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Chemical Physics Letters

Direct laser cooling scheme for the CsH molecule based on electric field controlment

Niu-Zao Yan, Chuan‐Lu Yang, Meishan Wang, Xiao‐Guang Ma

Published Apr 5, 2023• 0 citations
Publisher
DOI
10.1016/j.cplett.2023.140495

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Abstract A method for manipulating molecules without suitable electronic properties to be viable candidates for laser cooling is described. Only a few natural molecules have a highly diagonal Franck–Condon factor (FCF) for the laser cooling scheme. Thus, we manipulate the FCFs by using an electric field identified by an optimized method based on linear regression. The details and the validity of the method are demonstrated using the CsH molecule. The different angles between the electric field and the molecular axis are considered, and the potential energy surfaces dependent on the electric field and angle are constructed. The vibrational energies and FCFs dependent on the angles are obtained, and the corresponding laser cooling schemes relative to the angles are built, which induce the accumulated FCFs of each scheme to exceed 0.999. The schemes can exert work at the angle between the molecular axis and the electric field is 1080° with five pumping lasers with center wavelengths of 473.74, 499.58, 527.72, 540.22, and 571.62 nm. In principle, the present method can be extended to any diatomic molecules without highly diagonal FCFs under natural conditions, providing a theoretical basis for studying physical and chemical problems involving cold molecules.
The electronic energy level structure of yttrium monoxide (YO) provides a long-lived, low-lying 2 Δ state ideal for high-precision molecular spectroscopy, narrowline laser cooling at the single photon-recoil limit, and studying dipolar physics with unprecedented interaction strength. High-resolution laser spectroscopy of ultracold laser-cooled YO molecules is used to study the Stark effect in the A ′ 2 Δ 3 / 2 J = 3 / 2 state. An immediate onset of the linear Stark effect is observed in the presence of weak applied electric fields due to the near-degenerate Λ doublet and the large electric dipole moment. By applying a small electric field the Stark-insensitive state is spectroscopically isolated and the absolute transition frequency to the X 2 Σ + electronic ground state is determined with a fractional frequency uncertainty of 9 × 10 − 12 . This electric field control is necessary to implement a quasi-closed photon-cycling scheme that preserves parity. With this scheme the first narrowline laser cooling of a molecule is demonstrated, reducing the temperature of sub-Doppler cooled YO in two dimensions.
Laser cooling typically requires one or more repump lasers to clear dark states and enable recycling transitions. Here, we have achieved cooling of Be+ ions using a single laser beam, facilitated by one-dimensional heating through micromotion. By manipulating the displacement from the trap's nodal line, we precisely controlled the ion micromotion direction and speed, reaching up to 3144 m/s, which corresponds to a 7.1 GHz Doppler frequency shift in our experiment. This approach eliminates the necessity of a 1.25 GHz offset repump laser while keeping the Be+ ions cold in the perpendicular direction. Measurements were taken using cooling laser detuning and imaging of ion trajectories. Molecular dynamics simulations, based on machine learned time-dependent electric field E(X, Y, Z, t) inside the trap, accurately reproduced the experimental observation, illuminating the relationship between the direction of micromotion and the trapping electric filed vector. This work not only provides a robust method for managing the micromotion velocity of ions but also sheds light on laser cooling complex systems that require multiple repumping lasers. Additionally, it offers a method for controlling energy in the context of ion-molecule collision investigations.