Single-Beam Magneto-Optical Trap in Back-to-Back Pyramidal and Conical Mirrors
Abstract
A three-dimensional magneto-optical trap (MOT), as an efficient method of producing cold atoms from room-temperature atomic vapor, has been widely used to develop atomic sensors. Various compact MOTs using a single laser beam have been reported, simplifying apparatuses and leading to miniaturized devices. Here, we propose single-beam MOTs based on back-to-back pyramidal and conical mirrors. In such back-to-back mirrors, a MOT trapping volume is formed by an incident laser beam, a retroreflected beam, and multiple reflections from the mirror surfaces. We present the design of back-to-back mirrors and a series of compact MOT configurations, with the potential of increasing access to the MOT and simultaneously creating multiple MOTs. We demonstrate a MOT in a back-to-back conical mirror, loading 10 million rubidium-87 atoms from background vapor and cooling the atoms to 7 {\mu}K using polarization gradients. Single-beam MOTs based on back-to-back mirrors will contribute to building compact and scalable cold-atom-based sensors.
Cite
@article{arxiv.2507.07925,
title = {Single-Beam Magneto-Optical Trap in Back-to-Back Pyramidal and Conical Mirrors},
author = {Timothy H. Nguyen and Mariam Mchedlidze and Guanghui Su and Balthazar Loglia and Hanbo Yang and Xuejian Wu},
journal= {arXiv preprint arXiv:2507.07925},
year = {2025}
}
Comments
12 pages, 7 figures