，涉及光学涡旋的四极过渡尚未量化，因此我们着手评估吸收率，伴随着OAM转移，参考$ 6^2s_ {1/2} \ rightArrow 5^2d_ {5/2d_ {5/2} $在CS cesium in ces atom atom atom at optical to the limative to linallive optal to in linallive yelly tollimatized linaldiase optical optal in lunialdiate in lunigative optical to vort vort vort。我们的结果假设典型的实验可访问参数表明，中等光强度的吸收率小于四极自发的发射速率，但仍应在现代光谱技术的测量能力范围内。
Recent experiments involving the interaction of optical vortices with atoms in quadrupole transitions have been shown to be accompanied by the exchange of orbital angular momentum (OAM) between the electronic states of the atom and the optical vortex field. Earlier work by both theory and experiment had ruled out the transfer of a vortex OAM to the electronic degrees of freedom in an electric dipole atomic transition and it has been confirmed that the lowest multipolar order involving an OAM transfer to the electronic motion is indeed the electric quadrupole. Hitherto, the quadrupole transition involving optical vortices has not been quantified and we have thus set out to evaluate the absorption rate accompanied by an OAM transfer with reference to the $6^2S_{1/2}\rightarrow 5^2D_{5/2}$ in Cs when caesium atoms are subject to the field of a linearly polarized optical vortex. Our results assuming typical experimentally accessible parameters indicate that the absorption rate for moderate light intensities is smaller than the quadrupole spontaneous emission rate, but should still be within the measurement capabilities of modern spectroscopic techniques.
