# Laser cooling with adiabatic passage for diatomic molecules

## TL;DR

This paper introduces a magnetically enhanced laser cooling scheme using adiabatic passage for diatomic molecules, significantly improving cooling force and velocity range, and reducing spontaneous emission dependence, making molecular laser cooling more feasible.

## Contribution

The paper proposes a novel laser cooling method employing magnetic fields and adiabatic transfer to enhance cooling efficiency in complex molecules.

## Key findings

- Achieves approximately 4 times larger maximum cooling force.
- Provides a wider velocity range for effective cooling.
- Reduces dependence on spontaneous emission, enabling cooling of molecules with leakage channels.

## Abstract

We present a magnetically enhanced laser cooling scheme applicable to multi-level type-II transitions and further diatomic molecules with adiabatic transfer. An angled magnetic field is introduced to not only remix the dark states, but also decompose the multi-level system into several two-level sub-systems in time-ordering, hence allowing multiple photon momentum transfer. For complex multi-level diatomic molecules, although the enhancement gets weakened, our simulations still predict a $\sim 4\times$ larger value of the maximum achievable cooling force and a wider coolable velocity range compared to the conventional Doppler cooling. A reduced dependence on spontaneous emission of this scheme makes laser cooling a molecule with leakage channels become a feasibility.