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Protocol for Optically Pumping AlH$^+$ to a Pure Quantum State by Huang, Panpan; Kain, Schuyler; de Oliveira-Filho, Antonio; Odom, Brian C. is a scholarly article available to read on EtoBox.

What is Protocol for Optically Pumping AlH$^+$ to a Pure Quantum State about?

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 $\lvert \mathrm{X}^2\Sigma^+,\, v=0,\, N=0\rangle$. 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 $\mathrm{A}^2\Pi$ 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}^2\Sigma^+$ 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 $\mathrm{\mu}$s (330 ms) and 95 $\%$ after 25 ms (1.2 s) with (without) the infrared laser.

Author

Huang, Panpan; Kain, Schuyler; de Oliveira-Filho, Antonio; Odom, Brian C.

Published

2020

Language

EN