2023/10/12 by L. T. Glöggler, Natali Gusakova, Glöggler, L. T. +101
Physics and Astronomy · #Atomic Physics (physics.atom-ph) #Atomic and Molecular Physics #Atomic and Subatomic Physics Research #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)
paper · pdf · doi:10.48550/arxiv.2310.08760
openalex publication_date 2023/10/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/03
We report on laser cooling of a large fraction of positronium (Ps) in free-flight by strongly saturating the 13S-23P transition with a broadband, long-pulsed 243 nm alexandrite laser. The ground state Ps cloud is produced in a magnetic and electric field-free environment. We observe two different laser-induced effects. The first effect is an increase in the number of atoms in the ground state after the time Ps has spent in the long-lived 33P states. The second effect is the one-dimensional Doppler cooling of Ps, reducing the cloud's temperature from 380(20) K to 170(20) K. We demonstrate a 58(9) % increase in the coldest fraction of the Ps ensemble.