论文标题
光学泵送Alh $^+$的协议
Protocol for Optically Pumping AlH$^+$ to a Pure Quantum State
论文作者
论文摘要
我们提出了一种光学抽水方案，以准备纯状态的被困$ \ mathrm {alh}^+$分子，拉伸的超细状态$ \ lvert f = \ frac {7} {2} {2}，\，\，m_f = \ frac {7} \ mathrm {x}^2σ^+，\，v = 0，\，n = 0 \ rangle $。我们的方案利用宽带脉冲激光器的线性偏振和圆形偏振场来降低自由度的旋转程度，并分别将种群推向超细状态。我们通过求解代表性的速率方程式系统来模拟种群动力学，该系统是激光场，黑体辐射和自发发射的介绍。为了对超细结构进行建模，使用RASSCF波函数计算了$ \ mathrm {a}^2π$激发态的新的超精细常数。我们发现，添加红外激光器以驱动$ 1 \， - \; 0 $振动转换$ \ mathrm {x}^2σ^+$歧管加速了冷却过程。结果表明，在最佳条件下，在68 $ \mathrmμ$ S（330 ms）（330毫秒）和25毫秒（1.2 s）后（不含）红外线激光器后，Rovibronic地面歧管目标状态可以达到63 $ \％$。
We propose an optical pumping scheme to prepare trapped $\mathrm{AlH}^+$ molecules in a pure state, the stretched hyperfine state $\lvert F=\frac{7}{2},\, m_F=\frac{7}{2}\rangle$ of the rovibronic ground manifold $\lvert \mathrm{X}^2Σ^+,\, v=0,\, N=0\rangle$. Our scheme utilizes linearly-polarized and circularly-polarized fields of a broadband pulsed laser to cool the rotational degree of freedom and drive the population to the hyperfine state, respectively. We simulate the population dynamics by solving a representative system of rate equations that accounts for the laser fields, blackbody radiation, and spontaneous emission. In order to model the hyperfine structure, new hyperfine constants of the $\mathrm{A}^2Π$ excited state were computed using a RASSCF wavefunction. We find that adding an infrared laser to drive the $1 \,-\; 0$ vibrational transition within the $ \mathrm{X}^2Σ^+$ manifold accelerates the cooling process. The results show that under optimum conditions, the population in the target state of the rovibronic ground manifold can reach 63 $\%$ after 68 $\mathrmμ$s (330 ms) and 95 $\%$ after 25 ms (1.2 s) with (without) the infrared laser.
